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Overview

Dual SDH STM-1 Overhead Processor, DOHP155T-676
(GC98676A-BG)

   The DOHP155T-676 is a monolithic integrated circuit that processes the section overhead of STM-1 streams at up to 155.52 Mb/s and implements payload alignment and path termination for VC-4 payload.
   The DOHP155T-676 receives dual SDH STM-1 frames via a bit serial interface and it processes dual regeneratorsection overhead and APS bytes (K1, K2). It supports 1+1 MSP protection. Only the “multiplexer section” overhead on the selected STM-1 data stream is processed. On the outgoing STM-1 stream, the STM-1 data excluded REG Overhead, K1/K2 and B2 are duplicated. It performs framing (A1, A2), de-scrambling, detects alarm conditions, and monitors regenerator section and multiplex section bit interleaved parity (B1, B2), accumulating error counts at each level for performance monitoring purposes. Multiplex section far end block error (REI) indications (M1) are also monitored. A 1, 16 bytes section trace (J0) sequence may be processed.
   The DOHP155T-676 transmits SDH STM-1 frames, via a bit-serial interface, and formats regenerator section and multiplex section overhead appropriately. It performs framing pattern insertion (A1, A2), scrambling, alarm signal insertion, and creates regenerator section and multiplex section bit interleaved parity (B1, B2) as required to allow performance monitoring at the far end.Multiplex section far end block error (REI)

Key Features
 
1.
Support AU4 or AU3 mode
2.
SDH STM-1 TOH and POH processor.
3.
Support dual STM-1 framer and dual REG overhead processing for 1+1 MSP protection.
4.
Compensates for high and low order point of PDH.
5.
Support Cross-Connect Function.
6.
Operates at 155.52 MHz bit serial of 155.52 Mbits/s data stream.
7.
Supports dual Telecom bus to interface with GCI’s VLM155, P1M8 and P3M3 Mappers.

Product Applications
 
1.
SDH add/drop multiplexer
2.
SDH path terminal multiplexer
3.
SDH cross connect system
4.
SDH test equipment
5..
Broadband Access Node

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