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Chapter 13

Configuring ISDN Interfaces

This chapter describes how to configure an ISDN interface on a GlobeTrotter 70 or 72. It includes the following topics:

Before You Begin

Displaying the ISDN Configuration Prompt

Configuration Procedures

Configuring Point-to-Point ISDN

Configuring Multipoint ISDN

ISDN Configuration Commands

Before You Begin

 Before you configure ISDN, you need the following information:

For extensive information on all of these items, refer to the GlobeTrotter 70 and 72 Getting Started Guide.

Displaying the ISDN Configuration Prompt

To display the ISDN Config> prompt

1. Enter list interfaces at the Config> prompt to display a list of interfaces. 

Config>list interfaces
Ifc   0, Ethernet/IEEE 802.3
Ifc   1, Point to Point
2. Enter network followed by the number of the Point-to-Point interface you want to configure. 

Config>network 1
Circuit User Configuration
Circuit Config>
3. Enter isdn. 

Circuit Config>isdn
ISDN user configuration
ISDN Config>

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 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 ISDN Config> prompt. 

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

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

You are prompted 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. 

ISDN Config>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
ISDN Config>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.

ISDN Config>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. Enter network followed by the interface number of the ISDN interface. You can enter list interfaces at the Config> prompt to see a list of configured interface numbers. 

Config>network 1
Circuit user configuration
Circuit Config>
2. Enter isdn. 

Circuit Config>isdn
ISDN user configuration
ISDN Config>
3. Specify the type of switch to which you connected this ISDN interface. The options are 5ESS, DMS100, USNI1, USNI2, NET3, INS64, VN3, or AUS. 

ISDN Config>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. 

ISDN Config>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 port. 

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

If your GlobeTrotter 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) [ ]?1-555-0983:22

The colon (:) separates the primary 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. 

ISDN Config>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.)
ISDN Config>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. 

ISDN Config>set spid
Which SPID [1]? 1
Enter Service Profile ID (SPID) []? 5085558953
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. 

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

ISDN Config>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. Proteon strongly recommends that you accept the default. 

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

Configuring Point-to-Point ISDN

 In an ISDN point-to-point configuration, your GlobeTrotter is the only ISDN device using both B channels.

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

To configure an ISDN point-to-point connection, do the following:

1. Display the ISDN Config> prompt for interface 1. 

Config>network 1
Circuit user configuration
Circuit Config>isdn
ISDN user configuration
ISDN Config>
2. Add ISDN addresses for the two remote routers. 

ISDN Config>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] []? 

ISDN Config>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. 

ISDN Config>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. 

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

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

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

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

ISDN Config>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. 

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

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

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

Configuring Multipoint ISDN

 In an ISDN multipoint configuration (often referred to as split-B channel), your GlobeTrotter can share the ISDN connection with other ISDN devices. Because of this, configure your GlobeTrotter 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.

To configure an ISDN multipoint connection, do the following:

1. Display the ISDN Config> prompt for interface 1. 

Config>network 1
Circuit user configuration
Circuit Config>isdn
ISDN user configuration
ISDN Config>
2. Add ISDN addresses for the two remote routers. 

ISDN Config>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] []? 

ISDN Config>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. 

ISDN Config>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. 

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

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

ISDN Config>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. 

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

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

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

ISDN Configuration Commands

Table 13-1 summarizes and defines the ISDN configuration commands. Enter these commands at the ISDN Config> prompt.

Table 13-1 ISDN Configuration Commands
Command Function
? (Help) Lists available commands or the options for a particular command.
Add Adds accounting entries and addresses to the ISDN configuration.
Del Removes accounting entries and addresses from the ISDN configuration.
List Displays the ISDN configuration.
Set Sets the 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.
Exit Returns to the Config> prompt.

? (Help)

Lists available commands or lists the command's options.

Syntax: ?

Example: set framesize ?

Framesize in bytes  [2048]?

Add

Adds accounting entries and addresses to the ISDN configuration.

Syntax: add

accounting-entry
address

accounting entry network address name

Adds an address name to the list of addresses for which accounting information is maintained. If your ISDN telephone service provides accounting information, you can use accounting entries to track telephone charges for specific network addresses. You can add up to eight entries for each ISDN interface. The accounting entry name must match one of the ISDN addresses you entered using add address at the ISDN Config> prompt.

Example: add acccounting-entry

Assign accounting entry name []? newark

address

Assigns a name to an ISDN address. These names, not the addresses, are used in the configuration of dial circuits.

It is important to add at least one ISDN address. This is the ISDN number of the remote router or server to which the GlobeTrotter must connect 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

Del

Removes accounting entries and adresses from the ISDN configuration.

Syntax: del

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. All numbers associated with that address are deleted.

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

List

 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, because not all parameters are applicable to a given switch variant.

Example: list parameters

                  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)           = 1024
No circuit address accounting information being kept.

Set

Configures directory numbers, frame size, addresses, multipoint selection, SPIDs, switch variants, and TEI.

Syntax: set

dn0 (directory number 0)
dn1 (directory number 1)
framesize
multipoint-selection
spid (service-profile-ID)
switch-variant
tei (terminal endpoint identifier)

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 GlobeTrotter 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-selection 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]?

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. The ISDN service provider can determine whether or not SPIDs are used and can also assign the values to be used.

Check with your 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-variant 5ess, dms100, net3, ins64, usni1, usni2, vn3, or aus

 Selects the switch variant.

The ISDN interface supports the following switch variants:

Example: set switch

Switch-Variant-Model  [USNI1]?

tei auto or value or none

 Sets the signalling TEI 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. Setting of TEIs per B channel is supported for switch variants that require this capability (currently only 5ESS, DMS100, and USNI1). The default is Auto.

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]?

Exit

Returns to the Circuit Config> prompt.

Syntax: exit

Example: exit


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