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
Channelized SONET Interface Management Window
–
Primary—Indicates that the SONET controller provides the first priority clock for internal
circuitry. Secondary indicates that the SONET controller provides the clock if the primary clock
source fails.
– localTiming—Indicates that the transmit clock source is generated internally.
–
localTimingPrimary—Indicates that local timing is used and the SONET controller provides the
first priority clock for internal circuitry.
– localTimingSecondary—Indicates that local timing is used and the SONET controller provides
the clock if the primary clock source fails.
•
Loopback Mode—Indicates whether or not SONET loopback mode is enabled. The possible values
are:
– None—Indicates that the loopback is disabled.
–
Internal—Indicates data is looped from the transmit path to the receive path allowing
diagnostics to send data to itself without relying on any external connections. To enable internal
loopback, you must first set the clock source to internal.
– Line—(external) Indicates data is looped from the external port to the transmit port and back
out the external port.
•
Framing—Framing for optical digital transmission.
Note
SDH framing is currently unsupported on the channelized SONET modules even though IOS
CLI allows the interface to be configured for SDH framing.
SONET Medium
The SONET Medium area contains the following information. All attributes in this area are read-only.
•
Type—Indicates whether a SONET or SDH signal is used on the interface.
• Line Type—Line type of the interface. The following values are possible:
–
sonetShortSingleMode
– sonetLongSingleMode
– sonetMultiMode
• Line Coding—Line coding for the interface.
–
sonetMediumB3ZS—For electrical SONET/SDH signals (STS-1 and STS-3).
– sonetMediumCMI—For electrical SONET/SDH signals (STS-1 and STS-3).
–
sonetMediumNRZ—Non-return to zero, which is used for optical SONET/SDH signals.
–
sonetMediumRZ—Return to zero, which is used for optical SONET/SDH signals.
– sonetMediumOther—Other.