EMM-E6 Ethernet User's Guide

NETWORK REQUIREMENTS
EMM-E6 User’s Guide 2-3
• Jitter - Intersymbol interference and reflections can cause jitter in
the bit cell timing, resulting in data errors. 10BASE-T links must not
generate more than 5.0 ns of jitter. Make sure your cable meets
10BASE-T link impedance requirements to rule out jitter as a
concern.
• Delay - The maximum propagation delay of a 10BASE-T link
segment must not exceed 1000 ns. This 1000 ns maximum delay
limits the maximum link segment length to no greater than 200
meters.
• Crosstalk - Signal coupling between different cable pairs within a
multi-pair cable bundle causes crosstalk. 10BASE-T transceiver
design alleviates concerns about crosstalk, providing the cable
meets all other requirements.
• Noise - Crosstalk, or externally induced impulses, are causes of
noise. Impulse noise may cause data errors if the impulses occur at
very specific times during data transmission. Generally, noise is not
a concern. If you suspect noise-related data errors, you may need to
reroute the cable or eliminate the source of the impulse noise.
• Temperature - Multi-pair PVC 24 AWG telephone cables typically
have an attenuation of approximately 8-10 dB/100 m at 20°C (78°F).
The attenuation of PVC insulated cable varies significantly with
temperature. At temperatures greater than 40°C (104°F), we
strongly recommend using plenum-rated cable to ensure attenuation
remains within specification.
CH1Book Page 3 Wednesday, March 20, 1996 7:48 AM