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Configuring Channelized OC12 Interfaces

 

On Channelized OC12 PICs, you can configure 12 T3 channels per port. To configure channelized OC12 interface properties, you can include the sonet-options and t3-options statements at the [edit interfaces interface-name] hierarchy level. Some SONET/SDH options are ignored, and some can only be configured for channel 0, though they apply equally to all channels. The long-buildout statement under t3-options is also ignored.

For T3 channels on a channelized OC12 interface, the clocking statement is supported only for channel 0; it is ignored if included in the configuration of channels 1 through 11. The clock source configured for channel 0 applies to all channels on the channelized OC12 interface. The individual T3 channels use a gapped 45-MHz clock as the transmit clock. When you configure the clock source for a channelized interface—ds-fpc/pic/port :0, for example—you must also include the channel-group statement at the [edit chassis] hierarchy level and specify channel group 0. For more information, see Clock Sources on Channelized Interfaces.

For more information, see SONET/SDH Interfaces Overview and T3 Interfaces Overview. For a configuration example, see Configuring Aggregated SONET/SDH Interfaces.

Table 1 summarizes the OC12-to-DS3 numbering scheme.

Table 1: OC12-to-DS3 Numbering Scheme

Two-Level STS-1 Number (STS-3,STS-1)

One-Level STS Number

OC12-to-DS3 PIC DS3 Number

1,1

1

0

1,2

2

1

1,3

3

2

2,1

4

3

2,2

5

4

2,3

6

5

3,1

7

6

3,2

8

7

3,3

9

8

4,1

10

9

4,2

11

10

4,3

12

11

Example: Configuring Channelized OC12 Interfaces

The following configuration is sufficient to get the channelized OC12 interface up and running. The OC12 interface can be divided into 12 channels. DS3 channels can use the following encapsulation types:

  • PPP, PPP CCC, and PPP TCC

  • Frame Relay, Frame Relay CCC, and Frame Relay TCC

  • Cisco HDLC, Cisco HDLC CCC, and Cisco HDLC TCC

The channels can also have logical interfaces.