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Using the ISDN Interface

This document describes the Integrated Services Digital Network (ISDN) interface. It includes the following topics:

ISDN Overview

ISDN Hardware Configurations

Before You Begin

Displaying the ISDN Configuration Prompt

Configuration Procedures

Configuring Point-to-Point ISDN

Configuring Multipoint ISDN

Displaying the ISDN Monitoring Prompt

ISDN Commands

ISDN Overview

 Integrated Services Digital Network (ISDN) is a switched digital technology that upgrades an ordinary analog telephone network to an all-digital, end-to-end network. Using ISDN, you can transmit all types of information, such as voice, data, and video. With ISDN, you no longer need to incur the expense of leasing an all-digital line to receive the high-speed benefits of digital technology.

The ISDN interface software allows you to interconnect routers over ISDN. You can set up the interface to act over a dedicated link or to initiate and accept switched-circuit connections, either on demand, automatically from restart, or on command by the operator.

BRI Interface

The ISDN interface is a Basic Rate Interface (BRI) with two 64 Kbps (kilobits per second) bearer (B) channels and one 16 Kbps data (D) channel. The interface uses the B channels for data transmission. It uses the D channel to set up calls.

The BRI interface establishes connections with a peer router over an ISDN connection. It accepts or initiates connections on command from dial circuits. Once the ISDN interface establishes a connection, it transparently passes data to and from the dial circuit.

Some switches in North America do not provide 64 Kbps service for ISDN data calls; instead, they offer only 56 Kbps service. In this case, the ISDN software automatically falls back to 56 Kbps.

Addressing

To place a call, you specify the name and directory numbers of the destination. To identify yourself to the destination, you specify your own directory number. For ISDN, directory numbers are called network dial addresses, and, for convenience, you give destinations names called network address names that represent the directory number.

You can add multiple numbers for each destination name. If you are using two ISDN directory numbers, you need to add both numbers for the same network address name.

If you define multiple numbers for a destination network dial address, the dial circuit attempts to call the first number. If the dial circuit is not able to complete the connection, it cycles through all of the defined numbers until it establishes the connection.

Cost Control Over Demand Circuits

Dial-on-demand circuits always appear to be in the Up state to routing protocols. Most protocols send out periodic routing information that can cause the router to dial out each time it sends routing information over dial-on-demand circuits. To limit periodic routing updates, configure IP to use only static routes and disable the routing protocol (RIP) over the dial circuits. Configure IPX for low-frequency updates or change updates so that the router sends broadcast messages at specified intervals, when there is data to send or if there is a problem. You should also enable IPX keepalive filtering, which prevents keepalive and serialization packets from continually activating a dial-on-demand link.

Caller ID

Some ISDN switch variants provide a feature called caller ID. Caller ID provides the telephone number of the calling router. The ISDN service uses this number to identify the name of the calling router.

DOSBS

Data Over Speech Bearer Service (DOSBS) is a method your router can use to place or receive 56K voice grade calls and then use the channels to pass data. Using DOSBS helps you to reduce your telephone bill because the cost for voice calls is generally lower than that for data calls. To use this ISDN feature, the ISDN line must be provisioned with voice on at least one B channel.

Notes:

Line Provisioning

 Your ISDN line provisioning must match at both the local and remote ends of the line. Otherwise, you cannot communicate over the B channel.

The available DOSBS modes are:

Leased Line

 OpenROUTE software provides ISDN leased line capability by supporting the JPNLSD switch variant. This switch variant is proprietary to Nippon Telephone and Telegraph (NTT). It allows you to work with NTT high speed digital leased line circuit services. Its leased line capability functions in the same way as any other leased line point-to-point link.

Note: Because this is leased line, some of the ISDN commands and command options are not available. For example, set multipoint-selection is not available.

Call-back

 The Call-back feature causes a local router to use an incoming call as a signal to call back a remote router. OpenROUTE software uses the Link Control Protocol (LCP) Callback option, as defined in RFC 1570, to control Call-back processing. Call-back is typically used with dial-on-demand.

The default is to have Call-back disabled. If the remote router requests Call-back and Call-back is disabled on the local router, the local router rejects the request.

On an ISDN interface, you can set up Call-back so that the local router does not answer the incoming call, and the remote router does not incur the expense of placing the call. This feature is referred to as D-channel Call-back.

For additional information, see Call-back Feature in Using PPP Interfaces.

