3Com 10014299 manual Set the line code format on the CE1/PRI interface

134CHAPTER 10: CONFIGURING WAN INTERFACE

Table 132 Set the line code format on the CE1/PRI interface

Operation	Command
Set the line code format on the CE1/PRI interface	code	{ ami hdb3 }
Restore the line code format on the CE1/PRI	undo	code
interface

By default, the line code format on the CE1/PRI interface is hdb3.

6Set line clock

When the CE1/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 CE1/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 CE1/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 CE1/PRI interface view.

Table 133 Set the line clock of the CE1/PRI interface

Operation	Command
Set the line clock of the CE1/PRI interface	clock { master slave }
Restore the line clock of the CE1/PRI interface	undo clock
to the default vale

By default, the line clock of CE1/PRI interface is slave clock.

7Set the frame format of interface

When the CE1/PRI interface operates in CE1/PRI mode, it supports two types of frame formats: crc and no-crc4. The frame format crc4 supports the 4-bit Cyclic Redundancy Check (CRC) on physical frames, whereas the frame format no-crc4does not.

Perform the following configurations in CE1/PRI interface view.

Table 134 Set the frame format of CE1/PRI interface

Operation	Command
Set the frame format of CE1/PRI interface	frame-format { crc4 no-crc4 }
Restore the frame format of CE1/PRI interface	undo frame-format

By default, the frame format of CE1/PRI interface is no-crc4.

8Enable/disable internal loopback/external loopback

The interface needs to be set to internal loopback or external loopback when during the test on some special functions.

Perform the following configurations in CE1/PRI interface view.

Table 135 Enable/disable the internal loopback/external loopback

Operation	Command
Enable the internal loopback/external loopback of	loopback
the CE1/PRI
Disable the internal loopback/external loopback of	undo loopback
the CE1/PRI