Tait International Limited TBCH3B User Manual
TB9400 Installation and Operation Manual
Installation
77
© Tait Limited July 2017
4.6.7
Connecting a 1PPS Source
A 1PPS signal is required for simulcast and P25 Phase 2 base stations. Use
a 50
a 50
: coaxial cable (RG58 or RG223) to connect the source to the base
station’s 1PPS input. You can daisy-chain up to eight base stations using
F-junctions. We recommend that the cable length between the first and last
load is kept to a minimum. This will reduce any propagation variation
between base stations. The maximum overall cable length is 30m.
Terminate the last connection (including single base stations) with a 50
F-junctions. We recommend that the cable length between the first and last
load is kept to a minimum. This will reduce any propagation variation
between base stations. The maximum overall cable length is 30m.
Terminate the last connection (including single base stations) with a 50
:
resistor, otherwise reflections of the 1PPS pulse may occur.
Notice For P25 Phase 2 operation the NTP signal must be linked to
the 1PPS signal. To ensure synchronization, both signals must come
from a source that is GPS-disciplined.
the 1PPS signal. To ensure synchronization, both signals must come
from a source that is GPS-disciplined.
4.6.8
Ethernet Connection
The RJ-45 socket on the reciter’s rear panel provides the 1-BASE-T or
100BASE-T Ethernet connection to the other devices in the network. Use
a Cat-5 cable to connect this socket to the Tait Network via a router or
switch.
100BASE-T Ethernet connection to the other devices in the network. Use
a Cat-5 cable to connect this socket to the Tait Network via a router or
switch.
The Web UI allows you to set the Ethernet port speed auto-negotiation to
10/100 Mbit/s or to negotiate a maximum 10 Mbit/s. Tait recommends that
you keep the port speed at the factory default setting of 10 Mbit/s. The
reciter hardware and software are scaled to meet the performance
requirements of processing multiple voice streams along with supervisory
control and management communications. 10 Mbit/s is ample for those
requirements. The 10/100 Mbit/s setting is provided for compatibility
reasons, but it is possible under high traffic conditions at 100 Mbit/s for
traffic arriving at the reciter at the full rate within a small timing window
10/100 Mbit/s or to negotiate a maximum 10 Mbit/s. Tait recommends that
you keep the port speed at the factory default setting of 10 Mbit/s. The
reciter hardware and software are scaled to meet the performance
requirements of processing multiple voice streams along with supervisory
control and management communications. 10 Mbit/s is ample for those
requirements. The 10/100 Mbit/s setting is provided for compatibility
reasons, but it is possible under high traffic conditions at 100 Mbit/s for
traffic arriving at the reciter at the full rate within a small timing window
Figure 4.12 Daisy-chaining a 1PPS input
The longest length of cable must be between
the source and the first base station
use short lengths of cable
between each base station
maximum of eight base station
loads on one 1PPS output
50
: termination
(also needed for
single base stations)