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3000 Series User Guide 17
4. Connect one end of an ISDN cable to the NT1 U interface port and the
other end to the ISDN wall jack. The ISDN cable for this connection is
dependent on your NT1 device.
Setting the S/T Switch
There is an S/T switch on the ISDN S/T module. You can slide the switch to 0
or 1. Setting the switch to 0 means that no terminating resistor is in use.
Setting the switch to 1 means that the ISDN S/T module terminates the ISDN
cable with a 100-ohm resistor.
For point-to-point connections (shown in the following figure), set the switch
to 1. For all other configurations, consult your NT1 manual for the proper
setting. In a point-to-point connection, there is one ISDN device on an ISDN
line.
3000 Series
3000 Series
VO
I
C
E
OICE
V
1
V1
D
1
D1
D
2
D2
D
3
D3
E
T
H
ETH
V
2
V2
V
3
V3
V
4
V4
DATA
A
L
M
ALM
O
K
OK
P
W
R
PWR
Internet or
Other WAN
Telephone
Fax
NTI
D
01
ISDN S/T
B1
B2
S/T Switch