Functional Description; Timing Insertion Module Status Indicators - Symmetricom TSG-3800 Series User Manual

Output Modules
Timing Insertion Module
Table 7-52 describes the status indicators (LEDs) located on the front panel of the
TIM.
Table 7-52. Timing Insertion Module Status Indicators
Indicator
POWER
BYPASS
E SLIP
A
OOF
S
T
LOS
AIS
FAULT
W OOF
E
LOS
S
T
AIS

Functional Description

Refer to Figure 7-26
data stream and re-clocks it with the TSG-3800 system clock. The data stream is
passed through a frame (386 bit) buffer.
The TIM modules can be set for D4 or ESF framing, and for AMI or B8ZS mode
through the PCB jumper blocks on each module. The DS1 line-interface signal on
the output can be adjusted to compensate for the cable length.
Clock signals from each of the two Clock/Frame Generator Module pairs are
brought onto each TIM card. Under normal operation the TIM will use the input from
the 'A' Clock/Frame Generator. If the selected pair fails, the TIM will automatically
switch to the other pair of modules. A phase lock loop (PLL) filters the clock feed, so
that when the TIM switches from one Clock Module to the other, the re-timed output
will shift less than ±324 ns at a rate which never exceeds 81 ns change in a 14 ms
interval (per ANSI T1.101). If both clock inputs fail, a MAJOR alarm will be
generated, and the signal will be passively by-passed.
The TIM monitors the outgoing DS1 signal and if it fails, the by-pass relays are
activated and the DS1 line is routed around the module.
280 TSG-3800 User's Guide
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Color
Green On = Power is applied
Red On = Re-timing function bypassed by relays
Red On = A slip occurred (latching)
Red On = 2 out of 4 consecutive framing bits in error
Red On = Loss of Signal
Red On = Alarm Indication from Source
Red On = Hardware failure of transmitter
Red On = 2 out of 4 consecutive framing bits in error
Red On = Loss of Signal
Red On = Alarm Indication from Source
for the following functional discussion. The TIM accepts a DS1
Description
12778474-002-2 Revision F – March 2004