Qpc471 Clock Controller Card - Nortel Circuit Card Installation Manual

Page 144 of 906

QPC471 Clock Controller card

Table 51
QPC471 vintage H
System
61C
81
81C
81C with Fiber Network
* If there is only one Clock Controller card in the system, set to OFF. If there are two Clock Controller
cards, determine the total cable length between the J3 connectors (no single cable can exceed 25 ft.)
and set these two switch positions for this cable length, as shown above. The maximum total (combined)
length is 50 ft. Set the switches on both cards to the same settings.
** Set to ON for clock controller 0. Set to OFF for clock controller 1.
Note: FNF based-systems the total clock path length is equal to the length of the NTRC49
cable used to connect between the two clock controller cards.
553-3001-211 Standard 3.00
Option settings
Table 51 lists option settings for the QPC471 Clock Controller card.
SW1
1 2
on on
off off
on off
on off
August 2005
SW2
3 4 1 2
on on off off
off off off off
off off off off
off off off off
*Cable length between the J3
faceplate connectors:
0–4.3 m (0–14 ft)
4.6–6.1 m (15–20 ft)
6.4–10.1 m (21–33 ft)
10.4–15.2 m (34–50 ft)
SW4
3 4 1 2
off off off on
off off off on
off off ** on
off off ** on
3 4
* *
* *
* *
* *
off off
off on
on off
on on