3-34 L30 Line Current Differential System GE Multilin3.3 PILOT CHANNEL COMMUNICATIONS 3 HARDWARE36. Replace the top cover and the cover screw.7. 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 asthe module is smoothly inserted into the slot. Once the clips have cleared the raised edge of the chassis, engage theclips simultaneously. When the clips have locked into position, the module is fully inserted.Figure 3–34: G.703 TIMING SELECTION SWITCH SETTINGc) G.703 OCTET TIMINGIf octet timing is enabled (ON), this 8 kHz signal is asserted during the violation of bit 8 (LSB) necessary for connecting tohigher order systems. When L30s are connected back-to-back, octet timing is disabled (OFF).d) G.703 TIMING MODESThere are two timing modes for the G.703 module: internal timing mode and loop timing mode (default).• Internal Timing Mode: The system clock is generated internally. Therefore, the G.703 timing selection should be inthe 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 to 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 selectionshould be in loop timing mode for connections to higher order systems. For connection to a higher order system (UR-Table 3–5: G.703 TIMING SELECTIONSSWITCHES FUNCTIONS1 OFF → octet timing disabledON → octet timing 8 kHzS5 and S6 S5 = OFF and S6 = OFF → loop timing modeS5 = ON and S6 = OFF → internal timing modeS5 = OFF and S6 = ON → minimum remote loopback modeS5 = ON and S6 = ON → dual loopback modeCover screwTop coverBottom coverEjector/inserter clipEjector/inserter clipTiming selectionswitchesChannel 1Channel 2FRONTREAR831774A3.CDR
