GR-1089 does allow a get-out for intra-building surges for STP if grounded at
both ends of the STP cable. Some customers still insist that intra-building
Surges are applied to the conductors regardless of the cable type, STP or UTP.
[We 'design in' Intra-building surge protection (as a mimimum)
Ethernet usually does not connect to telecommunications outside plant/serve
'off premises' equipment. Hence 'Intra-building' surge can be applied to the
ENET lines. AC power cross does not apply for Intra-building cable connections.
[Also, If you use shielded cable and ground at both ends -
Russell,
The margin issue is usually a much discussed subject when it comes to
initial product EMC emission certification. As most experienced EMC
engineers know that variances in production units will occur. Also to ensure
that if a production unit is tested in a different 'accredited lab' a
In my experience in the US (FCC regs.)
Class B is for residential use and Class A is commercial business use.
Class B products are products marketed to the general public [for use in the
home] and Class A products are products marketed to Business [for use in the
office].
The FCC regs. do not
Does anyone know what the requirements for Ethernet (10bT/100bT) certification
and approval are for Japan?
When does an Ethernet interface require JATE approval? Is the approval only
reqd. when connected to a Leased Line? or does it apply when connected to a
local building ethernet network?
In my experience, I have always used the highest clock generated within the
device!! i.e. if a 66MHz (external) clock is taken in to a processor and a PLL
then multiplies up by 8 the highest fundamental is 528MHz. The PLL circuitry is
generating a free running clock [with fast rise/fall edges]
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