SONET/MSPP 301
SONET (and SDH) technology features several key improvements over the proprietary
technology it replaced:
?– It is standard. This enabled systems from multiple vendors to interoperate. It also
allowed the RBOCs to develop uniform operating procedures for their new fiber
deployments, which lowered operating costs dramatically.
?– It provides a synchronous multiplexing hierarchy. This radically simplified the
functions of optical transport equipment, because it no longer needed to recover the
original plesiochronous DS1 or DS3 signal to switch it; transport equipment could
now synchronously switch DS1s and DS3s (or aggregates of them) carried within
VTs or STSs. SONET??™s multiplexing hierarchy also enabled service providers to
deploy a single fundamental technology that could scale from 155Mbps (OC-3) to
10Gbps (OC-192) and beyond.
SONET Signal Bit Rate (Mbps) SDH Signal SONET Capacity SDH Capacity
STS??“1, OC??“1* 51.840 STM??“0 28 DS??“1s or 1 DS??“3 21 E1s
STS??“3, OC??“3 155.520 STM??“1 84 DS??“1s or 3 DS??“3s 63 E1s or 1 E4
STS??“12, OC??“12 622.080 STM??“4 336 DS??“1s or 12 DS??“3s 252 E1s or 4 E4s
STS??“48, OC??“48 2,488.
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