Agilent Technologies Switch/Measure Uživatelský manuál stáhnout pdf (Strana 6)

Choosing measurements

As mentioned, ETSI and ANSI specifications are devised for type approval

purposes. It is not practical to perform the complete set in every environment;

GSM equipment manufacturers and network operators must balance test

coverage with other factors such as cost and time. Nobody prescribes the

specific measurement set to be used at any one point in the GSM lifecycle

—

measurements must be chosen for each requirement. At each stage in the

development, manufacturing and maintenance cycles, measurements and

measuring equipment must be chosen according to need.

Test phases

At a high level the GSM lifecycle for base transceiver stations (BTS) is

summarized in the following diagrams:

Lifecycle Phase Purpose of Test

R&D Create and optimize design

Stress-test design/find corner cases

Verification Prove compliance before submitting to type approval

Find faults

Type approval Prove absolute compliance

Module test Calibration (manual and electronic)

Prove correct assembly and performance

Final test Prove correct assembly and performance

Configure and prove configuration

Confidence

QA test Quality control

Prove compliance/confidence

End-customer demonstration

Installation Prove correct field operation

Configure and prove configuration

Maintenance Monitor performance degradation and repair/swap out as required

Depot repair Repair/recalibrate modules for field

Trade-offs and compromises

It is not necessary or practical to make the whole suite of measurements, with

the same integrity (accuracy, dynamic range and number of averages) at each

point in the lifecycle. Generally the following factors are subject to trade-offs:

Test cost

Test coverage

Test throughput

Test system flexibility

The test cost of each unit can be reduced by performing measurements only

on the devices that have a real possibility of failing or performing only the

measurements required for device characterization.

Base Transceiver Station Test Lifecycle

R&D

Verification

Type

approval

Module

test

Final test QA test Installation

Lab Factory

Maintenance

Depot

repair

Field

Figure 2. BTS lifecycle

1. Exceptions: first, the ETSI and ANSI specifications do define the test suite for type approval. Also, in certain countries regulatory bodies do recommend

a test list for unit manufacturing final test and also for installation and maintenance test.

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