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CT3 Interface 151
Table 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.
Table 179 Set loopback mode of T1 channel
By default, loopback is disabled.
5 Set Frame Format
Two frame formats are used on CT3 interface: M23 and C-bit.
Perform the following configuration in CT3 interface view.
Table 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.
Table 181 Set the frame format of T1 channel
By default, the frame format of T1 channel is ESF.
6 Configure 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.
Table 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