5 Settings
This chapter describes the master clock’s settings. See chapter
on page
for the syntax of the configuration file and instructions on how to access it.
5.1 General Settings
The parameters in this section allow the definition of identifier, location and
contact strings for the unit. These strings are shown on the web-based dash-
board and reported as
sysName
,
sysLocation
and
sysContact
over SNMP.
They are also included in all log files.
General parameters are defined in section [GENERAL].
[GENERAL]
User-defined identifier for the equipment, up to 30 characters long. Default is
IDENTIFIER
tima-<serialnr>
.
User-defined string for the equipment location, up to 30 characters long.
LOCATION
User-defined contact string (Email or telephone) for the equipment, up to 30
CONTACT
characters long.
5.2 GPS Receiver
The parameter ANT_DELAY can be used to compensate the propagation delay
in the antenna cable.
Additionally, it is possible to force the equipment to operate in a “fake” mode,
where reception of GPS signal and atenna connection are simulated. This can
be usefull during comissioning work, where the equipment is required to op-
erate before antenna installation has been completed.
GPS related parameters are defined in section [GPS].
[GPS]
Value (in nanoseconds) that corresponds to the delay introduced by the an-
ANT_DELAY
tenna cable, typically 4 ns/m (1.2 ns/ft).
The exact delay can be computed by:
t
=
1
c
×
K
v
×
l
where
c
= 3
×
10
8
m/s is the light speed,
K
v
is the velocity factor of the cable
being used and
l
is the cable length in meters.
K
v
is 0.82 for the Aircell 5
cable and 0.85 for the Ecoflex 10 plus cable. For other cables, refer to the
corresponding datasheet.
Default value is 60 ns, which corresponds to a 15 m (50 ft) antenna cable.
If TRUE, antenna connection and reception of GPS signals is simulated by the
FAKEGPS
unit.
The time reported by the unit will not be correct if FAKEGPS is enabled. Make
ATTENTION
→
sure to set FAKEGPS to FALSE (alternatively, delete or comment-out the line
from the configuration file) before normal operation.
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