POTS

Plain Old Telephone Service (POTS) is an extension of the ISDN functionality that is supported in your GTX Series router. It lets you connect analog telephone equipment, such as telephones, FAX machines, and modems, directly to your GTX router. The telephone equipment contends for the available B-channels of the ISDN link along with traditional Point-to-Point Protocol (PPP) data links. With POTS on the GTX router, you can now use your ISDN connection for voice and data connections from a single platform.

Notes:

ISDN Hardware Configurations

 The following sections provide samples of different ISDN hardware configurations.

Point-to-Point and Multipoint Configurations

In Figure 1, both the GT 70 and Router 2 are in a point-to-point configuration, where there is one router on the ISDN line. In this case, the routers can use both B channels.

Figure 1 ISDN Point-to-Point Configuration

In Figure 2, the GT 70 is sharing the ISDN line with another ISDN device in a multipoint configuration. In this case, the GT 70 and the other ISDN device each has access to the B channels.

Figure 2 ISDN Multipoint Configuration

Note: In both Figure 1 and Figure 2, the GT 70 is the S/T model.

Frame Relay Over ISDN Configuration

 Figure 3 shows how you can connect to a Frame Relay network through an ISDN network. In this configuration, you set the data link on your dial circuit to Frame Relay.

Figure 3 Frame Relay Over ISDN Configuration

ISDN With POTS

Figure 4 illustrates how to connect a GTX 1000 with an ISDN with POTS module to an ISDN.

Figure 4 ISDN with POTS

Switches Supported

The telephone company's switch variant, or type of switch, determines the capabilities of your ISDN service. It is your primary connection into the ISDN network. The switch variant determines how many ISDN devices you can handle, as well as what different configuration options you can have. Some switch variants support eight different devices, others support only two devices. The switch also determines which B channels support voice, video, data, or both. Most telephone companies provide a switch variant from one of switch variants in Table 1. Nx Networks routers support these switch variants.

Table 1 ISDN Switch Variants Supported
Location If you want this switch standard . . . Set the software to . . .
North America United States National ISDN-1

United States National ISDN-2

AT&T 5ESS Custom

Northern Telecom DMS-100 Custom

USNI1

USNI2

5ESS

DMS-100

Europe European ETSI NET3, VN4

VN3 (See the Note below.)

 NET3

VN3

Japan INSNet64

JPNLSD

 INS64

JPNLSD-64 (for one B channel)

JPNLSD-128 (for two B channels)

Australia TS013

 AUS

Note: As of October, 1996, VN3 is obsolete in Europe.

When you call your telephone company, you must ask for the switch variant that they use. When you configure your router, you need to provide the switch variant.

ISDN Interface Restrictions

The following are some ISDN interface restrictions. You cannot

Before You Begin

 Before you configure ISDN, you need to have the following information:

Displaying the ISDN Configuration Prompt

 To display the BRI Config <ISDN> prompt

1. At the Config> prompt, enter list interfaces to display a list of interfaces. 

Config>list interfaces
Ifc   0, Ethernet/IEEE 802.3 (via device Ethernet)
Ifc   1, Point to Point (via device WAN1, with Dialer)
Ifc   2, Frame Relay (via device WAN2, with LAN Emulation)
Ifc   3, Point to Point (via device ISDN)
Ifc   4, Frame Relay (via device ISDN, with LAN Emulation)
2. At the Config> prompt, enter network followed by the number of one of the "via device ISDN" interfaces to display the Circuit Config <NET #> prompt. In this case, Ifc 3 or 4.

Note: It does not matter which "via device ISDN" interface number you enter.

Config>network
What is the network number [0]? 3
Circuit Configuration

Circuit Config <NET-3>
3. At the Circuit Config <NET-#> prompt, enter bri to display the
BRI Config <ISDN> prompt. 

Circuit Config <NET-3> bri
Basic Rate ISDN user configuration

BRI Config <ISDN>
You can configure all ISDN parameters from this prompt.

Configuration Procedures

This section describes how to configure your ISDN interface. The tasks you need to perform are

1. Adding ISDN addresses

2. Configuring ISDN parameters

Note: You must restart the router for any configuration changes to take effect.

Adding ISDN Addresses

 You need to add an ISDN address for each destination. The ISDN address includes

To add an ISDN address, enter add address at the BRI Config <NET-1> prompt. 

BRI Config <ISDN> add address
Assign address name [1-23] chars? baltimore
Assign network dial address [1-25 digits]? 1-555-0983
Assign network subaddress [0-20 digits]? 23
To see a list of your ISDN addresses, enter list address at the BRI Config <ISDN> prompt.

