3.8.2 Parallel Connection of the Extensions
Any SLT can be connected in parallel with an APT or a DPT as follows.
Note
In addition to an SLT, an answering machine, a fax machine or a modem (PC) can be connected in parallel
with an APT or a DPT.

With APT

For parallel connection, eXtra Device Port (XDP) mode must be disabled for that port through system
programming. Refer to "13.1.2 Paralleled Telephone" and "5.1.7 Extension Port Configuration" in the Feature
Manual for further information.
To DHLC4 card
4-conductor wiring cord
Connect pins "T", "R", "D1",
and "D2".
2-conductor wiring cord
Connect pins "T" and "R".
SLTAPT
Modular
T-Adaptor
90 Installation Manual Document Version 2011-10
3.8.2 Parallel Connection of the Extensions