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Ordering Information
The Cisco ASR 900 series 1-Port OC-12/STM-4 module delivers four active ports of OC-3 or Synchronous Transport Module level 1 (STM-1) connectivity or one active port of OC-12 or STM-4 connectivity on the Cisco ASR 900 series routers.

The module is supported in all interface module slots on the Cisco ASR 900 series routers and can be clocked from a line or from an internal clock source.

By using per-port software licenses, this module delivers a true multiservice and multirate capability in a small form factor in combination with a pay-as-you-grow pricing model. The interface module can be software configured as either Synchronous Optical Networking (SONET) mode or Synchronous Digital Hierarchy (SDH) mode per module in the ASR 900 series configuration.

The interface module hardware has been designed for high availability; this includes Access Circuit Redundancy (ACR), 1+1 Automatic Protection Switching (APS) across two modules, and SDH Linear Multiplexer Section Protection (MSP) protocols.
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