To delete an ISDN address from your list, enter delete address at the BRI Config <ISDN> prompt.

The software prompts you for the dial and subdial address to distinguish between the primary telephone number and the sub-addresses of different ISDN peripherals at that number.

Multiple Numbers for an ISDN Address

You can enter multiple telephone numbers for one address name. If your configuration uses two ISDN directory numbers, enter both numbers for the local ISDN address. You can also add multiple numbers for a destination. The dial circuit attempts to call each of the numbers until it successfully connects to the destination.

To add two numbers for one address name, repeat the command using the same address name.

BRI Config <ISDN> add address
Assign address name [1-23] chars []? baltimore
Assign network dial address [1-15 digits][]? 1-555-2657
Assign network subdial address [0-20 digits] []? 24
BRI Config <ISDN> add address
Assign address name [1-23] chars []? baltimore
Assign network dial address [1-15 digits][]? 1-555-8797
Assign network subdial address [0-20 digits] []? 25
To delete all numbers for an address name that has multiple numbers, do not enter a network dial address when prompted.

BRI Config <ISDN> del address
Delete address name [1-23] chars []? baltimore
Delete network dial address [1-15 digits][]? 
Really delete all addresses under this name?(Yes or [No]):yes

Configuring ISDN Parameters

 This section describes how to configure the ISDN parameters.

1. At the Config> prompt, enter network followed by the number of the ISDN interface that you want to configure to display the Circuit Config <NET #> prompt.

2. Enter bri to display the BRI Config <ISDN> prompt. 

Circuit Config <NET-3> bri
Basic Rate ISDN user configuration

BRI Config <ISDN>
3. Specify the type of switch to which you connected this ISDN interface. See Table 4 for a list of switch variants. 

BRI Config <ISDN>set switch-variant
Switch-Variant-Model []? usni1
4. Set the ISDN interface to either point-to-point (pp) or multipoint (mp). Some switches require you to configure the line as multipoint regardless of how many devices are on it. Check with your ISDN service provider. 

BRI Config <ISDN>set multipoint-selection
Multipoint Selection [MP]? pp
5. If you set the switch-variant to any type other than INS64, set the directory number of the local ISDN interface. Be sure that your address is unique. 

BRI Config <ISDN>set dn0
Enter DN0 (Directory-Number-0) [ ]?1-555-0983


BRI Config <ISDN>set dn0
Enter DN0 (Directory-Number-0) [ ]?1-555-0983:22

The colon (:) separates the address number from the sub-address.

6. If your service provider assigned a second directory number, set directory number one. ISDN lines that have two directory numbers can place or receive calls on either directory number. Therefore, you must configure both numbers or the interface may reject calls. 

BRI Config <ISDN>set dn1
Enter DN1 (Directory-Number-1) [ ]?1-555-2037

You can assign a sub-address for dn1 in the same way as for dn0. (See step 5.) 

BRI Config <ISDN>set dn1
Enter DN1 (Directory-Number-1) [ ]?1-555-2037:28
7. In North America, service providers may require Service Profile IDs (SPIDs). A SPID is a number that uniquely identifies a specific profile of service characteristics available on a particular access interface (such as a B channel). Your ISDN service provider assigns SPIDs. Generally, if your service provider assigns two directory numbers, they also assign two SPIDs. 

BRI Config <ISDN>set spid
Which SPID [1]? 1
Enter Service Profile ID (SPID) []? 50855589530101
8. Set the TEI (Terminal Endpoint Identifier) to match the signalling TEI number of your ISDN switch. Check with your service provider to find out what TEI signalling the switch supports. The default TEI is automatic. If the ISDN switch does not support automatic TEI signalling, set the TEI to the value that your service provider assigns.

If you are connected to a 5ESS, USNI1, or DMS100 switch, you may need to set a TEI for each B channel. When you enter set tei, the router prompts you for which TEI to configure. In a multipoint configuration, setting both TEIs allows the router to use both B channels and can prevent other ISDN devices on the multipoint bus from using a B channel. If you configure only one TEI, the router can use only one B channel, leaving the other B channel available for the other ISDN devices. 

BRI Config <ISDN>set tei
Which TEI [0]? 0
TEI [AUTO]? 10


BRI Config <ISDN>set tei
Which TEI [0]? 1
TEI [AUTO]? 12
9. Set the frame size so that it is greater than or equal to the frame size of the data link protocol (PPP) running on the link. The options are 1024, 2048, or 4096 bytes. The default is 2048. Nx Networks strongly recommends that you accept the default. 

