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    EOPM84
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    VLM155S
    VLM155
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    CDR155G(LQFP-32)
    CDR155G-H (LQFP-32)
    CDR155G-H (SOP-28)
    DOHP155T-676
    DOHP155T-320
    DOHP155T-ADM
    MTUP(PQFP-160)
    MTUP (LQFP-128)
    MUX155 (Green Package)

SFP Module
    SFP-101
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    SFP-113


Overview
STM-1/STS-3 Dual Bus Ethernet Mapper of 4-port with LCAS
VLM155S (GC68561B-LG)
    The VLM155S is designed for SONET/SDH add/drop multiplexer, multi-service access platform for unidirectional single/dual ring applications.
   Ethernet payload can be mapped/demapped into/from SONET/SDH. Virtual Concatenation Group via the RMII port. SONET/SDH Low Order or High Order VC Virtual Concatenation SPE are supported, Virtual Concatenation SPE formats support up to VC3-3v/ VC12-63v/ VC11-64v.External RAM interface is also provided to compensate transmission delays for different VCG members.
    VLM155S can compensate the maximum transmission delay up to ±250ms by 128Mb ofexternal SDRAM.

Key Features
 
1.
Support single RMII Port, the RMII port can be configure to support 10/100M operation.
2.
Support Ethernet Frame (RMII) Encapsulation/De-capsulation Protocol of
-
ITU-T G.7401, Generic Framing Procedure (GFP)
-
ITU-T X.86 Link Access Procedure SDH (LAPS)
3.
Virtual Concatenation Group can support up to VC3-3v or VC12-63v or VC11-64v
4.
External RAM Interface is provided to compensate Transmission Delay of different Virtual Concatenation Group Members. Up to ±250ms Differential Transmission Delay can be compensated using 128 Mb SDRAM.
5.
Low latency (e.g. less than 150us for the Ethernet frame of 64 bytes) supports excellent performance for Ethernet switching applications.
6.
Support ITU-T G.7042 LCAS to provide hitless operation of dynamic bandwidth management.

Product Applications
 
1.
Multi-Service Ethernet Switch
2.
Multi-Service Access Platform
3.
SONET/SDH Add-Drop Multiplexer
4.
IP DSLAM

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