Cabletron Systems MR-2000C User Manual - page 9
SECTION 2
PREPARATION FOR OPERATION
2.1 INTRODUCTION.
The MR-2000C Multiport Repeater is designed for quick and easy installation.
No special skills or tools are required to install the repeater on an Ethernet network.
2.2 NETWORK DESIGN GUIDELINES.
The following network design guidelines must be followed
for connecting a MR-2000C Multiport Repeater to the network. If not, unsatisfactory network perfor-
mance may result.
• 50 ohm Ethernet type coaxial cable must be used when making up thick-net cable segments.
• 50 ohm RG-58A/U type coaxial cable must be used when making up thin-net cable segments.
• Each thick-net cable segment that the MR-2000C will be connected to must be no longer than 500
meters (1640 feet) in length.
When making up networks requiring shorter cable runs, Ethernet standard length 23.4 m, 70.2 m, and
117 meter cable sections should be used. These cable sections may be connected together to form a
cable segment by using a barrel connector.
Use of non-standard cable lengths may result in impedance mismatches causing reflections to occur.
These reflections may cause data errors.
• Each thin-net cable segment that will be connected to the BNC port on the MR-2000C must be no longer
than 185 meters (606 feet) in total length.
• Each end of the thick or thin-net cable segment must be connected to a 50 ohm terminator.
• A maximum of 100 transceivers may be attached to a thick-net cable segment, and these transceivers
must be at least 2.5 meters apart throughout the length of the cable.
Transceivers should be placed on the black bands that run along the cable and are marked at 2.5 meter
intervals.
• A maximum of 30 connections may be made to a thin-net cable segment, and these connections must
be at least 0.5 meters apart.
• For safety, only one end of any thick or thin-net segment should be connected to earth ground. Con-
nection to earth ground at more than one point on the segment may allow for the occurrence of danger-
ous ground currents.
The BNC port of the MR-2000C is not connected to earth ground.
• On a thin-net cable segment, the male end of a BNC tee connector is used to directly connect hosts or
the transceiver to the thin-net segment. The female ends of the connector must be connected to another
cable segment or terminator.