Nortel Communication Server 1000S Installation And Configuration Manual page 209

Table 65
Clock Controller switch settings for QPC471 vintage H
System
Half Group, Single Group
Option 81
Multi Group (with the
exception of Option 81)
Multi Group 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.
Table 66
Clock Controller switch settings for QPC775
System
Half Group, Single Group
Multi Group
Clock Controller description and installation
SW1
1 2 3 4
on on on on
off off off off
on off off off
on off off off
SW2
ON
OFF
ISDN Primary Rate Interface
SW2
1 2 3 4
off off 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)
SW3
OFF
OFF
Installation and Configuration
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SW4
1 2 3 4
off on * *
off on * *
** on * *
** on * *
off off
off on
on off
on on
SW4
ON
ON