Software User's Guide Version 3.4

Using the V.34 Network Interface

The V.34 interface allows routers to establish serial connections over leased lines or over switched telephone lines using externally attached modems that support the standard AT command set or integrated modem adapters. This chapter describes how to use a V.34 interface. It includes the following sections:

"Before You Begin"
"Configuration Procedures"

Note:

You can assign a destination name to a connection list and assign a destination number to each line in the list. When that destination name is called, the numbers in the list are tried one by one until a connection is made or the list is exhausted.

Before You Begin

The IBM 2210 operates in leased line mode or in switched mode. If you are using switched mode, make sure that you have asynchronous modems that support the Hayes AT command set. Also, you must know the maximum DTE speed of each modem.

Configuration Procedures

This section describes how to configure your router for V.34. The tasks you need to perform are:

Adding V.34 addresses
Configuring V.34 parameters
Adding dial circuits
Configuring dial circuits

Note:

You must restart the router for changes to the V.34 configuration to take effect.

Adding V.34 Addresses

A default V.34 address is created when V.34 interfaces are initially configured (called "default_address"). Dial circuits configured on the V.34 interface default to the same address allowing some dial-in applications to work without modification of the V.34 address.

You need to add a V.34 address (or modify the default_address) if you plan to use dial-out applications. The V.34 address includes:

Address Name. The address name is a description of the address. You can use any string of up to 23 printable ASCII characters.

Network Dial Address. Telephone number of the local or destination port. You can enter up to 31 characters that are in the valid dial characters for the connected modem.

Note:

The valid character set for telephone numbers as defined by the CCITT and supported by the IBM 2210 includes:

The decimal digits 0 through 9
Colon (:) - "Wait Tone"
Left-angled bracket (<) - "Pause", used for inserting a fixed delay (dependent on modem) between digit sequences. For example, when going through a PBX or PTN.
Equal (=) - "Separator 3", which is "for national use." (Consult your modem manual.)
The letter P - "Dialing to be continued in Pulse mode." (Not supported by some modems.)
The letter T - "Dialing to be continued in DTMF mode." (Not supported by some modems.)

V.34 addresses are not interface specific so they are added from the main Config> prompt. For example:

     Config>add v34-address
     Assign address name [1-23] chars []? remote-site-baltimore
     Assign network dial address [1-20 digits][]? 1-909-555-1234

Configuring the V.34 Interface

This section explains how to configure the V.34 interface. To configure, do the following:

To set up a serial line interface for V.34, set the datalink protocol for the serial line interface. From the Config> prompt, use the set data-link v34 command. For example:
```
Config> set data-link v34
Interface Number [0]? 2
 
```
Note: The datalink is automatically set for integrated modem and cannot be changed.
Display the V.34 Config> prompt by entering the network command followed by the number of the interface. For example:
```
     Config>network 2
     V.34 Data Link Configuration
     V34 System Net Config    2>
```
You can use the list devices command at the Config> prompt to display a list of interface numbers configured on the router.
Use the set local-address command to specify the network address name of the local port. You must enter one of the address names you defined using the add v34-address command. For example:
```
     V34 System Net Config   2>set local-address
     Local network address name  []? remote-site-baltimore
```

Note:

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

Optional V.34 Parameters

The following are optional V.34 parameters you can set. For a complete description of these commands, see "V.34 Configuration Commands".

The V.34 interface allows routers to establish serial connections over leased lines or over switched telephone lines. Leased line mode uses a communications line dedicated to one destination. Switched mode gives you the potential to call other devices and not be dedicated to one destination.
You can limit the number of successive calls to an address that is inaccessible or that refuses those calls. To do so, use the set retries-no-answer and the set timeout-no-answer commands.
The set disconnect-timeout command controls the amount of time the router waits to initiate a call after dropping a signal from the previous call.
The set command-delay-timeout command specifies the amount of time the router waits to initiate or answer a call after it turns on DTR.
The set connect-timeout command specifies the number of seconds allowed for a call to be established.
The speed command sets the maximum DTE speed for the modem.
The modem-init-string command allows flexibility in modem configuration to accommodate user or external equipment requirements.
When you have finished configuring the interface, you can use the list command to display your configuration.

Adding Dial Circuits

Dial circuits are mapped to V.34 serial line interfaces. You can map multiple dial circuits to one serial line interface.

The V.34 interface supports multiple types of dial circuits. To add a dial circuit use one of the following commands from the Config> prompt.

add device dial-circuit
add device dial-in
add device dial-out

The software assigns an interface number to each circuit. You will use this number to configure the dial circuit.

Example:

Config> add device dial-circuit
Adding device as interface 6

Note:

Dial circuits default to the Point-to-Point protocol (PPP). Although the set data-link command can be used to set the datalink of a dial circuit to Frame Relay, only PPP dial circuits are supported over V.34.

Configuring Dial Circuits

This section describes how to configure a dial circuit. For a complete description of the dial circuit commands, see "Configuring and Monitoring Dial Circuits". To configure the dial circuit, do the following:

Display the Circuit Config> prompt by entering the network command followed by the interface number of the dial circuit. You can use the list devices command at the Config> prompt to display a list of the dial circuits that you added. For example:
```
     Config>network 6
     Circuit configuration
     Circuit Config>
```
Map the dial circuit to a V.34 interface. The Base net is the V.34 interface number. For example:
```
     Circuit Config>set net
     Base net for this circuit [0]?  0
```
Specify the address name of the remote router to which the dial circuit will connect. You must use one of the names you defined using the add v34-address command. For example:
```
    Circuit Config>set destination
    Assign destination address name []? newyork
```
Configure the dial circuit to initiate outbound calls only, accept inbound calls only, or both initiate and accept calls.
Use the set calls command. To avoid a conflict if both ends of the link attempt to establish a call at the same time, configure the dial circuit at one end of the link to accept inbound calls only, and configure the dial circuit at the other end of the link to initiate outbound calls only. For example:
```
    Circuit Config>set calls outbound
    Circuit Config>set calls inbound
```
Note: For WAN Restoral operations or another dial-on-demand application, you should set up the circuit for either inbound or outbound calls.
Specify the timeout period for the circuit.
Use the set idle command. If there is no traffic over the circuit for this specified time period, the dial circuit hangs up. To configure the circuit as a dedicated circuit, set the idle timer to zero. To configure the circuit to dial on demand, set the idle timer to a value other than zero. The range is 0 to 65535 and the default is 60 seconds. For example:
```
    Circuit Config>set idle
    Idle timer (seconds, 0 means always active) [60]? 0
```
Note: For WAN Restoral operations you must set the idle time to 0.
Optionally, you can delay the time between when a call is established and the initial packet is sent.
Use the set selftest-delay command. Setting a self-test delay can prevent initial packets from being dropped. If your modems take extra time to synchronize, adjust this delay. For example:
```
    Circuit Config>set selftest-delay
    Selftest delay(milli-seconds,0 means no delay)[150]?200
```
Set the inbound address name.
Use the set inbound command. You need to use this command only if you set up the circuit for both inbound and outbound calls and if the router's destination address is different from the destination address that the remote router dials. For example, the numbers would be different if one of the routers must go through a PBX, international, or inter-LATA exchange. For example:
```
    Circuit Config>set inbound
    Assign destination inbound address name []? newyork
```
The inbound address name must match one of the names that you defined using the add v34-address command.
Optionally, you can enter the configuration process for the datalink layer protocol that is running on the dial circuit (PPP or Frame Relay). Use the encapsulator command. For example:
```
Circuit Config>encapsulator
```

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