3Com 10014299 manual Set the line code format on the CT1/PRI interface

138 CHAPTER 10: CONFIGURING WAN INTERFACE
	Set the CT1/PRI interface to use long-distance	cable long { 0db -7.5db
	transmission cable	-15db -22.5db }
	Set the CT1/PRI interface to use short-distance	cable short { 133ft 266ft
	transmission cable	399ft 533ft 655ft }
	Restore the default value of the transmission	undo cable
	cable used by the CT1/PRI 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

Operation	Command
Set the line code format on the CT1/PRI	code	{ ami b8zs }
interface
Restore the line code format on the CT1/PRI	undo	code
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

Operation	Command
Set the line clock of the CT1/PRI interface	clock { master slave }
Restore the line clock of the CT1/PRI interface	undo clock
to the default vale

By default, the line clock of CT1/PRI interface is slave clock.

7Set 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

Operation

Command