Testing of functional blocks of digital communication system - having test signals processed during normal on line operation

摘要

The on line testing facility has two interfaces (LIFA, LIFB) coupled onto parallel buses (A,B) which alternate in transmit and receive modes, and coupled to the buses are function blocks (MFC, CAS, ACS) that connect with a CPU. The interfaces connect with the PLM multilines of different exchanges. Typically each interface may provide 32 channels. The function P blocks provide a test facility and respond to test unit (TEA, TEB) generated bytes. The tests are carried out during normal system operations. ADVANTAGE - On line testing of telephone communication system.