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20-8
ATM Switch Router Software Configuration Guide
OL-7396-01
Chapter20 Configuring Frame Relay to ATM Interworking Port Adapter Interfaces
Configuring the Channelized E1 Frame Relay Port Adapter
Configuring the CE1 Frame Relay Port Adapter Interface
If your CE1 Frame Relay port adapter needs to be configured, you must have the following information:
• Digital transmission link information, for example, E1 clock source and framing type
• Channel information and time slot mapping
• Protocols and encapsulations you plan to use on the new interfaces
To manually change any of your default configuration values, perform the following steps, beginning in
global configuration mode:
Example
The following example shows how to change the clock source to free-running using the clock source
command.
Switch(config)# controller e1 1/0/0
Switch(config-controller)# clock source free-running
Configuring the Channel Group on the CE1 Frame Relay Port Adapter
A channel group, also referred to as a serial interface, is configured on an E1 line by associating time
slots to it. The channel group can have from 1 to 31 time slots (DS0s). The transmission rate or
bandwidth of the channel group is calculated by multiplying the number of time slots times 64 kbps.
To configure the channel group, perform the following steps, beginning in global configuration mode:
Example
The following example shows how to configure time slots 1 through 5 and 20 through 23 on E1 channel
group 5 using the channel-group command.
Switch(config)# controller e1 0/1/0
Switch(config-controller)# channel-group 5 timeslots 1-5, 20-23
Command Purpose
Step 1
Switch(config)# controller e1 card/subcard/port
Switch(config-controller)#
Specifies the controller interface port and enters
controller configuration mode.
Step 2
Switch(config-controller)# clock source
{free-running | loop-timed | reference |
network-derived}
Configures the type of clocking.
Step 3
Switch(config-controller)# framing {crc4 |
no-crc4}
Configures the E1 framing type.
Command Purpose
Step 1
Switch(config)# controller e1 card/subcard/port
Switch(config-controller)#
Specifies the controller interface port and enters
controller configuration mode.
Step 2
Switch(config-controller)# channel-group
number {timeslots range | unframed}
Configures the identifier and range of E1 time
slot number(s) that comprise the channel group.
The keyword unframed configures a CE1Frame
Relay interface as clear channel (unframed).