Cambium PTP 670 Series, Руководство пользователя

Страница: 326 / 594

Chapter 5: Installation Installing the Trimble Accutime GPS receiver
Page 5-29
Installing the Trimble Accutime GPS receiver
To install a GPS receiver as the timing reference source for PTP-SYNC, use the following
procedures:
•
Mounting the GPS receiver on page 5-29
•
Preparing the GPS drop cable on page 5-29
•
Assembling an RJ45 plug and housing for GPS on page 5-30
•
Assembling a 12 way circular connector on page 5-32
•
Connecting the GPS drop cable on page 5-36
•
Top grounding point for GPS adapter cable on page 5-36
•
Installing and connecting the GPS LPU on page 5-38
Caution
Prior to power-up of equipment, ensure that all cables are connected to the correct
interfaces of the PTP-SYNC unit and the GPS receiver module. Failure to do so may
result in damage to the equipment.
Mounting the GPS receiver
Mount the GPS receiver (following manufacturer’s instructions) upon either an external wall
(
Figure 43 ) or a metal tower or mast ( Figure 44 ).
Preparing the GPS drop cable
Use this procedure to make the main drop cable that will connect the GPS receiver to its
bottom LPU. GPS drop cables do not require top LPUs.
Caution
Always use Cat5e cable that is gel-filled and shielded with copper-plated steel.
Alternative types of cable are not supported by Cambium.
1 Measure the distance from the GPS receiver to the LPU site at building entry.
2 Cut the required length of drop cable.
3
Attach one or more hoisting grips to the top end of the cable, as described in Install the main drop
cable on page 5-16 .