Functional Description - Symmetricom TSG-3800 Series User Manual

CPU, Frame Generator, and Clock Modules
CPU Module
Table 6-1. CPU Module Indicators (Continued)
Indicator
CPU
SYS
MAJOR
COMM ACTIVE A
COMM ACTIVE B
ENET
Push the ALARM CUTOFF switch on the front panel to turn off the AUDIO alarm.
This does not clear the alarm condition. Correcting the alarm condition deactivates
the MAJOR or MINOR local and remote contacts and turns off the corresponding
indicators. The ALARM CLEAR command also turns off the audio alarm as well as
the MAJOR and MINOR alarm indicators.

Functional Description

Refer to Figure 6-2
module contains a microprocessor that performs measurements, monitors for
errors, and collects data. Two EIA-232 ports allow the microprocessor to
communicate with the operator. One port is on the CPU Module front panel, the
other is on the rear panel of the main shelf.
The processor determines when an alarm condition exists and activates the
appropriate relays. This module accepts an external command for resetting the
AUDIO alarm contacts.
Power A and B on the main shelf provide power to the module. These redundant
sources of –48 vDC are diode-coupled and fused, allowing the module to draw
power from either source. The internal fuse labeled F1 protects the circuitry from
excessive current. The DC-to-DC Converter changes the negative voltage into +5
vDC; the green POWER indicator on the front panel is lit when either power source
is available to the module. The POWER indicator turns off when power is lost, for
example if the fuse on the module opens, if both –48 vDC power inputs are lost, or if
the converter fails.
172 TSG-3800 User's Guide
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Color
Red On = Microprocessor has malfunctioned. This
condition causes a major alarm.
Red On = A hardware fault within the TSG system. This
condition causes a major alarm.
Red On = Loss of synchronization. Immediate action
required
Green On = Front panel EIA-232 port is in use. This
indicator on only during data transfer.
Green On = Rear panel EIA-232 port is in use. This
indicator is used only during data transfer.
Green On = Ethernet packets transmitted or received.
for the following functional discussion of the CPU module. This
Description
12778474-002-2 Revision F – March 2004