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Home > GOLDBOOK 2004 > T&M SERVICE PROVIDER: VAS the Way? |
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GOLDBOOK 2004
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T&M SERVICE PROVIDER: VAS the Way?
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Continued from page: 1
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| Thursday, March 11, 2004 |
Buying Tips
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Compliance with ITU and International Recommendations:
For most T&M solutions, the specifications are laid out by the
international bodies like ITU-T, ETSI and ANSI for accuracy and consistency.
The buyer must ensure that the instrument complies with these standards.
Since the specifications for the instrument are much tighter than the
equipment or device to be tested, their compliance with the International
body’s recommendations is essential. If not, the results may lose accuracy
and repeatability in the measurement
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Portability and Ruggedness: The equipment should
be easy to carry and should have easy and accessible connections. It should
be rugged enough to support wide range of temperature, jerk and vibrations,
and humidity conditions.
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Technology Support: The instrument should be such
that it supports all the relevant technologiess for testing. It means that
if the instrument is designed for the transmission technology testing based
on optical fiber then it should support the currently prevailing technology
like SDH, POS and ATM on SDH together in one box. This allows the buyer for
easy testing in the technology mixed environment and also allows the testing
in the area of technology migration.
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Application Fitness: The instrument should not be
so much general purpose to overkill the investment of the buyer. The
instrument should target the correct market segment. For example, there are
certain tests that are a must in field installation and maintenance and
these are the key concern areas of the network operator. The instrument must
be able to do all the tests needed by this segment, but need not include the
entire lot of tests required in manufacturing and R&D. This will result
in value for money for the buyer. Operators do not use R&D and
manufacturing types of tests as they come in the area of factory acceptance
test (FAT).
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Scalability: The instrument should be such that it
is able to scale to higher bandwidth, interface, and testing requirement. It
should also be possible to upgrade the instrument without hardware and
software limitations so that the investment remains protected in the
evolving technology. For e.g., GPRS and 3G technologies are still in the
growth stage and have not yet matured. Modifications are happening in these
technologies and the instrument should be able to upgrade to the changing
technology and protocols.
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Pre-sales and After-sales support: The company
should have a direct presence in India so that they can advise and optimize
the testing and test times. There should be a strong technical support team
in the T&M supplier company so that instant solutions can be found while
troubleshooting.
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Repair and Uptime Support: The T&M supplier
should have a standard calibration, repair and support center so that
support of the order of 24/7 can be obtained.
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Solution Level from the Company: The T&M
company should have the core competence in the area of test and measurement
and should not be a non-focus segment in the company. Also the company
should be able to provide the test and measurement solution in all the
segments right form R&D to operations. Such companies are able to offer
the perfect fit for the T&M solution to the market.
| Communication
Technologies, Transmission Frequencies, and Sample Rates in LocaArea
Network |
| Use
the following chart to analyze communication technologies and
technical characteristics use in LANs as art aid in selected
appropriate test instruments. |
Communication
Technologies |
Date
Rate |
Communication
Medium |
No.
of Fibers/ Wire Pairs |
Encoding |
Transmission
Frequency |
Digital
Oscilloscope Sampling Rate |
| FDDI |
100
Mbps |
Fiber
optic |
2 |
4B5B |
125
MHz |
250
Msamples/s |
| CDDI |
100
Mbps |
Twisted
pair |
4 |
MLT-3 |
31.25
MHz |
62.5
Msamples/s |
| 10base-T |
10
Mbps/s |
Twisted
pair |
2 |
Manchester |
20
MHz |
48
Msample/s |
| 10Obase-T |
100
Mb/s |
Twisted
Pair |
4 |
8B/6T |
25
Mhz |
50
Msample/s |
| Gigabit |
1000
Mb/s copper |
Twisted
pair |
4 |
PA
M5 |
125
MHz/per pair |
250
Msample/s |
| Gigabit |
1000
Mb/s copper |
LX |
2 |
8B
/10B |
1.25
GHz |
2.5
Gsample/s |
| ATM |
155
Mb/s |
Twisted
pair |
2 |
CAP-64 |
25
MHz |
50
Msamples/s |
| ATM |
155
Mb/s fiber |
Multimode |
2 |
8
B10B |
194.4
MHz |
388
Msample/s |
| ATM |
155
Mb/s fiber |
Plastic
fiber |
2 |
NRZ |
155.520
MHz |
311
Msample/ |
| ATM |
155
Mb/s Fiber |
Single
mode |
2 |
Scrambled
1+X6+X7 |
155.520
MHz |
311
Msample/s |
| ATM |
622
Mb/s Fiber |
Single
mode |
2 |
Scrambled
1+X6+X7 |
622.080
MHz |
1.24
Gsample/s |
| ATM |
2.4
Gb/s fiber |
Single
mode |
2 |
Scrambled
1+X6+X7 |
2.48832
) GHz |
4.9
Gsample/s |
| ATM |
9.9
Gb/s Fiber |
Single
mode |
2 |
Scrambled
1+X6_X7 |
9.953280
GHz |
19.9
Gsample/s |
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