Telos NX12 User Manual download pdf (Page 19)

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.

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Telos NX12 User Manual Page 19