BRI Config <ISDN>set framesize
Framesize in bytes (1024/2048/4096) [2048]? 2048
10. Enable DOSBS, if you want voice-grade connections for your data. 

BRI Config <ISDN>enable dosbs

Configuring Point-to-Point ISDN

 In an ISDN point-to-point configuration, your router must be the only ISDN device using both B channels. Figure 5 shows your local router with a point-to-point ISDN connection.

Figure 5 ISDN Point-to-Point Configuration

The following procedure assumes communication between your local router and two remote routers.

1. Display the BRI Config <ISDN> prompt. 

Config>network 3
Circuit Configuration

Circuit Config <NET-3> bri
Basic Rate ISDN user configuration

BRI Config <ISDN>
2. Add ISDN addresses for the two remote routers. 

BRI Config <ISDN>add address
Assign address name [1-23] chars []? Remote1
Assign network dial address [1-15 digits][]? 555-2389
Assign network subdial address [0-20 digits] []? 


BRI Config <ISDN>add address
Assign address name [1-23] chars []? Remote2
Assign network dial address [1-15 digits][]? 555-7925
Assign network subdial address [0-20 digits] []?
3. Set the type of switch connected to the ISDN interface. 

BRI Config <ISDN>set switch-variant
Switch-Variant-Model []? usni-1
4. Set directory number 0 (dn0) and directory number 1 (dn1). (Skip this step for the INS64 switch variant.) Use the network dial addresses assigned to you by the telephone company. 

BRI Config <ISDN>set dn0
Enter DN0 (Directory-Number-0) [ ]?5559876


BRI Config <ISDN>set dn1
Enter DN1 (Directory-Number-1) [ ]?5554961
5. Set the ISDN interface to point-to-point (pp). 

BRI Config <ISDN>set multipoint-selection
Multipoint Selection [MP]? pp
6. Enter the SPIDs the ISDN service provider assigned. 

BRI Config <ISDN>set spid
Which SPID [1]? 0
Enter Service Profile ID (SPID) []? 508555987600


BRI Config <ISDN>set spid
Which SPID [1]? 1
Enter Service Profile ID (SPID) []? 508555496100
7. Set the TEI to match the TEI signalling of the ISDN switch. 

BRI Config <ISDN>set tei
Which TEI [1]? 0
TEI [AUTO]?


BRI Config <ISDN>set tei
Which TEI [1]? 1
TEI [AUTO]?
8. Set the frame size. 

BRI Config <ISDN>set framesize
Framesize in bytes (1024/2048/4096) [1024]? 2048

Configuring Multipoint ISDN

 In an ISDN multipoint configuration, your router can share the ISDN connection with other ISDN devices. Because of this, configure your router to use only one B channel. Otherwise, the router could use both B channels and prevent the other ISDN device from accessing a B channel. To configure the router to use only one B channel, set it up to use only one TEI and, if applicable, one SPID.

Figure 6 shows YOUR local router with a multipoint ISDN connection. The local router can connect to two remote routers.

Figure 6 ISDN Multipoint Configuration

To configure an ISDN multipoint connection, do the following:

1. Display the BRI Config <ISDN> prompt. 

Config>network 3
Circuit Configuration

Circuit Config <NET-3> bri
Basic Rate ISDN user configuration

BRI Config <ISDN>
2. Add ISDN addresses for the two remote routers. 

BRI Config <ISDN>add address
Assign address name [1-23] chars []? Remote1
Assign network dial address [1-15 digits][]? 555-2389
Assign network subdial address [0-20 digits] []? 


BRI Config <ISDN>add address
Assign address name [1-23] chars []? Remote2
Assign network dial address [1-15 digits][]? 555-7925
Assign network subdial address [0-20 digits] []?
3. Set the type of switch variant connected to the ISDN interface. 

BRI Config <ISDN>set switch-variant
Switch-Variant-Model []? usni1
4. If needed by the switch variant, set directory number 0 (dn0) of the local port that was assigned by the telephone company. 

BRI Config <ISDN>set dn0
Enter DN0 (Directory-Number-0) [ ]?5559876
5. Set the ISDN interface to multipoint (mp). 

BRI Config <ISDN>set multipoint-selection
Multipoint Selection [MP]? mp
6. If needed by the switch variant, enter one of the SPIDs the ISDN service provider assigned. 

