Configuring a T1 Interface with Quick Configuration

Add logical interfaces

Defines one or more logical units that you connect to this physical T1 interface. You must define at least one logical unit for a T1 interface. You can define multiple units if the encapsulation type is Frame Relay.

Click Add.

Logical Interface Description

(Optional) Describes the logical interface.

Type a text description of the logical interface to more clearly identify it in monitoring displays.

IPv4 Addresses and Prefixes

Specifies one or more IPv4 addresses for the interface.

1. Type one or more IPv4 addresses and prefixes in dotted decimal notation. For example:

   10.10.10.10/24

2. Click Add.
3. Click OK.

Physical Interface Description

(Optional) Adds supplementary information about the physical T1 interface.

Type a text description of the T1 interface to more clearly identify it in monitoring displays.

MTU (bytes)

Specifies the maximum transmission unit size for the T1 interface.

Type a value between 256 and 9192 bytes. The default MTU for T1 interfaces is 1504.

Clocking

Specifies the transmit clock source for the T1 line.

From the list, select one of the following:

• internal—Services Router's own system clock (the default)
• external—Clock received from the T1 interface

Encapsulation

Specifies the encapsulation type for traffic on the interface.

From the list, select the encapsulation for this T1 interface:

• PPP
• Frame Relay
• Cisco HDLC

Enable CHAP

Enables or disables CHAP authentication on a T1 interface with PPP encapsulation only.

• To enable CHAP, select the check box.
• To disable CHAP, clear the check box.

Use System Host Name

Specifies that the T1 interface uses the Services Router's system hostname in CHAP challenge and response packets.

• To enable, select the check box (the default).
• To disable, clear the check box.

Local Name

If Use System Host Name is disabled, specifies the local name for CHAP to use.

Type a local name for this T1 interface.

CHAP Peer Identity

Identifies the client or peer with which the Services Router communicates on this T1 interface.

Type the CHAP client name.

CHAP Secret

Specifies the secret password for CHAP authentication, known to both sides of the connection.

Type a password that is known to the other side of the connection. Use a combination of letters and numbers that is difficult for others to guess.

Framing Mode

Specifies the framing mode for the T1 line.

From the list, select one of the following:

• esf—Extended superframe (the default)
• sf—Superframe

Line Encoding

Specifies the line encoding method.

From the list, select one of the following:

• ami—Alternate mark inversion
• b8zs—Binary 8 zero substitution (the default)

Byte Encoding

Specifies the byte encoding method.

From the list, select one of the following:

• nx56—7 bits per byte
• nx64—8 bits per byte (the default)

Invert Data

Enables or disables data inversion. Data inversion is normally used only in alternate mark inversion (AMI) mode.

• To enable, select the check box.
• To disable, clear the check box.

Timeslots

Specifies the number of time slots allocated to a fractional T1 interface. By default, a T1 interface uses all the time slots.

Type numeric values from 1 through 24. You can use any combination of time slots. To configure ranges, use hyphens. To configure discontinuous slots, use commas. For example:

1–5,10,24

Frame Checksum

Specifies the number of bits in the frame checksum. A 32–bit checksum provides more reliable packet verification, but is not supported by some older equipment.

Select 16 or 32. The default value is 16.

Line Buildout

Specifies the T1 line buildout in feet for cables 655 feet (200 m) or shorter, or in decibels for longer cables.

Line buildout compensates for the loss in decibels based on the distance from the device to the first repeater in the circuit.

From the list, select one of the following line buildouts:

• 0–132 (0 m–40 m) (the default)
• 133–265 (40 m–81 m)
• 266–398 (81 m–121 m)
• 399–531 (121 m–162 m)
• 532–655 (162 m–200 m)
• long-0db
• long-7.5db
• long-15db
• long-22.5db