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Section 2– Teletilt

RET System Components in Detail Remote Electrical Downtilt System Handbook

2-6 May 2009 Bulletin 639519 • Revision D

2.7 AISG Smart Bias Tees

The AISG smart bias tees (Figures 2-10a and 2-10b) are

designed to eliminate the long AISG data cable run from the

base to the top of a cell site tower by electronically injecting

(piggy-backing) power and control signals onto an existing

RF coaxial run. Each installation requires a pair (top and

bottom unit) of smart bias tees. The top unit is installed at

the top of the tower, below the Teletilt RET (remote electrical

tilt) devices. The bottom unit is installed at the base of the

tower.

Each unit is equipped with a grounding stud that requires

use of a 602299 grounding kit to provide additional lightning

protection.

ATBT series smart bias tees shown in Figure 2-10a are AISG

1.1 compatible; whereas, the ATBT-S series shown in Figure

2-10b are both AISG 1.1 and 2.0 compatible. Both smart bias

tee families are RoHS compliant.

Figure 2-10a. ATBT Series

AISG 1.1 Smart Bias Tees.

Top Unit

ATBT-TOP-24V

Bottom Unit

ATBT-BOTTOM-24V

2.8 Portable Antenna System Controllers

Andrew has two portable antenna system controllers. The

discontinued ATC200-LITE controller (Figure 2-11) con-

nects to the PC serial port over an RS-232 serial cable.

The ATC200-LITE-USB controller (Figure 2-12) connects to

either a USB or a serial port on the PC.

Both units serve as an interface between a local PC/laptop

and the ATM200 RET actuator/antenna system.

Both units also provide signal level conversion from RS–232

(used on a PC) to RS–485 (used in ATM200 actuators), as

well as power to the actuators that are attached to the anten-

nas.

LEDs on the front panel of these units indicate power and

data communication. The power and system status LEDs are

green when power is supplied to the RET system. The data

LED is green when sending data to the RET system and is

usually followed by a tinge of red when receiving data from

the RET system. Refer to Figures 2-11, 2-13, and Table 2-3

for LED assignments.

Figure 2-10b. ATBT-S Series

AISG 1.1 and 2.0 Smart Bias Tees.

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 81 82

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