ADCP-75-110
•
Issue 2B
•
July 2001
Page 24
©
2001, ADC Telecommunications, Inc.
2.10 Maintenance Requirements
The
Digivance ICS requires no regular maintenance to insure continuous and satisfactory
operation.
Maintenance, as it applies to the Digivance ICS, primarily involves diagnosing and
correcting
service problems as they occur. Faults and failures arising from within the
Digivannce
ICS will generate an external alarm response which includes lighting an LED
indicator(s)
and closing or opening a set of alarm contacts. When an alarm is reported, it will
be
necessary to isolate the source of the problem by observing the LED indicators on each unit
and
then performing specified tests to isolate the problem. Once the source of the fault is
isolated,
the appropriate action can be taken to correct the problem. The only unit components
that
can be replaced are the cooling fans which mount in the DHU and the DEU. The failure of
any
other component within a unit will require replacement of the unit. Basic trouble-shooting
procedures
are provided in Section 5 of this manual.
2.11 System Design Recommendations
Follow
a systematic process when designing an in-building coverage solution. The following
sub
sections outline the four phases of the in-building coverage solution design process.
System
design and planning services are available from ADC if required. Refer to Section 6 of this
manual
for additional information.
2.11.1 Phase One – Initial Evaluation
Qualify
the Installation: Confirm that there are no extenuating circumstances that would
prevent
a successful installation such as: extreme cellular system issues (blocking, severe
interference,
site problems, etc.), building issues, power issues, or safety issues (site should
not
present any hazards or conditions that would make operation of the equipment unsafe).
Analyze
the RF Situation: Determine how the system RF link to the outside world will be
provided.
Will it be a direct feed from a BTS (microcell) or an over-the-air connection via a
donor
antenna? If it is a donor antenna, is the customer within the coverage footprint of a
serving
cell or better? The coverage can be determined during the preliminary walkthrough by
checking
the downlink Received Signal Strength Indication (RSSI) outside the building with a
unity
gain sampling antenna. Sometimes a rooftop reading is needed to obtain a sufficient
signal
level. Note that it is an FCC violation to expand the normal coverage footprint of a
cellular
site with an in-building product. In addition, consider the impact the system will have
on
traffic, especially the busy hour. Confirm with the service provider that the expected
increase
in the volume of calls will be addressed (if needed), possibly with additional
equipment
such as additional channels or a microcell.
Determine
the Amount of Building Attenuation: If a donor antenna will provide the RF link
to
the BTS, determine if there is enough signal isolation between the donor antenna and the in-
building
system to avoid a feedback loop and signal degradation. This step can often be
accomplished
during the preliminary walkthrough.
Discuss
Installation with Building Management and Engineering: Discuss all initially
anticipated
Digivance ICS coverage areas (including any obviously desirable cable routings,
equipment
installations, power and mechanical requirements) with the authorized client and
Summary of Contents for Digivance
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