Specifying Channel Groups - Cisco 10000 Series Configuration Manual

Chapter 5 24-Port Channelized E1/T1 Line Card Configuration
Table 5-6
Line Length (feet)
330 to 440
440 to 550
550 to 660

Specifying Channel Groups

A channel group is a serial interface. At a framed E1 port, you can assign bandwidth to as many as 31
channel groups numbered from 1 to 31 in 64-kbps increments called timeslots. When you specify an E1
port as unframed, you only assign a single channel group whose bandwidth is 2048 kbps. At a T1 port,
you can assign bandwidth to as many as 24 channel groups in 56- or 64-kbps timeslot increments. T1
ports can not operate in unframed mode.
Specifying E1 Channel Groups
An E1 port has 32 fixed timeslots available. In framed mode, timeslot 0 is used for framing and can not
be used. Each E1 timeslot is a 64-kbps DS0 band. To create E1 interfaces that supports subscriber traffic
rates from 64 kbps to 2048 kbps on any of the 24 line card ports, you combine timeslots into channel
groups. You use the channel-group command to create one or more interfaces at any port operating in
E1 mode.
The E1 channel groups have these characteristics:
•
•
•
•
After you configure a line card as an E1 controller, you can create one or more logical E1 channel groups
from the timeslots available at each port using the following controller command syntax:
[no] channel-group channel-group-number {timeslots list-of-timeslots [speed 64]
Where:
•
•
•
OL-8834-04
T1 Short-Haul Line Buildout
Cable Length Value
440
550
660
A channel group is an interface.
You partition each line card port into channel groups. A framed port can have as many as 31 E1
channel groups consisting of from 0 to 31 timeslots. At any port:
A channel group that includes all 32 timeslots (0 to 31) is a single unframed (unchannelized)
–
E1 interface whose bandwidth is 2048 kbps.
A channel group that includes 31 timeslots (1 to 31) is a single framed (channelized) E1
–
interface whose bandwidth is 2048 kbps.
A channel group that consists of fewer than 31 timeslots is a single framed fractional E1
–
interface whose bandwidth you assign from the port timeslot pool (see the
Controller" section on page
Each group of 31 framed timeslots can be grouped into multiple fractional E1 interfaces.
A timeslot cannot be part of more than one E1 channel group.
channel-group channel-group-number is a number from 0 to 30 that you assign to identify each
channel group you create.
timeslots list-of-timeslots can be a value from 1 to 31, or a combination of timeslots from 1 to 31.
You indicate a timeslot range using a hyphen, commas, or a combination of both. One timeslot
defines a single E1 channel as shown by the following examples.
speed 64 specifies the digital data rate of a single timeslot as 64 kbps (default).
5-6).
Cisco 10000 Series Router Line Card Configuaration Guide
Controller Configuration Commands
"Configuring an E1
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unframed
5-21
}