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Cisco Cable Clock Card Hardware Installation Guide for the Cisco uBR7246VXR Universal Broadband Router
OL-26705-01
Chapter 1 Overview
Clock Card Location in the Cisco uBR7246 VXR Chassis
Clock Card Location in the Cisco uBR7246 VXR Chassis
The chassis slot of the Cisco uBR7246 VXR chassis into which the clock card can be installed is on the
left side of the chassis immediately below port adapter slot 1.
Figure 1-4
shows a Cisco uBR7246 VXR
with the clock card installed.
Table 1-2
Clock Card LED Descriptions
LED
Color
Description
LOS (Primary)
Yellow
Indicates that the clock card has lost contact with the primary
external clock source.
LOS (Secondary)
Yellow
Indicates that the clock card has lost contact with the secondary
external clock source.
ACTIVE (Primary)
Green
Indicates that the clock card is currently locked to the primary
external clock source signal.
ACTIVE (Secondary)
Green
Indicates that the clock card is currently locked to the secondary
external clock source signal.
ENABLE
Green
Indicates that the clock card is correctly installed in and
recognized by the Cisco uBR7246 VXR chassis.
HOLDOVER
Yellow
Indicates that the clock card has lost contact with the current
primary and/or secondary external clock source(s) and has
entered holdover mode. This means that the clock card was
locked to an external clock signal for at least 25 seconds before
losing contact and has temporarily become the clock source for
the Cisco uBR7246 VXR.
FREERUN
Yellow
Indicates that the clock card has lost contact with both the
primary and secondary external clock sources and has
inadequate storage from prior connection to enter holdover
mode. Unlike holdover mode, entering freerun mode means that
the clock card was initially unable to lock on to either a primary
or secondary external clock signal.
Note
Freerun mode is most commonly encountered at startup
when the clock card is unable to recognize an external
clock source.
FAULT
Amber
Indicates a hardware failure with the clock card circuitry.
