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INTRODUCTION
1.2 GETTING HELP
If you need additional support related to the MR9, or if you have any
questions, comments, or suggestions related to this manual, contact
Cabletron Systems Technical Support. Before calling, please have
the following information ready:
•
The product type (MR9T or MR9T-C) and the product serial
number. The serial number is located on the front panel of
the repeater.
You can contact Cabletron Systems Technical Support by any of the
following methods:
By phone:
By Compuserve:
By Internet mail:
1.3 OVERVIEW
The MR9T and MR9T-C have eight internally crossed-over RJ-45
ports. The MR9T has a ninth RJ-45 port which is switch-selectable
for a cross-over or a straight-through pin configuration. (For an
explanation of cross-over and straight-through, see Chapter 3,
Installation.) The configuration switch gives you complete flexibility
to connect to other twisted pair Ethernet devices without using
specially configured cable segments. All RJ-45 ports incorporate a
polarity detection and correction feature which lets the repeater pass
data regardless of the polarity of a port's twisted pair receive link.
On the MR9T-C, Port 9 has a thin-net coaxial male BNC connector
instead of an RJ-45 connector. Instead of a configuration switch, the
MR9T-C has a termination switch that lets you activate an internal
50 ohm cable terminator for Port 9.
You can use any port to connect the MR9T directly to an Ethernet
network, though Port 9 is normally used for the network connection.
Typically, the MR9T connects to a network hub, such as Cabletron
Systems' MMAC series. The MR9T-C can connect to a network hub,
or directly to an Ethernet coax cable through a transceiver.
Page 1-2
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