Accord XPC, Installation Manual, Page: 19 / 62

13
IE1-1230-B February 2001
Using cable suitable for connection to 2.8 mm diameter screw terminals, strip back
approximately 20 mm of the outer sheath and then remove approximately 4 mm of the
insulation from the wires to be connected to the Accord xpC.
Connect terminals 2 and 5 on the BT Master socket accross the A and B terminals (TB5)
on the Accord xpC, see figure 2.9 .
Example: The control panel enclosure must not be opened before isolating the mains
supply. Illumination of the green power LED indicates the presence of a.c.
mains supply. The cover of the Accord xpC enclosure must be replaced
whenever any connection to the BT master socket is completed to prevent
exposure to potentially lethal voltages from the PSTN.
Connecting Additional Telecom Apparatus
A BT Master socket, allowing additional telecom apparatus to be connected in series
with the Accord xpC can be connected to the TNV port PHONE (TB5) on the Accord
xpC, see figure 2.9 .
Note: The Accord xpC should be the first module on the line.
REN and SEN Numbers
It is possible to simultaneously connect a number of items to one line of the PSTN. The
limit is determined by summing the Ringer Equivalence Number (REN) shown on each
item of apparatus, ensuring that the sum of RENs is not more than four.
The REN of the Accord xpC is one (1).
Assume that all British Telecom equipment has a REN of one unless otherwise marked.
More than one item of series apparatus may be connected to the Accord xpC ports marked
phone. This is limited by summing the Series Equivalence Number (SEN) shown on each
item of series connected apparatus, ensuring that the sum of the SENs is not more than
one (1). The total series resistance, including cabling, must not exceed 50 Ohms.
Incoming
PSTN
Line
A B
Accord
XP
C PCB
PHONE
TB5
2
5
2
5
BT Master socket (
NTE5
/
CTE5
).
BT Master socket (
NTE5
/
CTE5
).
Figure 2.9. Connecting the Accord
XP
C to the PSTN
Note: Terminals 2 and 5 on the BT Master Socket should be hard-wired to the A and B terminals (TB5)
on the Accord xpC. This connection is polarity independant.
It is strongly recommended that the Accord xpC panel is the only device on the line.
If another device is to be connected to the line, connect PHONE terminals on the Accord xpC
PCB to terminals 2 and 5 on a second BT Master Socket