2 network port specifications, Network port specifications -4, Noise – Cabletron Systems SEHI-22FL User Manual

Page 19: Temperature, Figure 3-1 sehi-22fl network ports

Chapter 3: Installation Requirements and Specifications

3-4

SEHI User’s Guide

Crosstalk

Crosstalk is caused by signal coupling between the different cable pairs
contained within a multi-pair cable bundle. 10BASE-T transceivers are
designed so that the user does not need to be concerned about cable
crosstalk, provided the cable meets all other requirements.

Noise

Noise is caused by either crosstalk or externally induced impulses.
Impulse noise may cause data errors if the impulses occur at very specific
times during data transmission. Generally, the user need not be concerned
about noise. If noise-related data errors are suspected, it may be necessary
to either reroute the cable or eliminate the source of the impulse noise.

Temperature

Multi-pair PVC 24 AWG cables typically have an attenuation of
8 dB to 10 dB/100 meters at 20

C (68

F). The attenuation of PVC

insulated cable varies significantly with temperature. At temperatures
greater than 40

C (104

F), Cabletron Systems recommends the use of

plenum-rated cables to ensure that cable attenuation remains within
specification.

3.2

NETWORK PORT SPECIFICATIONS

The SEHI-22FL provides ST-type ports for 10BASE-FL Multimode Fiber
Optic cabling. Figure 3-1 shows the network ports.

Figure 3-1

SEHI-22FL Network Ports

09162_04

SEHI Book Page 4 Friday, April 19, 1996 10:46 AM