GE L90 Instruction Manual page 70

Line differential relay ur series
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3.3 L90 CHANNEL COMMUNICATION
6.
Re-insert the G.703 module Take care to ensure that the correct module type is inserted into the correct slot position.
The ejector/inserter clips located at the top and at the bottom of each module must be in the disengaged position as
the module is smoothly inserted into the slot. Once the clips have cleared the raised edge of the chassis, engage the
clips simultaneously. When the clips have locked into position, the module will be fully inserted.
3
Table 3–4: G.703 TIMING SELECTIONS
SWITCHES
FUNCTION
OFF → Octet Timing Disabled
S1
ON → Octet Timing 8 kHz
S5 = OFF and S6 = OFF → Loop Timing Mode
S5 and S6
S5 = ON and S6 = OFF → Internal Timing Mode
S5 = OFF and S6 = ON → Minimum Remote Loopback Mode
S5 = ON and S6 = ON → Dual Loopback Mode
c) OCTET TIMING (SWITCH S1)
If Octet Timing is enabled (ON), this 8 kHz signal will be asserted during the violation of Bit 8 (LSB) necessary for connect-
ing to higher order systems. When L90's are connected back to back, Octet Timing should be disabled (OFF).
d) TIMING MODES (SWITCHES S5 AND S6)
Internal Timing Mode: The system clock generated internally. Therefore, the G.703 timing selection should be in the
Internal Timing Mode for back-to-back (UR-to-UR) connections. For Back to Back Connections, set for Octet Timing
(S1 = OFF) and Timing Mode = Internal Timing (S5 = ON and S6 = OFF).
Loop Timing Mode: The system clock is derived from the received line signal. Therefore, the G.703 timing selection
should be in Loop Timing Mode for connections to higher order systems. For connection to a higher order system (UR-
to-multiplexer, factory defaults), set to Octet Timing (S1 = ON) and set Timing Mode = Loop Timing (S5 = OFF and S6
= OFF).
3-24
Figure 3–26: G.703 TIMING SELECTION SWITCH SETTING
L90 Line Differential Relay
3 HARDWARE
GE Multilin

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