1.Provide standard telephone and relay channels.

2.Value can be set to meet the needs of most users.

3.It can be easily modified in working condition.

4.It can be programmed to T1 / E1.

5.Built-in full time slot TSI (time slot interchange), non-blocking connect 4 external ports plus local channel.

6.Having two or four self-healing ring network with fiber optic configuration.