Configuring an E1-F Interface (Framed Mode)
To use a low-rate (512 kbit/s for example) E1 channel to transmit services, configure an E1-F interface to work in framed mode.
Pre-configuration Tasks
Before configuring an E1-F interface, complete the following task:
Install a 1E1T1-F/2E1T1-F/4E1T1-F/8E1T1-F interface card on the router and ensure that it is registered successfully
Context
E1-F interfaces on both ends must be configured with the same parameters except for the clock mode. Otherwise, devices on both ends cannot communicate properly.
Procedure
- Run system-view
The system view is displayed.
- Configure the 1E1T1-F/2E1T1-F interface card to work in E1-F mode.
Run display device
Information about the 1E1T1-F/2E1T1-F 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.
Run display workmode { slot slot-id | all }
The working mode of the 1E1T1-F/2E1T1-F interface card is displayed.
Run set workmode slot slot-id e1t1-f e1-f
The 1E1T1-F/2E1T1-F interface card is configured to work in E1-F mode.
By default, a 1E1T1-F/2E1T1-F interface card works in E1-F mode.
After completing this step, reset the 1E1T1-F/2E1T1-F interface card and wait for a while for the configuration to take effect.
The 4E1T1-F/8E1T1-F interface card only works in E1-F mode and does not support working mode switching.
- Run interface serial interface-number
The E1-F interface view is displayed.
- Run undo fe1 unframed
The E1-F interface works in framed mode.
By default, an E1-F interface works in framed mode.
- (Optional) Run fe1 timeslot-list list
The specified timeslots are bundled into a channel.
By default, all timeslots on an E1-F except timeslot 0 are bundled into a channel, and the rate of the E1-F interface is 1984 kbit/s.
This step is required when the rate of an E1-F interface needs to be changed.
- Run fe1 line-termination { 75-ohm | 120-ohm }
The cable type applicable to the E1-F interface is specified.
By default, the cable type applicable to an E1-F interface is 120 ohm balanced cable (twisted pair).
This step is required when the type of the cable connected to an E1-F interface changes.
- Configure other parameters on the E1-F interface.
Run description text
The interface description is configured.
Run fe1 clock { master | slave | system }
The clock mode is set.
By default, an E1-F interface works in slave clock mode and uses line clock signals.
When an E1-F 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 an E1-F interface functions as a DTE interface, it must work in slave clock mode and obtain clock signals from a DCE interface.
Run crc { 16 | 32 | none }
The CRC mode is set.
By default, an E1-F interface uses 16-bit CRC.
Run fe1 idlecode { 7e | ff }
The line idle code is set.
By default, an E1-F interface uses the line idle code 0x7e.
Run fe1 frame-format { crc4 | no-crc4 }
The frame format is configured.
By default, an E1-F interface uses the basic frame format (no-crc4).
Run fe1 itf { number number | type { 7e | ff } }
The interframe filling tag and the number of interframe filling tags are set.
By default, an E1-F interface uses the interframe filling tag 0x7e and sends four filling tags between two frames.
Run fe1 data-coding { inverted | normal }
Data inversion is configured.
By default, an E1-F interface does not invert data.
Run fe1 detect-rai
RAI detection is enabled.
By default, RAI detection is enabled on an E1-F interface.
