1-4
Cisco Cable Clock Card Hardware Installation Guide for the Cisco uBR7246VXR Universal Broadband Router
OL-26705-01
Chapter 1 Overview
LEDs
Figure 1-2
DB-15 T1 Clock Card Interface
Table 1-1
lists connector pinouts for the DB-15 T1 clock card interface.
LEDs
The clock card features “ACTIVE” and Loss of Service (“LOS”) status indicators for both the primary
and secondary clock source connectors. In addition, the clock card features single “ENABLE,”
“HOLDOVER,” “FREERUN,” and “FAULT” LEDs. (These LEDs are shown in
Figure 1-3
.)
Figure 1-3
LEDs on the Clock Card—Faceplate View
Table 1-2
describes the purpose and behavior of each LED on the clock card.
31596
ENABLE
HOLDOVER
PRI
Pin 9
Pin 1
Pin 3
Pin 11
Table 1-1
DB-15 T1 Clock Card Interface
Clock Card End
External Clock Source End
Pin
1
1.
Any pins not described in this table are not connected.
Note
Cisco provides DSU/CSU cables. You can use a DA-15 female to pigtail cable, 24.6 feet (7.5
m), CAB-SDS6 cable, COM-T1Product Number. For pinouts, refer to:
http://www.cisco.com/univercd/cc/td/doc/product/core/cis7505/ipicg/
Signal
Pin
Signal
1
Transmit Tip
3
Receive Tip
3
Receive Tip
1
Transmit Tip
9
Transmit Ring
11
Receive Ring
11
Receive Ring
9
Transmit Ring
31495
uBR - CLK-T1
ENABLE
HOLDOVER
FREERUN
FAULT
LOS
PRI
SEC
ACTIVE
