Cisco 6504-E User Guide - Page 281

Chapter 5 Physical Object Dialog Boxes C6576M OSM POS Subinterface Dialog Box POS Tab Figure 5-88 shows the POS tab of the C6576M OSM POS Subinterface dialog box. Figure 5-88 POS Tab of the C6576M OSM POS Subinterface Dialog Box POS Interface Area The POS Serial Interface area contains the following information: • 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. Path Message (C2) Area The Path Message (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 5-167