3Com 3031 Command Reference Manual page 192

192 C 3: I M C
HAPTER NTERFACE ANAGEMENT OMMANDS
View
CE3 interface view
Parameter
line-number: E1 line number in the range of 1 to 16.
crc4: The frame format adopted by an E1 line is crc4.
no-crc4: The frame format adopted by an E1 line is no-crc4.
Description
Using the e1 set frame-format command, you can configure the frame format for
an E1 line. Using the undo e1 set frame-format command, you can restore the
default setting.
By default, the frame format no-crc4 is used for E1 line.
Only if an E1 line is working in framed format (which can be set by using the undo
e1 unframed command) can this command be configured.
For related command, see e1 unframed.
Example
Configure the first E1 line on the E3 interface to adopt the frame format crc4.
[3com-E3 1/0/0]e1 1 set frame-format crc4
e1 set loopback
Syntax
e1 line-number set loopback { local | remote }
undo e1 line-number set loopback
View
CE3 interface view
Parameter
line-number: E1 line number in the range of 1 to 16.
local: Enables E1 line to perform local loopback.
remote: Enables E1 line to perform remote loopback.
Description
Using the e1 set loopback command, you can set the loopback mode of an E1 line
on an E3 interface. Using the undo e1 set loopback command, you can disable the
E1 line to loop back.
By default, E1 lines are disabled to loop back.