Park Air Systems 6525, User Documentation

Page: 43 / 54

31-3MDR00HB Page 43 Installation
Draft
Facilities Connector
A 25-way D-type filtered socket providing analogue and HDLC interfaces. The connector is shown in
Fig 10 and the pin-out listed in Table 11. A suitable 25-way D-type plug to connect to this interface is
listed in
Table 9 on page 39 .
Fig 10 Facilities Connector Pin-out
Table 11 Facilities Connector
Pin Signal Name Characteristic Input or Output
1 Ground 0 V.
2 Line in – Balanced 600 ohm, -20 to +10 dBm.
Phantom Keying:
Phantom PTT active when the input differs from the
reference by more than 10 V. Reference voltage
(common to PTT input on pin 25) is programmable to
+14, 0 or -14 V (all ±1 V).
Phantom PTT inactive when the input differs from the
reference by less than 1 V
Maximum input level ±60 V with respect to reference.
Input requires at least 1 mA to operate and draws no
more that 6 mA.
Configurable active high or low.
Input
3 Signal strength Between 0 and 5 V. Output
4
Line out
+
Balanced 600 ohm, -20 to +10 dBm. Output
5 Ground 0 V.
6 HDLC 0 TX B RS422 differential synchronous data at 128 kbits per
second. Output
7 HDLC 0 RX B RS422 differential synchronous data at 128 kbits per
second. Input
8 HDLC 0 CL B RS422 differential synchronous data at 128 kbits per
second. Output
9 HDLC 1 TX B RS422 differential synchronous data at 128 kbits per
second. Output
10 HDLC 1 RX B RS422 differential synchronous data at 128 kbits per
second. Input
continued ...
13 1
25 14