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Installation
TB9400 Installation and Operation Manual
© Tait International Limited
November 2019
4.6.8
Ethernet Connection
The RJ-45 socket on the reciter’s rear panel provides the 10-BASE-T or
100-BASE-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 firmware 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
to overflow internal buffers and therefore suffer packet loss. If you set the
port speed to 100 Mbit/s and observe QoS lost packet alarms, then review
your Ethernet port speed settings.
With the port speed at 10 Mbit/s it is particularly important to set the voice
QoS on the reciter port of your site router or switch to a strict priority queue
policy - which is the same policy that you should also be setting for your
site link ports. The default QoS settings restrict the voice bandwidth to 1/
25th of the port speed which is smaller than the required bandwidth for
typical systems at 10 Mbit/s.
If necessary, refer to
“Ethernet Connector” on page 129
Ethernet connection pin allocations.
