
132 NT5D97 Dual-port DTI2/PRI2 installation and removal
Receiver impedance
A per-trunk set of four DIP switches (S8/S14 provides selection between
75 or 120 ohm values. Refer toTable 41 "Trunk interface impedance switch
settings" (page 132).
Table 41
Trunk interface impedance switch settings
Description
S8/S14 switch setting
75 ohm OFF OFF ON OFF
120 ohm
OFF OFF OFF ON
Ring ground switches for NT5D97AA/AB
A set of four DIP switches (S2) selects which Ring lines are connected to
the ground. Refer to Table 48 "LBO switches for NT5D97AD" (page 136).
Table 42
Ring ground switch settings
Switch
Description
S2 switch settings
1
Trunk 0 Transit
OFF-Ring line is not grounded
ON- Ring line is grounded
2
Trunk 0 Receive
OFF-Ring line is not grounded
ON- Ring line is grounded
3
Trunk 1 Transmit
OFF-Ring line is not grounded
ON- Ring line is grounded
4
Trunk 1 Receive
OFF-Ring line is not grounded
ON- Ring line is grounded
DCH Address select switch for NTBK51AA daughter board for
NT5D97AA/AB
In case of an onboard NTBK51AA D-channel daughterboard, a set of four
switches (S3) provide the daughterboard address. Refer to Table 50 "Trunk
1 switches" (page 137).
Note: Switch 8 of S3 (S3-8) does not require a switch setting to
select between the onboard NTBK51AA D-channel daughterboard
and an external DCHI/MSDL. The NT5D97 detects when the onboard
NTBK51AA D-channel daughterboard is used.
Nortel Communication Server 1000
ISDN Primary Rate Interface Installation and Commissioning
NN43001-301 02.03 Standard
Release 5.5 7 December 2007
Copyright © 2003-2007, Nortel Networks
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