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A properly and fully completed Verizon
NEBS Conformance CheckList is required from each Collocation
applicant for each equipment unit to be Collocated (physical
or virtual). Duplicate Check Lists are not required
for multiple installations (multiple units in one site,
or multiple sites); however, a new Check List is required
if any deployment configurations or characteristics
change. The Check List shall indicate the number of
CO sites affected. Upon receipt of a Check List for
equipment not previously analyzed in detail, Verizon
will require the Collocator to request its supplier
to provide the required supporting test data/results.
Once an equipment unit is analyzed and determined to
be acceptable, it will be removed from this list, and
a formal report will be prepared. Once determined to
be acceptable, no further Check Lists will be required,
unless the supplier introduces new hardware options,
or significantly redesigns the previously analyzed equipment.
Verizon Maintenance Engineering will be the sole judge
of new or significantly redesigned, installed,
equipment.
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To provide reliable, high quality
services and features, Verizon must deploy and use equipment
and systems that deliver dependable, reliable, and safe
performance during normally encountered operating conditions.
The NEBS requirements (Network Equipment-Buildings
System) are a set of generic equipment requirements
published by Telcordia Technologies that define the
minimum goals for equipment operating characteristics
(GR-63-CORE, currently Issue 1; GR-1089-CORE, currently
Issue 2). These requirements are intended to ensure
the safety and reliability of equipment and services
provided by Verizon. Conforming equipment should neither
affect nearby equipment, nor be affected by nearby equipment.
Additionally, GR-78-CORE (currently Issue 1) describes
various design and manufacturing techniques that will
help ensure system reliability --e.g., connector surface
type, shape, size; metallization type and thickness;
printed wiring board spacing, insertion force; avoidance
of 'mixed metals' for mating surfaces. The primary difference,
between the "NEBS requirements" and commercial
(UL, CSA) or international (FCC, IEC, EN, ETSI, CSPR)
requirements, is overall equipment reliability.
- NEBS addresses performance, operation, reliability, safety,
and specifies pass/fail criteria.
- UL and CSA address safety and limited safety related
operational factors.
- FCC addresses operational factors limited to interference
to other electronic equipment, and limits measurements
only to 1 GHz.
- EN, ETSI address performance, operation, and safety,
but use test limits that are lower than NEBS, and
do not adequately address reliability.
- IEC defines criteria in several performance levels,
but does not specify pass/fail levels.
The NEBS requirements specifically address equipment
intended for use in telecommunications applications;
they are intended to ensure safe, reliable equipment,
which is also immune to spurious interference from other
equipment. Current commercial requirements primarily
address safety. Various international requirements (e.g.,
ETSI, EN, IEC) address spurious radiation, with some
degree of immunity to interference. NEBS requirements
address a wider spectrum of conformance. It is required
that the equipment functions normally during the tests.
Other test requirements are either vague on this issue
or permit operational verification to be made after
the tests are completed.
NEBS requirements define flammability resistance, flame
spread, and speed of self extinguishing; operating temperature
and humidity limits; heat release; floor loading; vibration
(earthquake) resistance; power and grounding; electrostatic
discharge (ESD) immunity; and electromagnetic compatibility
(EMC) --radiated and conducted emissions and immunity.
These criteria reduce fire and safety risks, improve
equipment reliability, and allow pieces of equipment
to coexist in the CO building without interfering with
each other. The criteria also help ensure that equipment
will withstand the normal stresses expected to be experienced
during shipping, handling, storage, and installation.
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