Symmetricom TimeHub 5500, User Manual

Page: 52 / 292

52 TimeHub 5500 User’s Guide 097-55501-01 Revision M – January 2009
Chapter 2 Engineering Ordering Information
Card Overview
The LED status indicators on the Clock card are described in Figure 2-5 .
Table 2-5. Clock Card Front Panel Indicators
Indicator Color Description
Power Green

On = The Clock card is receiving power

Off = No power present
Fuse Red

On = The Clock card fuse is open

Off = The Clock card fuse is not open
Alarm Red

On = An alarm condition is present

Off = No alarm condition is present
Fail Red

On = A hardware or firmware fault has occurred

Off = No hardware or firmware faults have occurred
Warmup Amber

On = Clock card is in Warmup state

Off = Clock card is not in Warmup state
Freerun Red

On = The Clock card is generating an output without
using tracking information from a reference source

Off = The Clock card is not in Freerun state
Tracking Green

On = The Clock card is tracking a qualified input

Off = The Clock card is not tracking a qualified input
Fast Track Green

On = The Clock card has warmed up, is tracking, and is
providing a usable output, but has not yet achieved
Smart Clock (optimal quality) output

Off = The Clock card is not in Fast Track state
SmartClock
Available Green

On = The system has gathered sufficient information
during tracking to provide Smart Clock (optimal quality)
holdover output if necessary

Off = The system has not gathered sufficient information
during tracking to provide Smart Clock (optimal quality)
holdover output if necessary
Holdover Green

On = All inputs are lost or unacceptable, and the system
is now using the internal oscillator which is using recent
tracking data from a qualified reference to provide the
output

Off = The system is not in Holdover state
Inputs E Green

On = The associated reference input is enabled (E) for
tracking

Off = The associated reference input is not enabled (E)
for tracking