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140 CHAPTER 10: CONFIGURING WAN INTERFACE
supporting the data link layer protocols PPP, HDLC, Frame Relay, LAPB and X.25, as
well as the network protocols IP and IPX.
When it works in framed mode, however, it is physically divided into 32 time slots
numbered in the range of 0 to 31. In these time slots, except for time slot 0 used
for synchronization information transmission, all the other time slots can be
randomly bound into one channel set. E1-F interface has the rate of nx64kbps,
owns logical features of synchronous serial interface, and supports the data link
layer protocols PPP, Frame Relay, LAPB and X.25 as well as the network protocols IP
and IPX.
Configure E1-F Interface E1-F interface configuration includes:
■ Enter the view of a specified interface
■ Set interface operating mode
■ Set interface rate after binding operation
■ Set line code format
■ Set line clock
■ Set interface frame format
■ Enable or disable local/remote loopback
1 Enter the view of a Specified Interface
Unlike CE1/PRI interface, E1-F interface has no Controller view. The system identify
an E1-F interface as a synchronous serial interface, so entering the view of E1-F
interface is equivalent to entering the view of the corresponding serial interface.
Perform the following configuration in all views.
Table 148 Enter the view of an E1-F interface
E1-F interface is sequenced based on the same numbering and are numbered
together with the synchronous serial interfaces. For example, insert one 1E1-F
module in slot 0 on a 3Com Router, and one 4SA module in slot 1. Hence, the
E1-F interface will be numbered Serial 0, and the 4SA interfaces will be numbered
Serial 1 through Serial 4.
2 Set Interface Operating Mode
E1-F interface can work in both unframed and framed modes.
Perform the following configuration in E1-F interface view.
Table 149 Set Operating mode for an E1-F interface
By default, E1-F interfaces work in framed mode.
3 Set Interface Rate after Binding Operation
When E1-F interface works in framed mode, time slot binding on the interfaces
can be made according to user's demands.
Operation Command
Enter the view of an E1-F interface interface serial serial-number
Operation Command
Set an E1-F interface to work in unframed mode fe1 unframed
Set the E1-F interface to work in framed mode undo fe1 unframed