Chapter 2: System hardware 118
Note
A CMM3 cannot be used to power up a 450i or 450m Series ODUs.
Installing a GPS receiver
To install a GPS receiver as the timing reference source, use the following procedures:
l Mounting the GPS receiver
l Cabling the GPS Antenna
l Installing and connecting the GPS LPU
Caution
Prior to power- up of equipment, ensure that all cables are connected to the
correct interfaces of the CMM4 unit and the UGPS receiver module. Failure to do
so may result in damage to the equipment.
GPS receiver location
Mount the GPS receiver at a location that meets the following requirements:
l It must be possible to protect the installation as described in Grounding and lightning protection.
l It must have an un-interrupted view of at least half of the southern (resp. northern) sky in the
northern (resp. southern) hemisphere. For a receiver mounted on a wall there must be no other
significant obstructions in the view of the sky.
l It must be mounted at least 1 m (3 ft), preferably 2 m (6 ft),away from other GPS receiving
equipment.
l It must not be sited in thefieldof radiationof co-located radio communications equipment and
should bepositioned ata distance of at least3 m (10 ft) away.
Mount the UGPS receiver on the wall of the equipment building if there is a suitable location on the wall
that can meet these requirements.
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