Nortel DMS-100 Series Maintenance Manual page 28

1-12 Maintenance overview
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
297–8351–550 Standard 04.01 August 1999
D/A voice Balance
S1
Switch position
OFF ON
–3.5dB NL
X X
X X
X
X
X X
X
X X
S2
Both
OFF ON
9+2 1.3Vpp
X
X
X
X
X
Signaling level
S3 and S4
Only Only
S4 ON S3 ON
0.8Vpp 0.6Vpp
X
X
X
Both
OFF
0.14Vpp
X
X