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Framing Mode Overview


You can use the framing statement to configure incoming SDH links from Europe and outgoing SONET links to the US on the same PIC or MIC. Traffic flowing through other ports of the same PIC or MIC will not be affected.

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


Per-port framing configuration is applicable for SONET interfaces in concatenated mode (default mode) only. When you configure a PIC or MIC to operate in nonconcatenated mode, the individual channels inherit framing configuration from the [edit chassis fpc number pic number framing (sonet | sdh)] hierarchy level. For per-port framing on SONET/SDH OC3/STM1 (Multi-Rate) MICs with SFP (MIC-3D-4OC3OC12-1OC48,MIC-3D-8OC3OC12-4OC48) in MX series routers, set the framing at the [edit chassis fpc slot-number pic pic-number port port-number] hierarchy level.


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.

The following MICs and PICs support SONET or SDH framing mode on a per-port basis:

  • 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, MX Series, and T Series routers.

  • The SONET/SDH OC3/STM1 (Multi-Rate) MICs with SFP, the Channelized SONET/SDH OC3/STM1 (Multi-Rate) MICs with SFP, and the OC192/STM64 MICs with XFP on MX Series routers.

The 1-port OC192/STM64 MICs with XFP on MX Series routers support SONET or SDH framing on the single port. This functionality allows you to mix SONET and SDH modes on interfaces on a single PIC or MIC.

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