для Cisco Cisco ONS 15454 SONET Multiservice Provisioning Platform (MSPP)

The Cisco ONS 15454 SONET MSPP SDH tunneling provides a SDH traffic transport solution with 
scalable SONET, data or DWDM multiservice capabilities.

The Cisco ONS 15454 leadership in the optical transport market is partly due to its unprecedented 
aggregation capacity where any type of traffic can be efficiently multiplexed together and transported 
within the metro network or handed off to DWDM networks for inter-city transport.

Similar to SONET TDM and data services, SDH traffic too is aggregated and transported across an ONS 
15454 network. STM-1 to STM-64 payloads are transported over SONET from any port on a 
Cisco ONS 15454 OC-N card provisioned to support SDH signals.

This application note is applicable to software releases 6.x and later. 

All Cisco ONS 15454 optical modules support both SONET and SDH signals. Once a port is provisioned 
using Provisioning > Port in CTC to support an SDH signal, the

 

cards process the received signal as 

follows: 

Terminates the incoming SDH signal (RSOH, MSOH and AU pointer(s))

Pointer processes to locate the J1 byte of the HO-POH (1st byte of VC-4-Nc)

Maps VC-4-Nc into a STS-Mc where M = 3 x N 

Inserts STS-Mc 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) 

At the far end of an SDH tunnel, the reverse process takes place, transitioning the signal from SONET 
to SDH as follows:

Drops STS-Mc from OC-M facility (SPE pointer processed and J1 byte of the HO-POH located)

Maps STS-Mc into a VC-4-Nc where M = 3 x N

Creates an AU pointer with the value 10 for the SS bits as required for SDH