User's Manual

MIRCU User Manual

Figure 9 Mapping of MIRCU-S24 to Phase Shifter

6.4 MIRCU Control Cable, Lightning Protection and

Grounding cables

6.4.1 Control cable, Lightning Protection and Grounding requirements

MIRCU control cable can connect through SBT or TMA (as shown in Figure 6 (b), (c)),

normally control cable will be short and not more than 2m, lighting protection and grounding

will be implemented along the RF feeder and hence it is not necessary for control cable to

carry out lightning Protection and grounding again.

However, if MIRCU and control cable are connected as Figure 6 (a), whereby control cable

connect to RCU directly, then it is necessary for the cable control to proceed with Lightning

Protection and Ground requirement. Details as follows:

a) Control cables that connect to base station antenna should be within the scope of

protection of the air terminals. Air terminals shall establish special lightning current

deflectors, materials suitable are 4mm x 40 mm galvanized flat steel.

b) Control cables metal sheath should be clamp to grounding kit within 1m of antenna,

1m within the cable tray at the bottom of the tower, and 1m before entering base

station shelter. Make sure grounding cable is installed property, feeder window of the

shelter room should be close to the ground and properly connect to the grounding bar

that leads to the ground. (See Figure 10)