Ring Communications DXC901 - Manual (Page 6)

SEPTEMBER 2003 DIGITAL EXCHANGE CONTROLLER DXC901
B6 RING COMMUNICATIONS INC.
NOTE
Install and test the CB901 central exchange before starting the
DXC901 installation. See CB901-1 installation manual for
additional information.
A F AUL T can be caused by a short or open on the substation audio pair or a loss of power. A F AULT will not
cause Program Channel activation.
Privacy on a Master station with annunciator display (Subscriber type 2) is used for controlling the Night
Transfer feature. Privacy = Transfer mode. The transfer status is sent to all nodes in the system . The
Annunciator in Transfer mode will still get calls but the time delay for the call to the next Annunciator is now
set to 0 (the next Annunciator will therefore get calls immediately). Multiple levels of transfer is possible.
All answered calls can be placed in P ARK : a state in which any other node can retrieve the call
(similar to hold).
The DXC901 also monitors the system battery charge voltage. The threshold is factory preset to
25VDC. Loss of charge voltage will turn off the charge indicator.
A PWRFAIL may be sent to the DAD104 for acknowledge and to the event log printer. This feature
is handled by subscriber address FF in the DXC901 and may be programmed from the DNA100 in
the same manner as substation:
Set Subscriber type to 0
Set Subscriber dial number to match the stage number (Stage 1 = 0001, stage = 0002 etc.)
Set Location to “ Stage 1 DXC901"
Set Call Priority
Set Annunciator address
Set Printer address
INSTALLATION
Card Position :
In a CB901-1 configuration the DXC901 is installed in card position 13 in the DP979, and the
NFE1626 (program distribution card DP977) will be installed in slot 12. The NMF6012 cable supplied
with the DP977 must be modified by removing one connector position and installing the NMF6012
cable between positions 10-12 only.
For CB901-2 and CB901-M with single master Digital Network Controller (DNC) the DXC901 is
installed in slot 12 and the NFE1626 in slot 11. Two connectors are cut from the NMF6012 so that
when installed it only covers positions 10 and 11. (See Chapter E - DXB901)