Cisco Systems 78-13983-04 manual Configuring T1 and E1 Interfaces, Configuring T1 Interfaces

Chapter 4 Configuring with the Command-Line Interface

Configuring T1 and E1 Interfaces

Configuring T1 and E1 Interfaces

To configure a T1/E1 multiflex trunk interface, enter the following Cisco IOS commands at the router prompt.

Note Before you begin, disconnect all WAN cables from the router to keep it from trying to run the AutoInstall process. The router tries to run AutoInstall whenever you power it on if there is a WAN connection on both ends and the router does not have a valid configuration file stored in NVRAM (for instance, when you add a new interface). It can take several minutes for the router to determine that AutoInstall is not connected to a remote Transmission Control Protocol/Internet Protocol (TCP/IP) host.

Configuring T1 Interfaces

To configure the T1 interfaces, do the following while still in global configuration mode:

Step 1 Specify the controller that you want to configure. For information about interface numbering, see Understanding Interface Numbering, page 2-1.

Router(config)# controller t1 slot/port

Step 2 Specify the framing type.

Router(config-controller)# framing esf

Step 3 Specify the line code format.

Router(config-controller)# linecode b8zs

Step 4 Specify the channel group and time slots to be mapped. For the VWIC interfaces, you can configure two channel-groups (0 and 1) on the first T1 port or you can configure one channel-group ( 0 or 1) on each T1 port. Once you configure a channel group, the serial interface is automatically created.

Note The default speed of the channel group is 56. To get full DS0/DS1 bandwidth, you must configure a speed of 64.

Router(config-controller)#channel-group 0 timeslots 1-24 speed 64

Step 5 Configure the cable length.

Router(config-controller)# cablelength feet

Note Although you can specify a cable length from 0 to 450 feet, the hardware only recognizes two ranges: 0 to 49 and 50 to 450. For example, entering 35 feet uses the 0 to 49 range. If you later change the cable length to 40 feet, there is no change because 40 is within the 0 to 49 range. However, if you change the cable length to 50, the 50 to 450 range is used. The actual number you enter is stored in the configuration file.

Step 6 Exit controller configuration mode.

Router(config-controller)# exit

Cisco MWR 1900 Mobile Wireless Edge Router Software Configuration Guide

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