Pos Tab; Pos Interface; Path Message (C2); Path Message (J1) - Cisco WS-C3550-12G User Manual

Chapter 8 Interface and Subinterface Management

POS Tab

The following areas are available on the POS tab of the POS Sub-interface Management - Configuration
window:
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POS Interface

The POS Interface area contains the following information:
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Path Message (C2)

The Path Message (C2) area contains the following information:
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Path Message (J1)

The Path Message (J1) area contains the following information:
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OL-4930-01
POS Interface
Path Message (C2)
Path Message (J1)
CRC—Cyclical redundancy check (CRC) word size. The CRC is an error-checking technique that
uses a calculated numeric value to detect errors in transmitted data.
Payload Scrambling—Indicates whether or not SONET payload scrambling is enabled on the
interface. Payload scrambling ensures that there is sufficient bit-transition density to maintain the
transmit clock for synchronous signalling. Both ends of the connection must use the same
scrambling algorithm.
Encapsulation—Indicates whether HDLC or PPP encapsulation is used on the interface.
SONET Overhead C2 Byte—Value of the SONET overhead Path Signal Label (C2), which indicates
the contents of the SONET STS-SPE Higher Order VC. This attribute is read-only. These are
possible values:
207 (0xCF) = PPP or HDLC with no payload scrambling
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– 22 (0x16) = PPP or HDLC with payload scrambling
Expected Size—Maximum length of the expected receive SONET Path overhead message in bytes.
Expected Label—The expected receive SONET Path overhead message. If the expected label is
longer than the expected size, it will be truncated.
Transmit Size—Maximum length of the transmitting SONET Path overhead message in bytes.
Transmit Label—Transmitting SONET Path overhead message. If the transmitting label is longer
than the transmitting size, it will be truncated.
Modify Path Message (J1) button—Launches the POS Sub-interface Management - Modify POS J1
window to modify the expected receive and transmit SONET Path overhead message.
POS Subinterface Management—Configuration Window
Cisco Catalyst Switch Manager User Guide
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