Cabletron Systems MICROMMAC-22T, 42T manual COM Port Specifications, COM 1/COM 2 Ports

REQUIREMENTS/SPECIFICATIONS

Other Considerations

In addition to complying with the preceding cable specifications, the following recommendations should be followed to minimize errors and obtain optimum performance from the network:

•UTP cabling should be free of splices, stubs, or bridged taps.

•Maintain a two punch-down block limit between TCU ports and wall outlets.

•Properly ground metal troughs, ducts, etc. carrying Token Ring signals.

•Avoid routing Token Ring signals near copper cables that exit a building or are susceptible to lightning strikes and power surges.

•UTP cables containing Token Ring signals should not be simultaneously used for applications which may impress high voltages (greater that 5 volts) with sharp rise or fall times. The noise coupling from such signals could directly cause errors on the Token Ring network.

•Lobe lengths between TCU ports and connected devices should not exceed 100 meters of 22 to 24 AWG wire.

•Wherever possible, use dedicated UTP cable for Token Ring signals.

2.3 COM PORT SPECIFICATIONS

The RJ45 COM 1 and COM 2 ports (Figure 2-2) support Local Management applications. A description of COM port applications is listed below:

MicroMMAC-24TTOKEN RING HUB WITH LANVIEW®

SUPPORTING 100 OHM UTP CABLE

4M	16M
	DISPLAY RESET
	SPEED

COM 2 COM 1

Figure 2-2. COM 1/COM 2 Ports

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