E1SS-4020 creates four  identical pairs of  outputs from a single pair of  E1 bitstreams.

The source stream connection is made through four BNC connectors.  Streams to be monitored are  buffered split and re-formatted to form copies of the originals on four identical pairs of BNC connectors.

The unit is AC powered and supplied in a 1U rackmount case.

E1SS-4020 is part of the E1SS product range, which also includes a programmable Router for E1/PRI distribution, monitoring and recording applications.