| 摘要 |
FIELD: telephony, can find application in cross-bar automatic telephone systems and in outgoing and/or incoming message cross-bar units at their expansion or replacement of equipment whose service life has expired, as well as in automatic telephone exchanges, type ATC-AMЭ. SUBSTANCE: the unit uses a monitoring selector, test engagement system and simulator of received direction number. The selection stage unit outputs engagement system has a specific design. EFFECT: expanded functional abilities of the selection stage unit-monitoring of serviceability of talk wires and determination of condition of units of the next selection stage. |
