Rs422 & Fiber Interface; Fiber Interface - GE UR Series Instruction Manual

3.3 L90 CHANNEL COMMUNICATION
The following figure shows the combined RS422 plus Fiber interface configuration at 64K baud. The 7L, 7M, 7N, 7P, and
74 modules are used in 2-terminal with a redundant channel or 3-terminal configurations where Channel 1 is employed via
the RS422 interface (possibly with a multiplexer) and Channel 2 via direct fiber.
AWG 22 twisted shielded pair is recommended for external RS422 connections and the shield should be grounded only at
one end. For the direct fiber channel, power budget issues should be addressed properly.
When using a LASER Interface, attenuators may be necessary to ensure that you do not exceed Maximum
Optical Input Power to the receiver.
WARNING
3
The following figure shows the combined G.703 plus Fiber interface configuration at 64K baud. The 7E, 7F, 7G, 7Q, and 75
modules are used in 2-terminal with a redundant channel or 3-terminal configurations where Channel 1 is employed via the
G.703 interface (possibly with a multiplexer) and Channel 2 via direct fiber. AWG 22 twisted shielded pair is recommended
for external G.703 connections connecting the shield to Pin # 1A at one end only. For the direct fiber channel, power budget
issues should be addressed properly. See more details related to G.703 and fiber interfaces in previous sections of this
chapter.
When using a LASER Interface, attenuators may be necessary to ensure that you do not exceed Maximum
Optical Input Power to the receiver.
WARNING
3-28
W 3b
Tx1 -
W 3a
Rx1 -
W 2a
Tx1 +
W 4b
Rx1 +
W 6a
Shld.
Tx2
Rx2
W
7a
+
W 8b
-
W
2b com
W 8a
Figure 3–33: RS422 & FIBER INTERFACE CONFIGURATION
1a
X Shld.
X 1b Tx -
X
2a Rx -
X 2b Tx +
X
3a
Rx +
X
3b
Tx2
Rx2
Figure 3–34: G.703 & FIBER INTERFACE CONFIGURATION
L90 Line Differential Relay
3.3.6 RS422 & FIBER INTERFACE
RS422
CHANNEL 1
FIBER
CHANNEL 2
CLOCK
(CHANNEL1)
SURGE
L907LMNP.CDR
P/O 827831A6.CDR
3.3.7 G.703 & FIBER INTERFACE
G.703
CHANNEL 1
SURGE
FIBER
CHANNEL 2
G703.CDR
P/O 827831A7.CDR
3 HARDWARE
GE Power Management