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Cisco IOSSoftware Configurationforthe Cisco12000Series One-PortChannelized OC-12/STM-4(DS1/E1)ISE Line

How to Configure Layer 1 Features

Cisco IOS Release 12.0(27)S1

Detailed Steps

After a T1 channel group is configured, it appears to the Cisco IOS software as a serial interface;

therefore, all the configuration commands for a serial interface are available, but not all commands are

applicable to the T1 channel group.

All the encapsulation formats, such as PPP, HDLC, and Frame Relay are applicable to the configured T1

channel group. Be sure that you are in serial interface configuration mode when you set the encapsulation

format.

All the switching types that are applicable to a serial interface are also applicable to the configured T1

channel group.

Note When a timeslot on a tributary is disabled, an idle pattern is transmitted on that slot. The idle pattern

number STS-1 configuration command changes the idle pattern globally for all the serial interfaces on

all 12 STS-1 paths. Under most operating circumstances there is no need to change the default values of

the idle pattern STS-1 configuration command.

Command Purpose

Step 1

t1-line-number

channel-group

channel-group-number

timeslots

list-of-timeslots

[speed {56 | 64}]

Example:

Router(config-ctrlr-sts1)# t1 1 channel-group 15

timeslots 1-5, 20-23

Configured in STS-1 configuration mode, creates

a logical channel group on a T1 line. Default speed

is 64 kbps.

• The example shows the configuring a logical

channel group in ct3 mode. The first T1 line is

assigned to logical channel group 15 with

channelized timeslots 1 to 5, and 20 to 23.

Step 2

t1-line-number

framing {esf | sf [hdlc-idle {0x7E |

0xFF}]}

Example:

Router(config-crtlr-sts1)# t1 1 framing sf

Specifies the T1 framing format.

Default is Extended Super Frame (ESF). Super

Frame (SF) format offers the hdlc-idle option,

which can be set to use either 0x7E or 0xFF as the

HDLC idle pattern.

Note When you select SF framing, consider

using the no t1-line-number yellow

detection command to turn off yellow

alarm detection, because the yellow alarm

can be incorrectly detected with SF

framing.

Step 3

t1-line-number

clock source {internal | line}

Example:

Router(config-crtlr-sts1)# t1 1 clock source line

Sets the internal or line (network) clock source.

Default is internal.

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 57 58

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