Technical data

Alvarion Hardware
The positive and negative supply leads may be left floating or either one
may be connected to Ground (encompassing the -48V
telecommunications standard). We do not recommend connecting the
positive or the negative supply leads to ground. A safety ground must
be connected to the external case using the terminal provided (see
Figure 1-2).
An externally accessible fuse is provided on the rear panel. Normally,
field replacement of the fuse is neither required nor recommended.
Replace only with same type and rating, 250V, 2A, Time Lag.
The integrity of the GPS Receiver cannot be guaranteed if operated
outside design specification limits. The rise and fall times of the
power supply should be less than 1 second.
Output Specification
The following sections describe the individual outputs with illustrations
of the pulse shapes.
For a description of the individual PIN connections, see the.Cable and
Power Connections section from page 2-17.
2.048MHz
Command Unit: rear panel
GPS TIME & FREQUENCY
RECEIVER
ANTENNA
1PPS
FUSE
2A
TIME OF DAY
CHANNEL
COMMAND
CHANNEL
POWER LED
-48V
2A
POWER
Figure 1-2: Output Connections
1PPS
This output (locked in phase with the 2.048MHz frequency output)
represents the 1 second pulse transmitted from the GPS satellites,
aligned to GPS time. All signals are square waves with TTL compatible
levels when driving a 50Ω load.
GPS Timing Receiver Installation and Operation Manual
1-5