Nortel DMS-100 Series Maintenance Manual page 31

Recommended NT6X21AD S1 DIP switch settings
Recommended
application
switch position
ON
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
Northern
Telecom
UDLCs
Other vendors
UDLCs
6X21AC
equivalent
mode
Note: dB=decibel
NL = non-loaded
9+2=loaded (900 ohm + 2.16 micro-farads) network
Vpp=voltage peak to peak
EML= estimated measured loss, as defined in NTP 297-2011-180 BCS35 version 01.02
The following two tables list the two acceptable limits for transhybrid loss
(THL) that depend on the D/A level selected. The NT6X21AD uses the
same diagnostics as the NT6X21AC. This use causes the modification of the
THL limits for diagnostic purposes. The first table is for the NT6X21AC
line card and the second table is for the NT6X21AD line card.
D/A voice Balance
S1
switch position
OFF ON
–3.5dB NL
X X
X X
X
X
X X
X
X X
DMS-100 Family OPAC Maintenance Manual XPM12 and up
Signaling level
S2
Both
OFF ON
9+2 1.3Vpp
X
X
X
X
X
Maintenance overview 1-15
S3 and S4
Only Only Both
S4 ON S3 ON OFF
0.8Vpp 0.6Vpp 0.14Vpp
X
X
X
X
X