Figure 1 ISDN Point-to-Point Configuration
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:
Telephone carriers cannot guarantee the successful transmission of data over voice grade lines.
At the present time, DOSBS can only be used with US switch variants.
Voice_data
Your router initiates a Voice call to the specified destination. If the Voice call fails completely, your router then tries the call again using Data.
Voice_only
Your router initiates a Voice call. If the Voice call fails, your router does not attempt to place a Data call. The call fails.
Note: This is the default option when DOSBS is enabled.
Data_only
Your router initiates a Data call and tries to establish a 64 Kbps UDI link.
Note: This is the default option when DOSBS is disabled.
POTS
Plain Old Telephone Service (POTS) is an extension of the ISDN functionality that is currently supported in your GTX 1000 router. It allows analog telephone equipment, such as telephones, FAX machines, and modems, to be directly connected to your OpenROUTE Networks GTX 1000 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 1000, you can now use your ISDN connection for voice and data connections from a single platform.
Notes:
DOSBS is disabled in order to use analog equipment through POTS.
For ISDN with POTS capability, you need to install either an ISDN U with POTS module or an ISDN S/T with POTS module in slot 3 (MD3) on a GTX 1000.
OpenROUTE software supports ISDN with POTS on the USNI1, 5ESS, DMS-100, NET3, VN4, and INS64 switch variants.
Figure 1 ISDN Point-to-Point Configuration
Figure 2 ISDN Multipoint Configuration
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. OpenROUTE Networks routers support these switch variants.
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.Boot the router over an ISDN interface.
Use the D channel for data traffic. The ISDN interface uses the D channel only for setting up and taking down B channel connections.
Use X.25 connectivity on the B channels.
Telephone number(s) of the local ISDN interface.
Destination telephone numbers, including any telephone extensions.
Type of switch to which the ISDN interface is connected. See Table 1 for a list of switches that OpenROUTE Networks routers support.
The TEI (Terminal Endpoint Identifier) that your service provider assigns. For some North American switches, the service provider may assign a TEI for each B channel.
Whether or not your service provider requires Service Profile IDs (SPIDs). SPIDs are used only in North America. If the router uses both
B channels, you need a SPID for each B channel.
Whether you are configured for point-to-point or multipoint.
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)
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>
Circuit Config <NET-3> bri
Basic Rate ISDN user configuration
BRI Config <ISDN>
Address name. Description of the address. You can use up to 23 printable ASCII characters. Address names are case sensitive.
Network address. Directory number of the local or destination port. You can enter up to 25 numbers, as well as six other characters, including spaces and punctuation. The router uses only the numbers.
Network subaddress. Optional. Additional part of the directory number, such as an extension, that gets interpreted once the interface connects to a PBX. You can enter up to 20 characters, as well as 11 additional spaces and punctuation. The router uses only the numbers.
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.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 delete all numbers for an address name that has multiple numbers, do not enter a network dial address when prompted.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] []? 24BRI 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
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
Circuit Config <NET-3> bri
Basic Rate ISDN user configuration
BRI Config <ISDN>
BRI Config <ISDN>set switch-variant
Switch-Variant-Model []? usni1
BRI Config <ISDN>set multipoint-selection
Multipoint Selection [MP]? pp
BRI Config <ISDN>set dn0
Enter DN0 (Directory-Number-0) [ ]?1-555-0983BRI Config <ISDN>set dn0
Enter DN0 (Directory-Number-0) [ ]?1-555-0983:22
The colon (:) separates the address number from the sub-address.
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
BRI Config <ISDN>set spid
Which SPID [1]? 1
Enter Service Profile ID (SPID) []? 50855589530101
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]? 10BRI Config <ISDN>set tei
Which TEI [0]? 1
TEI [AUTO]? 12
BRI Config <ISDN>set framesize
Framesize in bytes (1024/2048/4096) [2048]? 2048
BRI Config <ISDN>enable dosbs
Figure 5 ISDN Point-to-Point Configuration
Config>network 3
Circuit Configuration
Circuit Config <NET-3> bri
Basic Rate ISDN user configuration
BRI Config <ISDN>
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] []?
