751221
12
Standalone Telephone Unit
Note
1.
This unit can be powered by 120 V ac or a DC voltage source of
24 V dc to 130 V dc (maximum of 150 V dc).
2.
The input power is not polarity sensitive.
3.
The power connections are made at TB1 on the power supply board
(see Power & Ground Connections in the figure).
4.
J4 connects the -24 V dc output of the power supply to the Station
side main board.
5.
This unit contains an internal standby battery, which may be
removed if this internal backup power supply is not required.
6.
The station ground must be connected to the unit by either TB1
terminal 2 of the power supply board or the external ground lug
connection. It must not be connected to both to avoid inductive
loop.
7.
Both TB1 terminal 2 and the external ground lug connection may
be used to provide a common ground, as long as ground loop
limitations are recognized. (GND LUG is the preferred way of
grounding).
8.
The Tip and Ring of the Station side are connected to TB2.
9.
The loop voltage supplied to the Station side telephone is 24 V dc.
10. The Tip and Ring of the CO side are connected to TB1 of the CO
side main board.
11. The RMT GND on the CO side is shown as a reference only and is
not normally connected.
12. Do not connect the incoming cable shield to the RMT GND.
13. The unit is usually mounted with the Station side up, but may be
mounted in any position.
Summary of Contents for Teleline 751221
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