T carrier network test apparatus and method

Abstract

A customer service unit (CSU) with adjunct equipment is connected to the end of a T Carrier link at the trunk side of a CPE switch such as a PBX and includes one or more connections around the CPE switch to the line or station side. The adjunct includes a facility for dropping and inserting a selected T Carrier link connected to the CPE switch and to route the insert via one of the connections around the CPE switch to the line side thereof. The adjunct is controlled by a remote terminal which may be disposed at a primary switch to which the CPE switch is connected by a T Carrier trunk which includes the T Carrier links. The combination is arranged to permit the establishment of a loop circuit from one port of a MAP position at the primary switch through a preselected T Carrier link into the trunk side of the CPE switch and thence through the circuit around the switch to the adjunct and insert back to the primary switch and the second MAP port thereof. The arrangement permits testing both from the MAP position and from the insert position.

Dependencies are inferred from the claim text.