Aastra OpenCom 510 User Guide - Page 52
Technical Information, to 3000 m if a 0.4 mm twisted-pair cable is used.
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Interfaces and Connectible Terminals a/b Ports The intercom system should be installed by qualified personnel only as sensor/ actor contacts will need to be connected to the "DoorLine" module. 5.4.2 Technical Information The a/b ports have been implemented as RJ45 sockets. Each of the devices listed above can be connected to the a/b interface by means of a two-wire 1:1 cable. A two-wire cable connected to an a/b port can be up to 6500 m long, provided it is a 0.6 mm twisted-pair cable, or up to 3000 m if a 0.4 mm twisted-pair cable is used. The 50 Hz/40 V AC ringing voltage of the eight interfaces is supplied by the interface card. Pin Assignment 12345678 a/b interface pin assignment The following Table explains the a/b interface pin assignment. Pin Number 1 2 3 4 5 6 7 8 Assignment Not used Not used Not used Channel a Channel b Not used Not used Not used 50