BRI Config <ISDN>set spid
Which SPID [1]? 0
Enter Service Profile ID (SPID) []? 508555987600
7. Set the TEI to match the TEI signalling of the ISDN switch variant. If the switch to which you are connected uses two TEIs, the software prompts you for which TEI to set (0 or 1). Because this is a multipoint configuration, set TEI 1 to none so that the router does not use both B channels. 

BRI Config <ISDN>set tei
Which TEI [1]? 0
TEI [AUTO]?


BRI Config <ISDN>set tei
Which TEI [1]? 1
TEI [AUTO]? none
8. Set the frame size. 

BRI Config <ISDN>set framesize
Framesize in bytes (1024/2048/4096) [1024]? 2048

Displaying the ISDN Monitoring Prompt

 To display the ISDN monitoring prompt

1. At the Monitor> prompt, enter network followed by the number of one of the ISDN interfaces. (You can identify the ISDN interfaces by entering list interfaces at the Config> prompt.) 

Monitor>network 3

Circuit <NET-3>
2. Enter bri. 

Circuit <NET-3> bri
Basic Rate ISDN user console

BRI <ISDN>

ISDN Commands

Table 2 summarizes the ISDN commands.

Not all parameters apply to all router platforms. Press Space twice after you type a command to display the available parameters for each command. Enter help for information about using the command line interface.

[C] means the command is available at the BRI Config <ISDN> prompt.

[M] means the command is available at the BRI <ISDN> prompt.

Table 2 ISDN Commands

Command Function
Accounting [M] Displays a history for each accounting entry: calls placed to and from the entry, the number of calls that were refused and blocked, and the channel uptime for outbound calls.

Add [C] Adds accounting entries and addresses to the ISDN configuration.

Calls [M] Displays the name of the remote site, the number of calls made per channel, whether the calls were incoming or outgoing, the number that were refused, and the time the channel has been up.

Circuits [M] Shows the status of all data circuits configured on the ISDN interface.

Conf_test_ cmds [M] Do not use these commands. They are for use in a development environment only. They can disable the ISDN interface, requiring a router reset.

Delete [C] Removes accounting entries and addresses from the ISDN configuration.

Disable [C] Disables Data Over Speech Bearer (DOSBS) mode.

Enable [C] Enables Data Over Speech Bearer (DOSBS) mode.

Exit [C] [M] Returns to the previous prompt.

List [C] Displays the ISDN addresses and configuration parameters.

Parameters [M] Displays the current parameters for the ISDN interface.

Set [C] Sets the POTS country profile (if router has a POTS module), frame size, local address, physical bus to either point-to-point or multipoint, SPIDs, no answer timeouts, number of retries after no answer, type of ISDN switch, directory numbers, and TEI.

Statistics [M] Displays the current statistics for the ISDN interface.

Accounting [M]

Displays the number of calls made, accepted, refused, and blocked for each destination.

Syntax: accounting

Example: accounting

 AccountingName     Address       Total:  In   Out   Rfsd   Outb_UpTime 
 gt70-43            98983500               0    0      0      0:00:00 
 gt70-44            98983600               0    0      0      0:00:00 
 ----------------------------------------------------------------------
 (unknown)             -                   0    -      0         -  
 Total Blocked Calls:                           0
In

 Inbound connections accepted for this dial circuit.

Out

 Completed connections initiated by this dial circuit.

Rfsd

 Connections initiated by this dial circuit and refused by the network or the remote destination port.

Outb_UpTime

 Accumulated channel uptime for all outbound calls to this address.

Total Blocked Calls

 Connection attempts blocked. The router blocks connection attempts if the local port is already in use or it reaches the maximum number of retries to a non-responding address.

Add [C]

Adds accounting entries and addresses to the ISDN configuration.

Syntax: add

accounting-entry
address

accounting-entry

Adds an address name to the list of addresses for which the router maintains accounting information. You can use accounting entries to track the number of calls made, accepted, refused, and blocked for each destination as well as the accumulated time for all outbound calls to each destination. The ISDN interface maintains accounting information for outbound calls only. Use the accounting command at the BRI monitoring prompt to display accounting information.

You can add up to eight entries for each ISDN interface.

Note: The accounting entry name must match one of the ISDN addresses you entered using the add address command.

Example: add accounting-entry

Assign accounting entry name []? newark

address

Assigns a name to an ISDN address. Use these names, not the addresses, when you set destination addresses at the circuit configuration prompt.

It is important to add at least one ISDN address. This is the ISDN number of the remote router or server to which your router connects across ISDN. If the remote system has multiple numbers, then you must add each by using the add address command several times.

