NETWORK REQUIREMENTS/SPECIFICATIONS
2-2
•
Length
- The thin-net segment must be no longer than 185 meters.
•
Terminations
- A 50 ohm terminator must be connected to the far ends
of each thin-net segment. The BNC port on the IRM is not internally
terminated.
•
Connections
- A maximum of 29 tee-connectors may be used
throughout the length of cable segment for host connections. If an
excessive number of barrel connectors are used within the cable
segment, such as finished wall plates with BNC feed-throughs, then a
reduced number of host connections may be required. For special
network design, contact Cabletron Systems’ Technical Support.
•
Grounding
- For safety, only one end of a thin-net segment should be
connected to earth ground. Connection to earth ground at more than
one point on the segment may allow for the occurrence of dangerous
ground currents.
The IRM's BNC port is not connected to earth ground.
2.2
OPERATING SPECIFICATIONS
The operating specifications for Cabletron Systems' IRM are included in
this section. Cabletron Systems reserves the right to change these
specifications at any time without notice.
REPEATER FUNCTIONALITY
Delay Times (Port x In To Port x out)
Start of Packet:
1450 ns max.
Collision to JAM:
1550 ns max.
Preamble
Input:
Minimum of 40 bits to a maximum of
64 bits required.
Output:
64 bits min (last 2 bits are 1,1).
