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INSTALLATION | 9
Hot Tip
Normally your telephone company should supply an RJ-11 style jack for the U interface.
This is the same 4 or 6-pin plug used for analog lines. However, sometimes you may nd an
8-pin RJ-45 style jack–and sometimes you may even be charged extra for it! If you have this
situation, an RJ-11 plug can be inserted into the center of an RJ-45 jack to make things work.
If you discover that the Telco charged you extra, be sure to request a refund!
ISDN Worldwide (outside the USA & Canada): The S/T Interface
e S-interface version of the Nx12 connects to the NT1 at one of its terminal jacks. e NT1
is sometimes generically called a NCTE (Network Channel Terminating Equipment) or, in
some countries an NTBA.
Nx12 S-Interface (RJ-45)
PIN DESCRIPTION
1 N/C
2 N/C
3 Transmit to network +
4 Receive from network +
5 Receive from network -
6 Transmit to network -
7 N/C
8 N/C
ISDN S-interface cable
Use only an 8-conductor RJ-45 style cable. Unshielded twisted pair category 3 or better cable
should be used.
ISDN S-Interface Cable (RJ-45)
PIN COLOR DESCRIPTION
1 White/Green PS3 power +/ground (optional)
2 Green PS3 power - (optional)
3 White/Orange Transmit to network +
4 Blue Receive from network +
5 White/Blue Receive from network -
6 Orange Transmit to network -
7 White/Brown PS 2 power - (optional)*
8 Brown PS 2 power +/ground (optional)*
TIA 568A Category 5 cable colors shown. Both ends are wired identically - not crossover.
* e NX12 does not use these power connections
When fully wired, this cable has 4 twisted pairs ‘straight through’ just as with cables used for
Ethernet. Both ends are wired identically. e outside pairs are not required and may be omit-
ted.