Example: add address

Assign address name [1-23] chars []? newark
Assign network dial address [1-25 digits] []? 123456789
Assign network subaddress [0-20 digits] []? 1011121314

Calls [M]

Displays the calls to and from each remote site, the calls that were refused or blocked, and the time the channel has been up.

Syntax: calls

Example: calls

 RemoteSite        Address         Calls:  In   Out  Rfsd  ElapsedTime
 (unknown)                                  0    0     0        -
 (unknown)                                  0    0     0        -

Unmapped connection indications:            0

Circuits [M]

 Lists statistics about calls currently in progress.

Syntax: circuits

Example: circuits

  B-channel     State          BearerType        Reason      Duration
      -         Idle               -               Down         -
      -         Idle               -               Down         -
State

 Current state of the dial circuit:

Idle— B channel cannot be used or assigned.
Call— Call in progress.
Call-Rxd— Call received.
Data Xfer— Data being transmitted.
Bearer Type

 The actual Bearer Service, such as: UDI, Speech, or 3.1 KHZ Audio. See DOSBS.

Reason

 Reason for the current state:

Up— Currently connected using the B channel indicated.
Down— Failed to connect because of a busy dial circuit or because the data link protocol is down.
Connecting— Channel in process of making a call.
Duration

 Length of time the channel has been up since restart of the router.

Conf_test_ cmds [M]

Invokes a submenu, where various commands can be issued to the router for conformance test purposes.

CAUTION:
These commands should never be used. Using these commands during normal router operation can cause erratic behavior of the ISDN interface, requiring the router to be reset.

Delete [C]

Removes accounting entries and addresses from the ISDN configuration.

Syntax: delete

accounting-entry
address

accounting-entry

Removes an address name from the list of addresses for which accounting information is maintained.

Example: delete accounting-entry

Remove accounting entry name []? newark

address

Removes an ISDN address from the directory.

The software prompts you for the dial and subdial address to distinguish between the primary telephone number and the sub-addresses of different ISDN peripherals at that number.

Note: If you want to delete all numbers for an address name that has multiple numbers, do not enter a network dial address when prompted.

Example: delete address

Delete address name [1-23] chars []? newark
Delete network dial address [1-25 digits] []? 1-508-366-2345
Delete network subdial address [0-20 digits] []? 22

Disable [C]

 Disables Data Over Speech Bearer Service (DOSBS) for all destination ISDN addresses or for an individual destination or phone number. This command sets the mode to Data_only.

Syntax: disable dosbs destination name destination phone #

Example: disable dosbs

Enable [C]

Sets Data Over Speech Bearer Service (DOSBS) for all destination ISDN addresses to the default option of Voice_only or sets DOSBS for a paricular destination or phone number to a particular DOSBS mode.

Syntax: enable dosbs dest name dest phone # DOSBS mode

Example: enable dosbs

Exit [C] [M]

Returns to the previous prompt.

Syntax: exit

Example: exit

List [C]

Displays the current ISDN configuration.

Syntax: list

address
parameters

address

Lists all of the ISDN telephone numbers in the phone directory.

Example: list address

Address assigned name           Network Address    Network Subaddress
---------------------           ---------------    ------------------
newark                          123456789                  1011121314

parameters

Lists the current configuration of the ISDN device. The configuration parameters listed vary depending on the switch variant selected.

Note: POTS parameters are displayed only for those platforms that have POTS hardware installed.

Example: list parameters

                  Basic Rate ISDN Configuration

Switch Variant                           = NT DMS-100
Multipoint Selection                     = Point-to-Point
DN0 (Directory Number 0)                 = 5559873
DN1 (Directory Number 1)                 = 5552845
SPID0 (Service Profile ID 0)             = 508555987300
SPID1 (Service Profile ID 1)             = 508555284500
TEI0                                     = Automatic
TEI1                                     = Automatic
Maximum frame size (bytes)               = 2048
Data Over Speech Bearer Service (DOSBS)  = Disabled
POTS country profile                     = United Kingdom
No circuit address accounting information being kept.
The following table provides the standard settings for various countries.

Table 3 Standard Parameters
Country Line Impedance Ringer Frequency Ringer Cadence Pattern
North America

 600 ohm

 20 Hz

 2 sec on/4 sec off

United Kingdom

 TBR21

 25 HZ

 0.4 sec on/0.2 sec off/0.4 sec on/2 sec off

France

 600 ohm

 50 Hz

 1.5 sec on/3.5 sec off

Germany

 TBR21

 25 Hz

 1 sec on/5 sec off

Europe

 600 ohm

 25 Hz

 1 sec on/4 sec off

Japan

 600 ohm

 16 Hz

 2 sec on/4 sec off

The following output displays parameters with the country profile set to custom.

