Circuit Pack Descriptions
7-116 Issue 8.0 July 2002
Synchronization 7
TG3 (DS1) (LAA18) Circuit Pack Description 7
Purpose of Circuit 7
The Timing Generator, Stratum 3 - DS1 [TG3 (DS1)] circuit pack provides the
OC48 Transmitter (OC48 TRMTR), DS3 Interface (DS3), and STS1 Electrical
Interface (STS1E) circuit packs with their required timing signals. The LAA17 TG3
(DS1) circuit pack has been discontinued and replaced with the LAA18 TG3 (DS1)
circuit pack. The LAA18 TG3 (DS1) circuit pack is compatible with
Releases 2.1.1-TRM and later software.
Faceplate LED 7
The TG3 (DS1) circuit pack has a red FAULT LED on its faceplate (Figure 7-34).
The red FAULT LED is lighted when a circuit pack failure is detected or when the
circuit pack loses power. If the circuit pack loses power, a separate path is
provided for power from the Line Controller (LNCTL) circuit pack to light the
FAULT LED on the TG3 (DS1) circuit pack.
Figure 7-34. TG3 (DS1) (LAA18) Circuit Pack
FAULT
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LAA18
TG3
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