Technical Documentation

Configuring SAToP on 4-port Channelized OC3/STM1 Circuit Emulation PICs

This configuration example applies to the mobile backhaul application shown in Mobile Backhaul Application.

Configuring SONET/SDH Framing Mode at the PIC Level

To set the framing mode at the PIC level, for all four ports on the PIC, include the framing statement at the [edit chassis fpc fpc-slot pic pic-slot] hierarchy level:

[edit chassis fpc fpc-slot pic pic-slot]framing (sonet | sdh); # SONET for COC3 or SDH for CSTM1

After a PIC is brought online, interfaces are created for the PIC’s available ports according to the PIC type and the framing option used:

If you include the framing sonet statement (for a COC3 Circuit Emulation PIC), four COC3 interfaces are created.
If you include the framing sdh statement (for a CSTM1 Circuit Emulation PIC), four CSTM1 interfaces are created.
If you do not specify framing at the PIC level, then the default framing is SONET for all four ports.

Note: If you set the framing option incorrectly for the PIC type, the commit operation fails.

Bit error rate test (BERT) patterns with all ones received by T1/E1 interfaces on Circuit Emulation PICs configured for SAToP do not result in alarm indication signal (AIS) defect. As a result, the T1/E1 interfaces remain up.

Configuring SONET/SDH Framing Mode at the Port Level

Each port’s framing mode can be configured individually, as either COC3 (SONET) or STM1 (SDH). Ports not configured for framing retain the PIC framing configuration, which is SONET by default; if you have not specified framing at the PIC level. To set the framing mode for individual ports, include the framing statement at the [edit chassis fpc fpc-slot pic pic-slot port port-number] hierarchy level:

[edit chassis fpc fpc-slot pic pic-slot port port-number]framing (sonet | sdh); # SONET for COC3 or SDH for CSTM1

Configuring the framing mode at the port level overwrites the previous PIC level framing mode configuration for the specified port. Subsequently configuring the PIC level framing mode overwrites the port level framing configuration. For example, if you would like three STM1s and one COC3; then it would be practical to first configure the PIC for SDH framing and then configure one port for SONET framing.

Configuring COC3 Ports Down to T1 Channels

On any port configured for SONET framing (numbered 0 through 3), you can configure three COC1 channels (numbered 1 through 3). On each COC1 channel, you can configure 28 T1 channels (numbered 1 through 28). To configure COC3 channelization down to COC1 and then down to T1 channels, include the partition statement at the [edit interfaces (coc1 | coc3)-fpc/pic/port] hierarchy level as in the following example:

[edit interfaces]coc3-1/0/0 {partition 1 oc-slice 1 interface-type coc1;}coc1-1/0/0:1 {partition 1 interface-type t1;}

After you partition the T1 channels, configure the SAToP options on them in the same way as for T1 interfaces. See Setting the SAToP Options.

Configuring CSTM1 Ports Down to E1 Channels

On any port configured for SDH framing (numbered 0 through 3), you can configure one CAU4 channel. On each CAU4 channel, you can configure 63 T1 channels (numbered 1 through 63). To configure CSTM1 channelization down to CAU4 and then down to E1 channels, include statements for the various interface types at the [edit interfaces] hierarchy level as in the following example:

[edit interfaces]cstm1-1/0/1 {no-partition interface-type cau4;}cau4-1/0/1 {partition 1 interface-type e1;}e1-1/0/1:1 {encapsulation satop;unit 0;}

After you configure the E1 channels, configure SAToP options on them in the same way as for E1 interfaces. See Setting the SAToP Options.