Example: list parameters

              Basic Rate ISDN Configuration

Switch Variant                           = NT DMS-100
Multipoint Selection                     = Point-to-Point
DN0 (Directory Number 0)                 = 5559873
DN1 (Directory Number 1)                 = 5552845
SPID0 (Service Profile ID 0)             = 508555987300
SPID1 (Service Profile ID 1)             = 508555284500
TEI0                                     = Automatic
TEI1                                     = Automatic
Maximum frame size (bytes)               = 2048
Data Over Speech Bearer Service (DOSBS)  = Disabled
POTS country profile                     = Custom
POTS line impedance                      = 600 ohm
POTS ringer frequency (Hz)               = 25
POTS port 1 ringer cadence               = United Kingdom
POTS port 2 ringer cadence               = France
No circuit address accounting information being kept.
Note: If you want to use a particular country's standard configuration for ringer cadence, just enter the name of the country as listed in the table in Example 1.

Parameters [M]

Displays current run-time configuration parameters of the ISDN interface.

Syntax: parameters

Example: parameters

                    Basic Rate ISDN Port Parameters:

 Switch Variant                            = US National ISDN-1
 Multipoint Selection                      = Point-to-Point
 DN0 (Directory Number 0)                  = 15551212
 DN1 (Directory Number 1)                  =
 SPID0  (Service Profile ID 0)             =
 SPID1  (Service Profile ID 1)             = 56789
 TEI0                                      = Automatic
 TEI1                                      = Automatic
 Maximum Frame Size                        = 2048
 Data Over Speech Bearer Service (DOSBS)   = Disabled
 POTS country profile                      = United Kingdom
Parameter display with POTS country profile set to custom.

Basic Rate ISDN Port Parameters:

 Switch Variant                            = US National ISDN-1
 Multipoint Selection                      = Point-to-Point
 DN0 (Directory Number 0)                  = 15551212
 DN1 (Directory Number 1)                  =
 SPID0  (Service Profile ID 0)             =
 SPID1  (Service Profile ID 1)             = 56789
 TEI0                                      = Automatic
 TEI1                                      = Automatic
 Maximum Frame Size                        = 2048
 Data Over Speech Bearer Service (DOSBS)   = Disabled
 POTS country profile                      = Custom
 POTS line impedance                       = 600 ohm
 POTS ringer frequency (Hz)                = 25
 POTS port 1 ringer cadence                = United Kingdom
 POTS port 2 ringer cadence                = France
 No circuit address accounting information being kept.

Set [C]

Sets standard POTS parameters per country, directory numbers, frame size, multipoint selection, SPIDs, switch variants, preferred voice mode, and TEI.

Syntax: set

country
dn0
dn1
framesize
multipoint
preferred
spid
switch
tei

country

 Sets the POTS default standards for line impedance, ringer frequency, and ringer cadence parameters by entering the country name.

Note: You can also customize your settings for these parameters.

Example: set country

POTS country profile [NA]?


Valid profiles are:
NA (North America)
UK (United Kingdom)
FRA (France)
GER (Germany)
EUR (Europe)
JAP (Japan)
CUST (Custom)
Example: set country cust

POTS line impedance [TBR21]? 600
POTS ringer frequency in hertz [20]? 25
POTS port 1 ringer cadence pattern [NA]? uk
POTS port 2 ringer cadence pattern [NA]? fra

dn0 network dial address

If you set the switch-variant to any switch other than INS64, set the directory number of the local port.

Example: set dn0

Enter DN0 (Directory-Number-0) [ ]? 1-555-1234
If your router shares an ISDN S/T bus, you must also specify the extension (that is, the sub-address) assigned to your router.

ISDN Config>set dn0
Enter DN0 (Directory-Number-0) [ ]?1-555-1234:45
The colon (:) separates the primary number from the sub-address.

dn1 network dial address

Directory number 1 (dn1) is a second directory number. INS64 switches do not support a second directory number.

If your service provider assigned a second directory number, set dn1. ISDN lines that have two directory numbers can place or receive calls on either directory number. Therefore, you must configure both numbers or the interface may reject calls.

Example: set dn1

Enter DN1 (Directory-Number-1) [ ]? 1-555-2345
You can assign a sub-address for dn1 in the same way as for dn0.

