Configuring a CT1/PRI Interface (CT1 Mode)

Procedure

1. Run system-view

   The system view is displayed.

2. Configure the 1E1T1-M/2E1T1-M interface card to work in CT1/PRI mode.
   1. Run display device

      Information about the 1E1T1-M/2E1T1-M interface card is displayed. You can check the slot ID of the interface card, whether the interface card is installed in the slot, and whether it is working properly.

   2. Run display workmode { slot slot-id | all }

      The working mode of the 1E1T1-M/2E1T1-M interface card is displayed.

   3. Run set workmode slot slot-id e1t1 t1-data

      The 1E1T1-M/2E1T1-M interface card is configured to work in CT1/PRI mode.

      By default, a 1E1T1-M/2E1T1-M interface card works in CE1/PRI mode (e1-data).

      After completing this step, reset the 1E1T1-M/2E1T1-M interface card and wait for a while for the configuration to take effect.

      The 4E1T1-M/8E1T1-M interface card only works in CE1/PRI mode (e1-data) and does not support working mode switching.

3. Run controller t1 interface-number

   The specified CT1/PRI interface view is displayed.

4. (Optional) Cancel the PRI set bundling.

   Perform this step if the CT1/PRI interface needs to switch from the PRI mode to the CT1 mode.

   1. Enter the view of the serial interface generated by the PRI interface from the system view, and then run the shutdown command to shut down the serial interface.
   2. Enter the CT1/PRI interface view, and then run the undo pri-set command to cancel the PRI set bundling.

5. Run channel-set set-number timeslot-list list [ speed { 56k | 64k } ]

   The specified timeslots are bundled into a channel set.

   After you perform this step, the system automatically creates a serial interface. The number format of a serial interface is "serial interface-number:set-number". interface-number specifies the number of a CT1/PRI interface, and set-number specifies the number of a channel set. This interface has the same logical features as a synchronous serial interface, and you can configure other parameters on the interface, including the IP address, link layer protocol (such as PPP and FR), and NAT.

6. Configure other parameters on the CT1/PRI interface.

   • Run description text

     The interface description is configured.

   • Run cable { long { -7.5db | -15db | -22.5db } | short { 133ft | 266ft | 399ft | 533ft | 655ft } }

     The attenuation or length of the transmission line matching the CT1/PRI interface is configured.

     The default attenuation of the transmission line on a CT1/PRI interface is -7.5 dB.

     When signals that the router receives are of a good quality, use the default configuration.

   • Run clock { master | slave }

     The clock mode is set.

     By default, a CT1/PRI interface works in slave clock mode and uses line clock signals.

     When a CT1/PRI interface functions as a Data Circuit-terminating Equipment (DCE) interface, it must work in master clock mode and provide clock signals for a Data Terminal Equipment (DTE) interface. When a CT1/PRI interface functions as a DTE interface, it must work in slave clock mode and obtain clock signals from a DCE interface.

   • Run alarm-threshold { ais { level-1 | level-2 } | lfa { level-1 | level-2 | level-3 | level-4 } | los { pulse-detection value | pulse-recovery value } }

     Alarm thresholds are configured for the CT1/PRI interface.

     The default alarm thresholds are as follows:

     • AIS alarm: level-1.
     • Loss of frame alignment (LFA) alarm: level-1.
     • Loss of Signal (LOS) alarm: The value of pulse-detection is 176 and the value of pulse-recovery is 22, indicating that a LOS alarm is generated if less than 22 pulses are detected within 176 pulse intervals.

   • Run frame-format { esf | sf }

     The frame format is set.

     By default, a CT1/PRI interface uses ESF as the frame format.

   • Run idlecode { 7e | ff }

     The line idle code is set.

     By default, a CT1/PRI interface uses the line idle code 0x7e.

   • Run itf { number number | type { 7e | ff } }

     The interframe filling tag and the number of interframe filling tags are set.

     By default, a CT1/PRI interface uses the interframe filling tag 0x7e and four interframe filling tags.

   • Run data-coding { inverted | normal }

     Data inversion is configured.

     By default, a CT1/PRI interface does not invert data.

   • Run detect-rai

     RAI detection is configured.

     By default, RAI detection is enabled on a CT1/PRI interface.