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Installing and wiring telephones and trunks
100 Installing and Connecting the MDF and Telephones
4. Connect a 25-pair cable between the male RJ21 25-pair connector on the Emergency
Transfer Panel and the yellow field of the MDF. Table 18: Pin assignments for 25-pair
connector on page 101 shows the pinouts.
5. Make cross-connections for each emergency trunk/emergency station pair.
The 808A is connected to the MDF by means of a B25A cable. Figure 49: Connections for
telephone used for emergency transfer on page 103 shows the connections at the trunk/
auxiliary field for a telephone used only for emergency transfer.
Figure 50: Connections for telephone used for emergency transfer and as normal
extension on page 104 shows the connections at the trunk/auxiliary field for a telephone
used for emergency transfer as well as a normal extension.
The auxiliary field for a G650 connects via the DB9 alarm cable to the TN2312BP adapter in
the “A” carrier only. See Figure 42: IPSI-2 cabling
on page 88 and Figure 43: Sample
Issue 1 IPSI-2 alarm cable connectivity on page 89.
6. On the trunk identification label at the bottom of the panel, record the trunk line, extension,
and location for each circuit.
7. To each telephone designated as an emergency terminal, attach a label identifying it as
such. The labels are provided with the unit.
8. Check for normal operation as follows:
● Place the test switch (switch 12) in NORMAL OPERATION.
● Ensure the power supply is providing -48 VDC at 80 mA maximum. The power LED
should be ON.
● Check wiring connections.
● Verify there is dial tone on all emergency transfer sets.
If all of the above conditions are not met, remove the panel from service and replace it with
a new panel.
9. Check for transfer operation as follows:
● Place the test switch (switch 12) in the ACTIVATED position.
● The power LED should be OFF.
● Verify there is dial tone on all emergency transfer sets.
If all of the above conditions are not met, remove the panel from service and replace it with
a new panel.