Electrical Noise/Radio-Frequency Interference; Requirements For Supporting Cti Applications - Lucent Technologies MERLIN LEGEND Release 5.0 System Planning Manual

MERLIN LEGEND Communications System Release 5.0
System Planning 555-650-112
1 Before You Begin

Requirements for Supporting CTI Applications

Electrical Noise/Radio-Frequency Interference

In most cases, electrical noise is introduced to the system through lines/trunks or
telephone cables. However, electromagnetic fields near the control unit may also
induce noise in the system. Therefore, the control unit and cable runs should not
be placed in areas where a high electromagnetic field strength exists. Radio
transmitters (AM and FM), television stations, induction heaters, motors (with
commutators) of 0.25 horsepower (200 watts) or greater, and similar equipment
are leading causes of interference. Small tools with universal motors do not
generally cause a problem when operated on separate power lines. Motors
without commutators generally do not cause interference.
Field strengths below 1.0 volt per meter are unlikely to cause interference.
Estimate the field strength produced by radio transmitters by dividing the square
root of the emitted power (in kilowatts) by the distance from the antenna in
kilometers.
This yields the approximate field strength in volts per meter and is relatively
accurate for distances greater than about half a wavelength (492 feet, or 150 m,
for a frequency of 1000 Hz).
To comply with FCC Part 15 requirements, each power supply on a newly
installed system must have a ferrite core installed around the AC power cord and
ground wire. Beginning with Release 2.1 this ferrite core is packaged with the
power supply module at the factory. Ferrite cores are also compatible with earlier
releases.
Requirements for Supporting CTI
Applications
If your site will take advantage of the Computer Telephony Integration (CTI)
capabilities of the MERLIN LEGEND Communications System Release 5.0, Each
Client Desktop must have one extension associated with a computer networked to
a Telephony server which in turn is connected to the MERLIN LEGEND R5
Communications System through a CTI Link.
configuration for support of CTI applications.
1. The Sales and Design Support Center (NTM) provides CTI pre-sale
support.
The A.E. should contact the NTM 1-888-297-4700–prompt #1 Key
and Intermediate Systems, then Prompt #2–MERLIN LEGEND split
– to discuss customer requirements and potential solutions. If the
CTI solution is deemed appropriate, then A.E. must obtain the
Professional Services Preliminary Survey.
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Figure 1-1 shows the system
Issue 1
June 1997
Page 1-5