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138 CHAPTER 10: CONFIGURING WAN INTERFACE
By default, the attenuation of transmission cable that the CT1/PRI interface
matches is long 0db.
5 Set the line code format
A CT1/PRI interface supports two types of line code formats: ami format and b8zs
format.
Perform the following configurations in CT1/PRI interface view.
Table 143 Set the line code format on the CT1/PRI interface
By default, the line code format on the CT1/PRI interface is b8zs.
6 Set line clock
When the CT1/PRI interface operates as DCE, you should choose the internal
clock, that is, master clock mode. When it operates as DTE, you should choose
the line clock, that is, slave clock mode.
When the CT1/PRI interfaces on two routers are directly connected, the two ends
will respectively operate in line clock mode (slave) and internal clock mode
(master). When the CT1/PRI interfaces on routers are connected to a switch, the
switch will operate as DCE which provides clock signal, the interfaces on the
routers will operate in line clock mode (slave).
Perform the following configurations in CT1/PRI interface view.
Table 144 Set the line clock of the CT1/PRI interface
By default, the line clock of CT1/PRI interface is slave clock.
7 Set the frame format of interface
A CT1/PRI interface supports two frame formats: Super Frame (SF) and Extended
Super Frame (ESF). In SF format, multiple frames can share the same
frame-synchronization information and signaling information, so that more
significant bits can be used to transmit user data. In practice, a system should be
tested often. The application of ESF satisfies the requirement that the services are
still in normal operation even at the time of testing.
Perform the following configurations in CT1/PRI interface view.
Table 145 Set the frame format of CT1/PRI interface
Set the CT1/PRI interface to use long-distance
transmission cable
cable long { 0db | -7.5db |
-15db | -22.5db }
Set the CT1/PRI interface to use short-distance
transmission cable
cable short { 133ft | 266ft |
399ft | 533ft | 655ft }
Restore the default value of the transmission
cable used by the CT1/PRI interface
undo cable
Operation Command
Set the line code format on the CT1/PRI
interface
code { ami | b8zs }
Restore the line code format on the CT1/PRI
interface
undo code
Operation Command
Set the line clock of the CT1/PRI interface clock { master | slave }
Restore the line clock of the CT1/PRI interface
to the default vale
undo clock
Operation Command