Ring Communications CB901EX - Manual (Page 17)

April 2012 Operations Manual CB901EX
CABLE TERMINATION IN STATION SOCKET
Station type: Master Stations AA916, AA917 w/display - modular 8 pin RJ45 socket.
Leads No. 1 and No. 2 - Audio Signaling Leads
Lead No. 1 to be connected to pin No. 5 in the RJ45 station socket.
Lead No. 2 to be connected to pin No. 4 in the RJ45 station socket.
Leads No. 3 and No. 4 - Station Operation Voltage.
Lead No. 3 is positive and must be connected to pin No 3 in the RJ45 socket.
Lead No. 4 is negative and must be connected to pin No. 6 in the RJ45 socket.
Station type: All station types (Sub- and Master) using Hirschmann 6 pin socket
Leads No. 1 and No. 2 - Audio Signalling Leads
Lead No. 1 to be connected to pin No. 1 in the Hirschmann socket.
Lead No. 2 to be connected to pin No. 2 in the Hirschmann socket.
Leads No. 3 and No. 4 - Station Operation Voltage.
Lead No. 3 is positive and must be connected to pin No 3 in the socket.
Lead No. 4 is negative and must be connected to pin No. 4 in the socket.
NOTE: Always use a separate power pair for each station to the DC power source, to avoid
crosstalk.
If an extra loudspeaker is required in parallel to the station’s speaker, connect to pins 1 and 2 on
the RJ45 wall socket or to pin 5 and 6 on the Hirschmann wall socket. Note,min. Combined I
mpedance 16 ohm.
NOTE: It is stressed that the station’s built-in output amplifier shall not be overloaded. Therefore,
when an extra speaker is used, the station’s volume control shall not be set higher than half-way. If
extra power is needed, an extra booster amplifier (e.g. FC 420/10W with independant power supply)
must be inserted between pins 1 and 2 on RJ45 (or pin 5 and 6 on the Hirschmann plug) and the one or
more parallel speakers.
CABLE TERMINATION IN CENTRAL CARDRACK
Connection of stations wires.
Each subscriber card (DP978) can connect 8 intercom stations. A flat cable connects each
subscriber card to the BF901(PCB933) on the back plate (MA901) of the DP979/DP980. The BF901
can connect 3 subscriber cards (24 intercom stations). Two 25 pair cables (CBL25P/20) connect each
BF901 to the Main Distribution Frame (MDF). 12 intercoms stations (audio+power) on each cable.
The CBL25P/20 cable is 20 feet long with connectors at both ends. The cable can be cut in half to
provide two 10 foot cables for the BF901. The connectors plug in to the BF901 and the other end of the
cable (24AWG solid) punch down to the MDF . The MDF may be Krone, S110, 66 blocs or similar.
The intercom position in the central have hexadecimal numbering.
See Fig. 1.9. for terminal layout.
See Fig. 1.10. for conversion from hexadecimal position number to decimal call number.
This basic cardrack can be reduced providing only 88 or 80 subscribers, but positions 12 and 13
have parallel card positions 21-22 in subscriber cardrack. Subscribers must either be connected in
position 12/13 or 21/22. The subscriber cardrack will then consist of 160 subscribers (20 subscriber
Page 17 of 77
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