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Configuring SONET/SDH Framing

The 4-port OC48 PIC with SFP installed, the next-generation SONET/SDH PICs with SFP, and the 4-port OC192 PIC on M-series and T-series routing platforms, support SONET or SDH framing on a per-port basis. This functionality allows you to mix SONET and SDH modes on interfaces on a single PIC. You can use the framing statement to configure incoming SDH links from Europe and outgoing SONET links to the US on the same PIC. Traffic flowing through other ports of the same PIC will not be affected.

When you change SONET/SDH mode on a port, only the port's framing type is changed. The PIC does not go offline.

To configure framing on a per-port basis, include the framing (sdh | sonet) statement at the [edit interfaces so-fpc/pic/port] hierarchy level:



[edit interfaces]
so-fpc/pic/port {

framing (sdh | sonet);
}

Note: Per-port framing configuration is applicable for SONET interfaces in concatenated mode (default mode) only. When you configure a PIC to operate in nonconcatenated mode, the individual channels inherit framing configuration from the [edit chassis fpc number pic number framing (sonet | sdh)] hierarchy level.

Note: Automatic Protection Switching (APS) is used by SONET add/drop multiplexers (ADMs) to protect against circuit failures. If APS is configured, and you do not change the SONET/SDH mode on both the working and protection port, APS support will not function properly. Both the working and protection ports must have the same mode configuration.

To view interface information, use the operational mode command show interfaces so-fpc/pic/port.

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