The central exchange/system shall be Alpha Communications® / Ring CB901 series or approved equivalent. System shall have a maximum capacity of 7200 total master and/or remote stations, in multiples of 8 stations. System shall have a minimum of (15) conversation paths (links), permitting up to (15) simultaneous conversations. The CB901 central exchange can be field upgraded with the addition of subscriber card(s) and required extension rack(s). Additional talk paths (links) are also available as an optional upgrade.
The CB901 system shall require simple 2 twisted pair home-run wiring from the central exchange to each master and/or remote station, and shall feature all-call, group call, hunt, priority, privacy, direct dialing, conference, camp-on busy, hurry-up, call-back, call-forwarding, secretary transfer, battery back-up and manual simplex override at the master station(s).
Optional features include radio paging, public address tie-in, 2 channels of program distribution, and emergency elevator annunciation.
Contractor shall observe all local and national electrical and building codes.
A variety of master and remote stations is available to meet virtually any system need.
||+/- 12V, +/1 5V, 0V Power
||Approx. 1 Amp plus 100mA per 8 station subscriber card. Maximum approx. 100 Watts Data unit approx. 1 Amp Cable
||1 Pair for system information/audio 1 Pair for DC power supply
||MC68000 (16 bits)
||EPROM 512 kbyte RAM 384 kbyte
||+10 to +35 degrees C. (+77 to +95 degrees F.)
Frequency Range: 300-5000 Hz
Galvanic Line: 0 dBm (1mW/600 ohm)
Speech level, idle: -12 dBm
Speech level, max: +4 dBm
Signaling level: -10 dBm
Signaling frequencies CCITT specifications