Ring Communications CB901EX - Manual (Page 20)

CB901EX Operations Manual March 2011
PLUGGING IN PRINTED CIRCUITS CARDS
Plug the cards into the cardracks according to the actual central size. See Fig. 1.10 for correct card
positioning. Make sure that all cards are properly pressed into the plugs on the motherboard when using
two cardracks for a complete stage. Note that card positions 12/13 and 21/22 have the same station
equipment number (50-57 and 58-5F). You must therefore only plug subscriber cards into one of the
positions 12/13 or 21/22.
We advise positions 21/22 to be used, this leaves room in the basic cardrack for the future
connection of interlink cards.
INSTALLATION OF PROGRAM DISTRIBUTION CARD
The Program Distribution Control Card DP977 is installed in the Basic Cardrack DP 979. This
card distributes the Alarm/program audio signal to all the subscribers from the selected program
sources,- 2 alarm channel and 8 program channels.
INTERCONNECTION CABLE, INTERNAL ON MOTHERBOARD PCB979.
The Program Distribution Card NFE 1626 is normally installed in card position 10 (plug.pos
XA11) in the Basic Cardrack DP 979. If the central is fully equipped with subscriber cards (30 cards),
this feature card is to be installed in pos. 12 or 13.
In CB901EX systems the card positions 12 and 13 are used for Interlink B Card NFE1545. If not
used then the Subscriber Card NFE1625 can be installed in these positions, giving a total of 88
subscribers in the Basic Cardrack. If subscribers in these positions want to make use of the
Alarm/program Distribution Feature, a special flat cable, 20 pair with 4 connectors, must be installed
between card position 10, 11, 12 and 13 - plug P1, pins 1A/B to 20 A/B at the back of the Motherboard
NFE1523A. This cable NMF6012 is included in DP977 together with the Program Distribution Card
NFE1626. When this cable is installed, to utilize plug positions for subscriber connection, the Program
Distribution Card NFE1626 can be installed in any position from 10 to 13 incl. If no cable is installed
this card must be placed in card position 10. This cable must not be used when the NFE1545 is
installed. See Figure for cable location.
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