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Section 2– Teletilt

RET System Components in Detail Remote Electrical Downtilt System Handbook

2-4 May 2009 Bulletin 639519 • Revision D

Pin Number Signal Comments

1 +12V dc nominal +10V to 15V dc (optional in AISG 2.0)

2 –48V dc nominal Use is optional. Not used in the Andrew RET system.

3 RS–485 B RS–485 communication

4 RS–485 GND Use is optional. Isolated from dc return and ground.

5 RS–485 A RS–485 communication

6 +24V dc nominal +19V to 30V dc (AISG 1.1) / +10V to 30V dc (AISG 2.0)

7 dc return Not grounded for RET units.

8 N/C Reserved for future use. Not used in the Andrew RET system.

Table 2-2. AISG Compliant RET Connector Pin Definitions.

Male Female

Figure 2-5. AISG Compliant Andrew RET Connector Pin Assignments.

Keys to ensure proper connection.

2.3 Junction Boxes

Andrew’s four–way and seven–way junction boxes are used to de-

vide or split the AISG bus, e.g. one cable line per sector. The ATJB-

00-A01-004 four-way junction box has 1 input port and 4 output ports

and the ATJB200-A01-007 seven-way junction box has 1 input port and

7 output ports. Both the four–way and seven–way junction boxes are

pipe or wall/ﬂ at surface mountable (mounting brackets are included).

These units also provide additional lightning protection. See Figure

2-6.

Figure 2-6. ATJB200-A01-004

Four–Way Junction Box.

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