Mentor XL
12.
OPTION: 360-15-12 GPS TIME REFERENCE
12.1
I
NTRODUCTION
The
Global Positioning System
(
GPS
), is currently the only fully-functional
Global Navigation
Satellite System
(
GNSS
). More than two dozen GPS satellites are in medium Earth orbit, transmitting
signals allowing GPS receivers to determine the receiver's location, speed and direction. GPS also
provides a precise time reference used in many applications including synchronisation of
telecommunications networks.
The 360-15-12 option module may be connected to either a conventional GPS antenna, utilising the
internal receiver (see 12.4), or alternatively to an external receiver / antenna (see 12.5). This choice
is largely driven by consideration of the distance between the antenna site and the Mentor XL.
Please see the following sections for information on recommended antennas.
12.2
D
ISCLAIMER
Trilogy is not connected in any way with any of the companies mentioned in this manual. The
information is given in good faith from information in the public domain at the time of going to
press. Many different antennas are available and specifications change over time. Some degree of
experimentation may be required if the location is shrouded by adjacent structures, buildings etc.
Excessive cable length will adversely affect performance.
Trilogy has no control over the local conditions in which the equipment is installed and the customer
is expected to have carried out a site survey to ensure that that sufficient signal can be provided for
the equipment to work in a satisfactory manner. Trilogy will not be held responsible for failures
caused by poor installation, maintenance or changes in local conditions in which the required signals
have been degraded such that time synchronisation is lost.
12.3
I
NSTALLATION
12.3.1
Hardware
This is a hardware option, module type 360-15-12. It must only be fitted in option slot 1: if fitted into
any other position, an error message will be displayed. After installation, the module is automatically
detected and new menus displayed. See section 12.9.
Page 60 of 84
Trilogy Communications