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The Packet-Over-SONET (POS) port adapter transports packet data over SONET links using the Point-to-Point Protocol (PPP) mapped into the STS-3c/STM-1 frame. Using POS, bandwidth on SONET links is used more efficiently than other transport methods - POS overhead is approximately half that of transport overhead as that involved with ATM using ATM adaptation Layer 5 (AAL5) and line card control (LCC) Subnetwork Access Protocol (SNAP).
Key Features:
Standards-compliant SONET/SDH interface
SONET automatic protection switching
Full-duplex operation at 155 Mbps
SEE ALSO:
Packet over SONET Interface Processor (POSIP) for POS applications on Cisco 7500/VIP2 systems
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Description |
Cisco 7100 |
Cisco 7200 |
Cisco 7200VXR |
Cisco 7500/VIP2 |
Part Number |
|---|---|---|---|---|---|
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1-port Packet/SONET OC3c/STM1 Multi-mode Port Adapter |
Yes |
Yes |
Yes |
Yes |
PA-POS-OC3MM |
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1-port Packet/SONET OC3c/STM1 Single-mode (IR) Port Adapter |
Yes |
Yes |
Yes |
Yes |
PA-POS-OC3SMI |
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1-port Packet/SONET OC3c/STM1 Single-mode (LR) Port Adapter |
Yes |
Yes |
Yes |
Yes |
PA-POS-OC3-SML |