Ring Communications DXC901 - Manual (Page 7)

SEPTEMBER 2003 DIGITAL EXCHANGE CONTROLLER DXC901
B7 RING COMMUNICATIONS INC.
NOTE
If any DIP switches are changed while the DXC901 is operating,
it must be RESET or powered off and back on, in order for the
changes to become valid.
Network Wiring Connections : Figure 21
A BF925 subscriber card strap is used for connections to the DXC901. The BF925 is installed in
back of the DXC901 in the same manner as subscriber connections on plug P2. When the BF925
is installed in the central, connect a twisted pair (24 AWG solid wire) for the network to pins
8A (DATA+) and 8B (DATA-). Then connect -12 VDC from the negative side of a spare fuse location
to pin 1A,B. Use a full pair for this connection. The +12 VDC side of this fuse should be used for the
network RJ45 test jack at the central. See Figure 21.
If using remote power supplies at the network nodes, the network will require reference to earth
ground. To provide this, connect the -12 VDC output of the power supply to the earth ground
terminal on the power supply, or make a grounding connection from the negative side of the battery
directly to building ground. (Follow all applicable local codes.)
For programming and/or testing and troubleshooting purposes, an 8-pin modular jack (Ring part
number - KB171, RJ45 type) must be installed at the CB901 central as a node tap. It is
recommended to connect the DATA pair from the central to a connection point that allows the
network pair to all other devices to be disconnected from the central for trouble shooting, leaving
only the central equipment and the test jack. Connect +12 VDC from the positive side of the spare
subscriber fuse where the DXC901 ground point is connected to pin 2 of the modular jack and -12
VDC from the negative terminal of the same fuse location to pin 7 of the modular jack. Use a full pair
for the power connections whenever possible, and do not use this fuse for any other devices. Each
device must have an individual power pair.
The total length of the twisted pair network cable must not exceed 7000 feet.
Hardware/Software Compatibility
The DXC901 software version is printed on the EPROM label installed on the PCB. When replacing
or upgrading the DXC901 it is not neccesary to reprogram the configuration.
The DXC901 is compatible with all software versions of TRIDEX processor, NFE1683.
Setting Network and Device Address - SW2
DIP switch SW2 is used to set the address of the DXC901. See S ETTING N ETWORK A DDRESS of
Chapter A - N ETWORK for a full description for setting addresses, as well as, an addressing chart.
The DXC901 is usually defined as node zero.