Nortel DMS-100 Series Replacement Procedures page 932

1-900 XPM card replacement procedures
NT6X21
in an RSC-S (DS-1) Model B LCME
Recommended NT6X21AD S1 DIP switch settings
Switch position
ON
Recommended
application 0dB
P-phone sets
long loop:
19-24dB EML
P-phone sets
medium loop:
17-19dB EML
P-phone sets
medium loop:
4-17dB EML
P-phone sets
short loops:
0-4dB EML
Nortel UDLCs
Other vendors
UDLCs
6X21AC
equivalent mode
Note: dB=decibel, NL=nonloaded, Vpp=voltage peak to peak, EML=estimated measured loss, as
defined in NTP 297-2011-180, BCS35 version 01.02
297-8021-547 Standard 14.02 May 2001
b Make DIP switch changes to the replacement NT6X21AD card to match
DIP switch settings of the card being replaced, or as defined in the
following table.
D/A voice S1 Balance S2
Switch position
OFF ON
-3.5 dB NL
X
X
X
X
X
X
X
c Slide the card in the shroud guide slots toward the drawer backplane.
d Hold the front cover of the line drawer with your left hand to steady it.
e Grasp the top and bottom edges of the card with the fingers of your right
hand.
f Push the card toward the backplane until it plugs fully into the backplane
socket.
(continued)
Signaling levels S3 and S4
Both
OFF ON
1.3
9+2 Vpp
X X
X
X
X
X
X
X X
Both
S4 ON S3 ON OFF
0.8 0.6 0.14
Vpp Vpp Vpp
X
X
X
X
X