Cisco 1-Port OC3C/S Spare PA-POS-OC3MM= Hoja De Datos

SONET Automatic Protection Switching (APS), also known

as SDH Multiplex Section Protection (MSP), is a mechanism

designed to provide fault-tolerance through fiber cable

redundancy in SONET/SDH networks. Defined in the

specification developed by Bellcore, APS allows rapid

switchover from the working fiber to the protection fibers

in case of a fiber cut or module failure, signal failure, or

signal degradation, thereby increasing the network overall

survivability and robustness.

The POS PA supports APS (and MSP) for network

designs in which the Cisco 7200 or 7500 is connected directly

to SONET/SDH equipment that also support APS such

as Add/Drop Multiplexors (ADM).

In addition to supporting the payload scrambling defined

in RFC 1619, the POS PA also supports the more robust

ATM Forum scrambling technique defined in the RFC 1619

addendum. This is an optional scrambling feature for the

POS PA that allows synchronization to be maintained

and SONET errors to be avoided. This hardware-based

capability is transparent to the user and adds to overall

network stability.

The POS PA also supports both CRC-16 and CRC-32

for error detection in transmitted data. Either CRC-16

or CRC-32 can be optionally enabled, and can either operate

concurrently with the ATM Forum payload scrambling.

In general, CRC-16 provides backward compatibility with

existing equipment, while CRC-32 provides more robust

advanced error detection.

The following protocol and management information base

(MIB) are supported:

• SNMP agent v1 (RFC 1155-1157)

• MIB II (RFC 1213)

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9

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