Cisco WS-C3550-12G, Руководство пользователя

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Cisco Catalyst Switch Manager User Guide
OL-4930-01
Chapter 8 Interface and Subinterface Management
Serial Subinterface Management—Configuration Window
DS-3 Tab
The following areas are available on the DS-3 tab of the Serial Subinterface Management - Configuration
window:
•
DS-3 Serial Interface
• SONET Path Header (C2)
•
SONET Path Header (J1)
DS-3 Serial Interface
The DS-3 Serial Interface area contains the following information:
• Framing—Framing for optical digital transmission. SONET is the North American standard; SDH
is the European standard.
• 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.
• 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.
• Encapsulation—Indicates whether HDLC or PPP encapsulation is used on the interface.
• 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.
•
DSU Bandwidth—DSU subrate bandwidth in kilobits per second. This attribute reduces the DS3
bandwidth by padding the T3 frame.
•
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.