2N Omega Lite - Installation Manual v1.5 - Manual (Page 18)

2N
®
- OMEGA Lite
Installation manual
Installation manual
18
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5.2. Module 2x system telephone (order No 1880039)
This is a four-wire interface, which must be respected for designing circuits
around the building. The conductors A-B used for call transmission are without DC
potential. The conductors C-D serve for data transmission and also supply the
system telephone with voltage -24V. Both pairs are strictly symmetrical, which
minimises rf radiation and also ensures good resistance to line cross-talk. When the
RJ-45 connector is connected, A-B represents the internal pair and C-D represents
the external pair.
J1 - motherboard connector (or for extender module (the connector is
ensured against incorrect connection by the blanking of PIN 5,6,7,8).
J2 - connector RJ-45 (A-B = PIN 4-5, C-D = PIN 6-3) for connecting
system line (PORT 1).
J3 - connector RJ-45 (A-B = PIN 4-5, C-D = PIN 6-3) for connecting
system line (PORT 2).
J4 - company’s servicing reanimation connector (SW for ALTERA).
D1
- signalling LED ( communication SYS PORT 1).
D2 - signalling LED ( communication SYS PORT 2).