GB1480595A - Anomaly detector for automatic telephone switching networks - Google Patents

Abstract

1480595 Automatic exchange systems S SARRIC J HUGON and J BROSSERON 28 June 1974 [28 June 1973] 28750/74 Heading H4K Anomalies recurring in a marker controlled cross-bar switching network are recorded in binary coded former in a register. The anomalies described include: use of overflow links, and internal or external blocking. Anomalous behaviour usually occurs in conjunction with a marking of the line or trunk frames in which case the identity of the switch outlet is also recorded in binary format. If the register is unavailable, e.g. due to slow print-out, a lost messages counter is incremented. Fig. 5 depicts a pair of system markers 11, 21 each of which controls a line or trunk frame over the marking multiples SLA-SLD. Each marker is coupled via an independent monitoring circuit 12-15 and 22-25 to a common print-out unit 32. The markers supply 3-digit line and 2-digit trunk frame data in 2 out of 5 code to a transcoder 14 which converts the data into binary. Whenever the transcoder is enabled, even if the data supplied thereto is invalid, e.g. more or less than 2 of the 5 wire multiples marked, it causes an anomalies coder 13 to start a programmer 17. Anomalies coder 13 is also operable to convert anomaly signals in 2/5 code from a marker into binary code for submission to the register 15. This is a set of bi-stables controlled by a 4 phase clock which is effective to gate the data in the transcoder 14 and the coder 13 into a binary register 15 prior to its entry into a print out. If for any reason an anomaly cannot be recorded as register 15 full up, a lost message counter 19 is incremented. A maximum of three anomalies per call may be recorded.