Based on self -copyright  IC.

The equipment for 4U 19 inch a total of optical port plate with 16 function board.

Maximum configured to call 256,if you want to configure SNMP Network management need to remove a 16 way call board configuring 1*N E1 board needing to remove a 16 way call board too.

90 Channel voice access, supports caller ID feature and reverse polarity billing functions.