86 Installation TB9400/TN9275 Installation and Operation
© Tait International Limited May 2023
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 WebUI 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 for processing multiple voice streams along with supervisory
control and management communications. 10 Mbit/s is ample for these
requirements. The 10/100 Mbit/s setting is provided for compatibility
reasons, but with a 100 Mbit/s rate and high traffic conditions at the reciter,
small windows of internal buffer overflow may occur. These overflows
cause 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 133 for a list of
Ethernet connection pin allocations.
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