Specifications

Specify Timeslots
Configuring Serial Interfaces IC-107
The no form of this command disables loopback requests. For example, the no service-module t1
remote-loopback full command ignores all full-bandwidth loopback transmissions and requests.
Configuring the no form of the command may not prevent telco line providers from looping your
router in esf mode, because fractional T1/T1 telcos use facilities data-link messages to initiate
loopbacks.
If you enable the service-module t1 remote-loopback command, the loopback remote commands
on the FT1/T1 CSU/DSU module will not be successful.
Specify Timeslots
To define timeslots for FT1/T1 module, use the following command in interface configuration mode:
This command specifies which timeslots are used in fractional T1 operation and determines the
amount of bandwidth available to the router in each timeslot. The range specifies the DS0 timeslots
that constitute the FT1/T1 channel. The range is from 1 to 24, where the first timeslot is numbered
1, and the last timeslot is numbered 24. Specify this field by using a series of subranges separated by
commas. The timeslot range must match the timeslots assigned to the channel group. In most cases,
the service provider defines the timeslots that comprise a channel group. Use the no form of this
command to select all FT1/T1 timeslots transmitting at 64 kbps, which is the default.
To use the entire T1 line, enable the service-module T1 timeslots all command.
Enable T1 CSU WIC
The following are prerequisites to enable the T1 CSU WIC:
• Leased line from your telephone company
• Configuration parameters depending on your specific telephone company. For most connections,
the default settings should suffice:
— service-module t1 clock source line
— service-module t1 data-coding normal
— service-module t1 timeslots all speed 64
— service-module t1 framing esf
— service-module t1 lbo none
— service-module t1 linecode b8zs
— no service-module t1 remote-alarm-enable
— no service-module t1 fdl
Note To view the current configuration, use the show service-module serial slot/port command.
For further information about these commands and how to change them, refer to the Cisco IOS
configuration guides and command references that shipped with your router.
Command Purpose
service-module t1 timeslots {range | all
} [speed
{56
| 64}]
Specify timeslots.