3Com 3031 Command Reference Manual page 194

194 C 3: I M C
HAPTER NTERFACE ANAGEMENT OMMANDS
Description
Using the e1 unframed command, you can set an E1 line on a CE3 interface to
work in unframed mode (E1 mode). Using the undo e1 unframed command, you
can set the E1 line on the CE3 interface to work in framed mode (CE1 mode).
By default, E1 lines are working in framed mode.
An E1 line in unframed mode does not contain the frame control information and
cannot be divided into timeslots. Naturally, no timeslot bundling can be performed
on it. In this case, the system automatically creates a serial interface numbered
serial number / line-number:0 for it. This interface operates at 2048 Kbps and has
the same logic features of a synchronous serial interface on which you can make
other configurations.
For related command, see e1 channel-set.
Example
Set the first E1 line on the E3 interface to work in unframed mode.
[3com-E3 1/0/0]e1 1 unframed
loopback
Syntax
loopback { local | payload | remote }
undo loopback
View
CE3 interface view
Parameter
local: Enables the CE3 interface to perform local loopback.
payload: Places the CE3 interface in an remote payload loopback. Data passes the
framer in this case and will be looped back after payload is generated.
remote: Enables the CE3 interface to perform remote loopback. Data does not go
through the framer in this case and will be looped back before the payload has
been generated.
Description
Using the loopback command, you can configure the loopback mode of a CE3
interface. Using the undo loopback command, you can disable the CE3 interface
to perform loopback.
By default, loopback is disabled on the CE3 interface.
It is necessary for you to enable the CE3 interface to perform loopback only for the
purpose of testing some special functions.