E1/T1 Channels Channelized by a CPOS Interface
A CPOS interface can be channelized to multiple E1/T1 channels to converge E1/T1 lines of different enterprise branches. Each E1/T1 line contains one channel or several channels.
The E1 channel of a CPOS interface can work in unchannelized or channelized mode.
In unchannelized mode, an E1 channel works at a rate of 2 Mbit/s without timeslot division. The logical features of an E1 channel are the same as those of a synchronous serial interface.
The name and number of the interface formed by the E1 channel are serial interface-number/e1-number:0. interface-number specifies the number of the CPOS interface, and e1-number specifies the E1 channel number.
When an E1 channel works in channelized mode, the 2 Mbit/s transmission line is divided into 32 timeslots at a rate of 64 kbit/s. The 32 timeslots are numbered 0 to 31, and timeslot 0 transmits synchronization signals. Timeslots except timeslot 0 can be randomly bundled into a channel set that functions as an interface. The rate of the interface is N x 64 kbit/s, in which N is the number of timeslots bundled into a channel set. The interface has the same logical features as a synchronous serial interface.
The name and number of the interface formed by the E1 channel are serial interface-number/e1-number:set-number. interface-number specifies the number of the CPOS interface, e1-number specifies the E1 channel number, and set-number specifies the number of the channel set.
The T1 channel of a CPOS interface can work in unchannelized or channelized mode.
In unchannelized mode, a T1 interface works at a rate of 1.544 Mbit/s without timeslot division. The logical features of a T1 channel are the same as those of a synchronous serial interface.
The name and number of the interface formed by the T1 channel are serial interface-number/t1-number:0. interface-number specifies the number of the CPOS interface, and t1-number specifies the T1 channel number.
When a T1 channel works in channelized mode, timeslots numbered 1 to 24 can be randomly bundled into a channel set that functions as an interface. The rate of the interface is N x 56 kbit/s or N x 64 kbit/s, in which N is the number of timeslots bundled into a channel set. The interface has the same logical features as a synchronous serial interface.
The name and number of the interface formed by the T1 channel are serial interface-number/t1-number:set-number. interface-number specifies the number of the CPOS interface, t1-number specifies the T1 channel number, and set-number specifies the number of the channel set.