BRI Config <ISDN>set switch-variant
Switch-Variant-Model []? usni-1
BRI Config <ISDN>set dn0
Enter DN0 (Directory-Number-0) [ ]?5559876BRI Config <ISDN>set dn1
Enter DN1 (Directory-Number-1) [ ]?5554961
BRI Config <ISDN>set multipoint-selection
Multipoint Selection [MP]? pp
BRI Config <ISDN>set spid
Which SPID [1]? 0
Enter Service Profile ID (SPID) []? 508555987600BRI Config <ISDN>set spid
Which SPID [1]? 1
Enter Service Profile ID (SPID) []? 508555496100
BRI Config <ISDN>set tei
Which TEI [1]? 0
TEI [AUTO]?BRI Config <ISDN>set tei
Which TEI [1]? 1
TEI [AUTO]?
BRI Config <ISDN>set framesize
Framesize in bytes (1024/2048/4096) [1024]? 2048
Figure 6 ISDN Multipoint Configuration
Config>network 3
Circuit Configuration
Circuit Config <NET-3> bri
Basic Rate ISDN user configuration
BRI Config <ISDN>
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] []?
BRI Config <ISDN>set switch-variant
Switch-Variant-Model []? usni1
BRI Config <ISDN>set dn0
Enter DN0 (Directory-Number-0) [ ]?5559876
BRI Config <ISDN>set multipoint-selection
Multipoint Selection [MP]? mp
BRI Config <ISDN>set spid
Which SPID [1]? 0
Enter Service Profile ID (SPID) []? 508555987600
BRI Config <ISDN>set tei
Which TEI [1]? 0
TEI [AUTO]?BRI Config <ISDN>set tei
Which TEI [1]? 1
TEI [AUTO]? none
BRI Config <ISDN>set framesize
Framesize in bytes (1024/2048/4096) [1024]? 2048
+network 3
Circuit <NET-3>
Circuit <NET-3> bri
Basic Rate ISDN user console
BRI <ISDN>
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.
Accounting [M]
Displays the number of calls made, accepted, refused, and blocked for each destination.
Syntax: accounting
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
Add [C]
Adds accounting entries and addresses to the ISDN configuration.
Syntax: add
add accounting-entry
Assign accounting entry name []? newark
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
RemoteSite Address Calls: In Out Rfsd ElapsedTime
(unknown) 0 0 0 -
(unknown) 0 0 0 -
Unmapped connection indications: 0
circuits
B-channel State BearerType Reason Duration
- Idle - Down -
- Idle - Down -
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
delete accounting-entry
Remove accounting entry name []? newark
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 dosbs
enable dosbs
exit
list address
Address assigned name Network Address Network Subaddress
--------------------- --------------- ------------------
newark 123456789 1011121314
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 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.
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
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 country
POTS country profile [NA]?
Valid profiles are:
NA (North America)
UK (United Kingdom)
FRA (France)
GER (Germany)
EUR (Europe)
JAP (Japan)
CUST (Custom)
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
set dn0
Enter DN0 (Directory-Number-0) [ ]? 1-555-1234
ISDN Config>set dn0
Enter DN0 (Directory-Number-0) [ ]?1-555-1234:45
set dn1
Enter DN1 (Directory-Number-1) [ ]? 1-555-2345
ISDN Config>set dn1
Enter DN1 (Directory-Number-1) [ ]?1-555-2345:47
set framesize
Framesize in bytes (1024/2048/4096) [1024]? 2048
set multipoint-selection
Multipoint Selection [PP]?
set preferred
Preferred_Voice_Mode?SPEECH or 3_1KH
set spid
Which SPID [0]? 1
Enter Service Profile ID (SPID) []? 508555123400
Note: As of October 18, 1996, VN3 is obsolete in Europe. It has been succeeded by VN4.
Example:set switch net3
set tei
Which TEI ? [0]? 1
TEI [NONE]?
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