Cabletron Systems THN-MIM Installation Manual
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INSTALLATIONPage 2-2Since the ports on the module are internally terminated, the end ofthe segment that will be connected to the module will not be a teeconnector or terminator.2.2.2 Thin-net Segments (THN-MIM7593 only)The following network design guideline must be followed whenconnecting 75 or 93 ohm coaxial cable segments to the THN-MIM7593.If not, unsatisfactory network performance may result.• The length of the 75 or 93 ohm coaxial cable segment is dependenton signal loss from one end of the cable segment to the other. Signalloss must not exceed 4 db when measured with a 5 MHz sine waveor 6.5 db when measured with a 10 MHz sine wave.• A 75 or 93 ohm coaxial cable segment will only support point topoint communication, from one Ethernet device to theTHN-MIM7593. No other Ethernet devices are allowed on thesegment.• The far end of the 75 or 93 ohm coaxial cable segment must beterminated with a 50 ohm terminator. This will ensure that theEthernet device on the segment will receive the proper collisiondetection signal in the event of a collision.• The Ethernet device should be connected as close as possible to theterminator on the far end of the 75 or 93 ohm coaxial cablesegment. This will ensure that impedance mismatches due toreflection can be predicted.• The BNC ports of the THN-MIM7593 are connected to earthground. This eliminates the need for grounding the segmentconnected to the module.• Impedance mismatches may occur, resulting in signal degradation,due to the 75 or 93 ohm coaxial cable segment being connected to a50 ohm terminator. This may result in:a. Increased jitter on the segment, ranging from +/-3 to +/-6 ns,depending on the mismatchb. Under certain conditions false collisions may be created. |
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