Cisco 6504-E User Guide - Page 267
SONET Path Header C2 Area, SONET Overhead C2 Byte-Value of the SONET overhead Path Signal Label C2
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Chapter 5 Physical Object Dialog Boxes C6576M OSM Serial Subinterface Dialog Box • 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. • DSU Mode-Data Service Unit (DSU) mode. This enables interoperability with other DSUs. The local interface configuration must match the remote configuration. This attribute can have the following values: - adtran - cisco - digital-link - larscom - verilink - kentrox (6) Note The Kentrox DSU/CSU mode is configurable in the CLI but is currently not supported. The C6576M EMS will allow a user to configure this value, but it will log a warning message indicating that the value is unsupported by IOS. • Near End Loopback Mode-Near end channel loopback mode. This mode can have the following values: - disabled - local-Sets the loopback after going through the framer toward the terminal. - network-Puts the near end in network loopback. • Far End Loopback Mode-Far end channel loopback mode. If enabled, this mode puts the far end in loopback by sending far-end alarm control (FEAC). This mode has the following values: - disabled - remote • 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. • DSU Bandwidth-DSU subrate bandwidth in kilobits per second. This attribute reduces the DS3 bandwidth by padding the T3 frame. SONET Path Header (C2) Area The SONET Path Header (C2) area contains the following information: • 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 - 22 (0x16) = PPP or HDLC with payload scrambling Cisco 6500/7600 Series Manager User Guide 5-153