ISDN Config>set dn1
Enter DN1 (Directory-Number-1) [ ]?1-555-2345:47

framesize 1024 or 2048 or 4096

Sets the maximum size of frames transferred over the ISDN interface. Does not include data link and MAC layer headers.

Example: set framesize

Framesize in bytes (1024/2048/4096) [1024]? 2048

multipoint mp or pp

Sets the configuration of the ISDN physical bus to either a Point-to-Point (PP) or a Multipoint (MP) configuration. A Point-to-Point configuration is typically defined as one ISDN device on an ISDN line, whereas a Multipoint configuration is defined as two or more ISDN devices sharing an ISDN line. With some switch variants, however, a line is configured as Multipoint, regardless of how many Terminal Endpoints (TEs) are on it. ISDN service providers dictate whether you have the option of configuring the lines for either PP or MP, or whether the lines must be set one way or the other.

Example: set multipoint-selection

Multipoint Selection [PP]?

preferred

 Sets preferred voice mode for DOSBS to either speech or 3.1KHz. Your selection depends on which mode your ISDN provider and ISP support.

Select 3.1KHz if both your ISDN provider and ISP support it. It is the safter mode to use because it does not confuse your calls with real voice ISDN calls. If either your ISDN provider or your ISP does not support 3.1KHz, you must select speech.

Example: set preferred

Preferred_Voice_Mode?SPEECH or 3_1KH

spid spid# spid-value

Sets the Service Profile IDs (SPIDs). In North America, ISDN service providers assign SPIDs to identify a particular ISDN device. A SPID is a number up to 20 digits long (typically, 10, 12, or 16 digits). SPIDs are used predominantly in a multipoint bus configuration, where multiple ISDN devices share a single ISDN line. However, they can be used in a point-to-point configuration as well.

Check with your ISDN service provider to determine whether or not your provider requires you to use a SPID. If you are using two directory numbers, you need to configure two SPIDs, 0 and 1.

Example: set spid

Which SPID [0]? 1
Enter Service Profile ID (SPID) []? 508555123400

switch 5ess, dms100, net3, ins64, usni1, usni2, vn3, aus, or jpnlsd

 Selects the switch variant.

The ISDN interface supports the switch variants listed in Table 4.

Table 4 ISDN Switch Variants Supported
Location If you want this switch standard . . . Set the software to . . .
North America United States National ISDN-1

United States National ISDN-2

AT&T 5ESS Custom

Northern Telecom DMS-100 Custom

USNI1

USNI2

5ESS

DMS-100

Europe European ETSI NET3, VN4

VN3 (See the Note below.)

 NET3

VN3

Japan INSNet64

JPNLSD

 INS64

JPNLSD

Australia TS013

 AUS

Note: As of October 18, 1996, VN3 is obsolete in Europe. It has been succeeded by VN4.

Example: set switch net3

tei auto or value or none

Sets the signalling TEI (terminal endpoint identifier) for the ISDN interface. This setting must match the signalling TEI of your switch. Check with your service provider for the correct TEI value.

Valid values are 0 through 63, Auto, or None. The default is Auto. The software lets you set a TEI for each B channel for switch variants that require this capability.

For ISDN lines that use a single TEI, setting the TEI to None disables the ISDN interface. For ISDN lines that use multiple TEIs, setting one of the TEIs to None prevents the interface from accessing one B channel.

5ESS, DMS100, and USNI1 switches require that you set the TEI for each B channel (TEI 0 or TEI 1). If you set the switch variant to one of those switches, entering set tei prompts you for which TEI to configure. In a multipoint configuration, you should set TEI 1 to None. Otherwise, the router could allocate both B channels and prevent other ISDN devices on the multipoint bus from accessing a B channel.

Example: set tei

Which TEI ? [0]? 1
TEI  [NONE]?

Statistics [M]

 Displays the current statistics for the ISDN device.

Syntax: statistics

Example: statistics

  Link: Inactive    BRI Firmware:   0.0    Handler State: Installed


                   	D Channel     B1 Channel     B2 Channel

Total Transmits            0              0              0
Total Receives             0              0              0
Transmit Bytes             0              0              0
Receive Bytes              0              0              0
Invalid Interrupts         0              0              0

Transmit:   D       B1       B2    Receive:        D       B1       B2
  
Error       0        0        0    Error           0        0        0
Overflow    0        0        0    Overflow        0        0        0
Underrun    0        0        0    Overrun         0        0        0
Abort       0        0        0    Abort           0        0        0
                                   CRC Error       0        0        0

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