Configuring an E1-F interface
E1-F interfaces, which are fractional E1 interfaces, are simplified CE1 interfaces. They are a cost-effective alternative to CE1 interfaces for E1 access services that do not require multiple channel sets.
An E1-F interface has the following features:
In framed mode, an E1-F interface can bind timeslots into only one channel set. In contrast, a CE1 interface can group and bundle timeslots randomly into multiple channel sets.
An E1-F interface can operate in either framed (the default) or unframed mode.
In unframed mode, an E1-F interface provides 2048 kbps of data bandwidth. For the interface, a synchronous serial interface is created automatically.
In framed mode, an E1-F interface is physically divided into 32 timeslots numbered 0 through 31. Timeslot 0 is used for transmitting synchronization information. All other timeslots can randomly form one channel set. For the channel set, a synchronous serial interface is created automatically. The interface rate is n × 64 kbps, where n is the number of bundled timeslots.
The synchronous serial interface created in either mode has the same logical features as a standard synchronous serial interface and supports the following protocols:
Data link layer protocols, such as PPP, HDLC, and Frame Relay.
Network layer protocols, such as IP.
You can configure this interface in the same way you configure a standard synchronous serial interface.