Configuring a CE1 interface
The following TDM systems are available in the data communications system:
E1 system—Recommended by ITU-T and widely used in Europe and China.
T1 system—Recommended by ANSI and widely used in North America and Japan. (Japan uses the J1 system. This system is considered to be a T1 system because of their similarity.)
A CE1 interface can operate in channelized or unchannelized mode. Support for the channelized and unchannelized modes depends on the card type.
Channelized mode is also called CE1 mode. In CE1 mode, a CE1 interface is physically divided into 32 timeslots numbered 0 to 31. Timeslot 0 is used to transmit synchronizing information.
In CE1 mode, you can bundle all timeslots except timeslot 0 into a maximum of 31 channel sets.
For each channel set, the system automatically creates a serial interface named serial interface-number:set-number. This interface has the same logical features as a standard synchronous serial interface. The interface supports settings including:
Data link protocols, such as PPP, HDLC, or FR.
IP addressing.
Interface backup settings if the interface is used as a primary or backup interface.
NAT and packet filtering.
Unchannelized mode is also called E1 mode.
For a CE1 interface in E1 mode, the system automatically creates a 2.048 Mbps serial interface named serial interface-number:0. This interface has the same logical features as a standard synchronous serial interface. The interface supports settings including:
Data link protocols, such as PPP, HDLC, or FR.
IP addressing.
Interface backup settings if the interface is used as a primary or backup interface.
NAT and packet filtering.