Phone jack pinout assignments – ZyXEL Communications Omni TA128 User Manual

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Phone Jack Pinout

Assignments

The TA128 features one RJ-45 phone jack and two RJ-11 phone
jacks. The RJ-45 labeled “ISDN S” jack is for ISDN line
connection (S/T interface), and the RJ-11 jack labeled “PHONE”
(also known as an analog adapter in European countries) is for an
optional connection to analog telephone equipment such as a
telephone set, answering machine, fax machine or analog modem.

RJ-45 Connector for the S/T Interface Model

1. Not Connected
2. Not Connected
3. RCV +
4. XMT +
5. XMT -
6. RCV-
7. -48V
8. -48V RTN

RJ-45 Connector for the U Interface Model

1. Not Connected
2. Not Connected
3. Not Connected
4. Ring
5. Tip
6. Not Connected
7. -48V
8. -48V RTN

RJ-11 Analog Adapter (Phone 1&2)

1. Not Connected
2. Ring
3. Tip