CT3 Interface 151
Tabl e 178 Set loopback mode of the CT3 interface
Difference between two types of external loopback of the CT3 interface: Frame
header overhead should be processed for external payload loopback (payload)
while frame is not processed for external remote loopback (remote).
By default, loopback is disabled.
Single-channel loopback can be set on the T1 channels on a CT3 interface, and
the settings of individual channels are independent.
Tabl e 179 Set loopback mode of T1 channel
By default, loopback is disabled.
5Set Frame Format
Two frame formats are used on CT3 interface: M23 and C-bit.
Perform the following configuration in CT3 interface view.
Tabl e 180 Set frame format of the CT3 interface
By default, the CT3 interface uses the C-bit frame format.
When CT3 interface work in CT3 mode, single-channel frame format can be set
on the T1 channels, and the settings of individual channels are independent.
Perform the following configurations in CT3 interface view.
Tabl e 181 Set the frame format of T1 channel
By default, the frame format of T1 channel is ESF.
6Configure Operate Mode of CT3 Interface
When setting the operating mode of a CT3 interface, you should set the operating
modes of both the CT3 interface and the T1 channels on the interface.
Perform the following configuration in CT3 interface view.
Tabl e 182 Set the operating mode of CT3 interface
Operation Command
Set loopback mode of CT3 interface loopback { local | payload |
remote }
Disable loopback on the CT3 interface undo loopback
Operation Command
Set loopback mode of T1 channel t1 line-number set loopback { local
| remote }
Disable loopback on the T1 channel undo t1 line-number set loopback
Operation Command
Set CT3 frame format frame-format { c-bit | m23 }
Restore the default setting undo frame-format
Operation Command
Set the frame format of T1 channel frame-format { sf | esf }
Restore the frame format of T1 channel to the
default value undo frame-format
Operation Command
Configure Operate Mode of CT3 Interface using { t3 | ct3 }
Restore Operate Mode of CT3 Interface to default undo using