Qpc471 clock controller card – Nortel Networks Circuit Card User Manual
Page 144
Page 144 of 906
Option settings
553-3001-211 Standard 3.00 August 2005
QPC471 Clock Controller card
Table 51 lists option settings for the QPC471 Clock Controller card.
Table 51
QPC471 vintage H
System
SW1
SW2
SW4
1
2
3
4
1
2
3
4
1
2
3
4
61C
on
on
on
on
off
off
off
off
off
on
*
*
81
off
off
off
off
off
off
off
off
off
on
*
*
81C
on
off
off
off
off
off
off
off
**
on
*
*
81C with Fiber Network
on
off
off
off
off
off
off
off
**
on
*
*
*Cable length between the J3
faceplate connectors:
0–4.3 m (0–14 ft)
off
off
4.6–6.1 m (15–20 ft)
off
on
6.4–10.1 m (21–33 ft)
on
off
10.4–15.2 m (34–50 ft)
on
on
*
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.