User's Manual

260-668066-003 Rev 002 October 2001 5-5
Eclipse Installation Manual
• For a -48 Vdc supply, connect the blue wire to -48 Vdc (live), and the black wire
to ground/+ve.
• For a +24 Vdc supply, connect the blue wire to +24 Vdc (live), and the black wire
to ground/-ve.
- For +24 Vdc operation the associated INU/INUe must be fitted with a PCC to
convert +24 Vdc to - 48 Vdc.
• For NEBS compliance the battery return connection is to be treated as an isolated DC
return (DC-I), as defined in GR-1089-CORE.
• An integral DC/DC converter provides polarity protection, under/over voltage
shutdown, over-current limit, and thermal shutdown.
• NEBS compliant EMI filtering is included.
• There are no serviceable fuses.
DC power connector can be shorted inadvertently if applied at an angle.
Always insert with correct alignment.
The DC power supply must be SELV compliant (maximum limited 60
Vdc).
Insertion Loss Labels
Labels on the ACU provide factory-measured insertion loss data. The top label lists the
loss for each filter and circulator. A front label lists the total loss through the ACU
(filters, circulators, cables, plus any protection components, such as Tx switch and
couplers). Total (combined) loss figures are entered into Portal to enable computation
of Tx power and RSL figures at the ACU antenna waveguide port(s) based on the RFU
measured values of Tx power and RSL.
For IRU 600v2 an additional label shows the insertion loss of the Tx monitoring port.
The value must be taken into account when measuring output power with a power
meter.
Expansion Port
The expansion port allows system expansion through the addition of co-located IRU
600 radios, or external radio equipment.
• When multiple carriers are deployed on a common branching network (same
antenna), the intermodulation frequency products that result from combining two or
more transmitter frequencies on a common antenna feeder must be 48 MHz or more
above or below each of the receiver frequencies present on the same antenna feeder.