Cisco Cisco ONS 15454 SONET Multiservice Provisioning Platform (MSPP) Guía De Diseño

OL-4556-01

 

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As with SONET TDM and data services, Synchronous Digital Hierarchy (SDH) traffic can also be 
aggregated and transported across an ONS 15454 network.  STM-1 to STM-64 payloads can be 
transported over SONET from any port on a Cisco ONS 15454 OC-N card provisioned to support 
SDH signals.  This chapter explains how the ONS 15454 transports SDH traffic over SONET. 

 
This following topics are found in this chapter: 
 

Provisioning OC-N Ports for SDH, page 98 

    SDH to SONET Mapping, page 99 

   Synchronization, 

 

   Protection, 

 

   Alarm 

Reporting, 

 

SDH Over SONET Applications, page 102 

   STM-n 

Handoffs, 

 

   SDH 

Aggregation, 

 

   SDH 

Hairpinning, 

 

Managing Third-Party Network Equipment, page 104 

 

 

 
All port on Cisco ONS 15454 OC-N cards support both SONET and SDH signals.  Once an OC-N 
port is provisioned as an SDH signal, through the port-provisioning screen in CTC, the optical 
card processes the received signal as follows: 
 

    Termination of the incoming SDH signal [RSOH, MSOH and AU pointer(s)] 

 

The SS byte value is not checked. 

 

    Pointer(s) processing to locate the J1 byte, the 1st byte of the VC-3 or VC-4 POH (Au3 or 

Au4) 

 

    VC-4-Nc mapping into a STS-Mc where M=3xN or VC-3 mapping into a STS-1 for Au3 

SDH 

 

The POH and payload are not touched since that path is not terminated. 

 

    STS-Mc insertion into an OC-M facility where the SPE pointer is created and the S1S0 

bits of the H1 byte are set to 00 (received as 10 from the SDH line)