Interface - GE UR Series Instruction Manual
Line differential relay
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Also See for UR Series:
- Instruction manual (652 pages) ,
- Manual (433 pages) ,
- Release notes (33 pages)
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3.3 L90 CHANNEL COMMUNICATION
a) DESCRIPTION
The following figure shows the 64K ITU G.703 co-directional interface configuration. For 2-Terminal configurations, channel
2 is not used.
AWG 22 twisted shielded pair is recommended for external connections, with the shield grounded at only at one end. Con-
necting the shield to Pin # X1a or X6a grounds the shield since these pins are internally connected to ground. Thus, if Pin #
X1a or X6a is used, do not ground at the other end.
This interface module is protected by surge suppression devices.
3
The following figure shows the typical pin interconnection between two G.703 interfaces. For the actual physical arrange-
ment of these pins, see the REAR TERMINAL ASSIGNMENTS section earlier in this chapter. All pin interconnections are
to be maintained for a connection to a multiplexer.
G.703
CHANNEL 1
SURGE
G.703
CHANNEL 2
SURGE
Figure 3–25: TYPICAL PIN INTERCONNECTION BETWEEN TWO G.703 INTERFACES
Pin nomenclature may differ from one manufacturer to another. Therefore, it is not uncommon to see
pinouts numbered TxA, TxB, RxA and RxB. In such cases, it can be assumed that "A" is equivalent to "+"
NOTE
and "B" is equivalent to "–".
b) G.703 SELECTION SWITCH PROCEDURE
Step 1:
Remove the G.703 module (7R or 7S):
The ejector/inserter clips located at the top and at the bottom of each module, must be pulled simultaneously in
order to release the module for removal. Before performing this action, control power must be removed from
the relay. The original location of the module should be recorded to help ensure that the same or replacement
module is inserted into the correct slot.
Step 2:
Remove the module cover screw.
3-22
X
1a
Shld.
X
1b
Tx -
X
2a
Rx -
X
2b
Tx +
X
3a
Rx +
X
3b
X
6a
Shld.
X
6b
Tx -
X
7a
Rx -
X
7b
Tx +
X
8a
Rx +
X
8b
Figure 3–24: G.703 INTERFACE CONFIGURATION
X
1a
Shld.
X
1b
Tx -
X
2a
Rx -
X
2b
Tx +
X
3a
Rx +
3b
X
X
6a
Shld.
X
6b
Tx -
7a
X
Rx -
X
7b
Tx +
X
8a
Rx +
8b
X
L90 Line Differential Relay
G.703
CHANNEL 1
SURGE
G.703
CHANNEL 2
SURGE
X
1a
Shld.
X
1b
Tx -
X
2a
Rx -
X
2b
Tx +
X
3a
Rx +
3b
X
X
6a
Shld.
X
6b
Tx -
7a
X
Rx -
X
7b
Tx +
X
8a
Rx +
8b
X
3 HARDWARE
3.3.4 G.703 INTERFACE
G.703
CHANNEL 1
SURGE
G.703
CHANNEL 2
SURGE
GE Power Management
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