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1992-05-09
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HP Wire Test Instrument, Technical Data
Product Number 28687A
The HP 28687A Wire Test Instrument verifies and troubleshoots
twisted-pair cabling for Type 10BASE-T networks. It quickly performs
the necessary tests to evaluate the key parameters specified by
IEEE 802.3 to 10BASE-T standard: crosstalk attenuation, signal
attenuation over frequency, burst noise, and continuity.
The HP 28687A Wire Test Instrument is a result of HP's commitment
and leadership role in the Type 10BASE-T arena, as well as HP's
experience in the development of high-quality test instruments. "This
full-function portable instrument gives you a better way to verify and
troubleshoot twisted-pair LAN cabling."
Features
o Tests key parameters for Type 10BASE-T networks: crosstalk
attenuation, signal attenuation over frequency, burst noise, and
continuity. (Crosstalk attenuation and signal attenuation are
measured using 5-MHz sine wave, 10-MHz sine wave and 10-Mbit/s pseudo
random Manchester-encoded data.)
o Evaluates both bundled 25-pair and individual 4-pair twisted-pair
cabling.
o To ensure reliability, the HP 28687A performs self-test and
calibration during power on and recalibrates periodically during use.
o Weighing less than 10 pounds, this portable unit can be easily
carried to where you need it.
o The Monitor function lets you take up to a 24-hour look at the
cabling for identification of intermittent cabling problems. Data can
be printed out as it is collected, or printed and reviewed at the end
of the test period.
o The 16-character alphanumeric display steps you through the test
procedures and provides you with diagnostic information on each test
performed for each twisted pair.
o Prints out a hard copy of your test results by connecting to any
printer which supports the standard RS-232 interface.
o Easy-to-read LEDs indicate which pairs you have selected for testing,
which tests you have selected, and which pairs passed or failed.
o For quick wiring connections, the HP 28687A has a built-in 50-pin
Telco connector and comes bundled with a 12-port modular adapter for
8-pin jack connections.
Functional Description
Complete Testing of Type 10BASE-T Cable
Twisted-pair cable, unlike coaxial cable, allows for variations in
physical characteristics and has dynamic performance requirements such
as crosstalk, signal attenuation, and installation-dependent
specifications. Tools developed for the telephone industry are not
specialized to test for these specification requirements. The HP 28687A
Wire Test Instrument can quickly identify problems in these areas.
Designed specifically to verify compliance to the IEEE 802.3 10BASE-T
standard, the HP 28687A Wire Test Instrument lets you easily verify and
troubleshoot twisted-pair LAN cabling.
Easy to Use
This lightweight portable unit saves time by simplifying the complex
task of testing twisted-pair cabling. Individual tests or combinations
of tests can be run 3/4 5 LEDs indicate which tests you have selected.
Up to 24 pairs (12 ports) can be tested simultaneously 3/4 LEDs
indicate which pairs you have selected. The alphanumeric display steps
you through the test procedures and gives you complete diagnostic
information when you want it. An RS-232 printer port also allows you to
print a hard copy of the results. Twelve green LEDs indicate whether
the pairs have passed or failed the tests. Intermittent cabling
problems can be identified by pushing the MONITOR button, which
performs the selected tests for up to 24 hours.
Troubleshooting and Verification
Network downtime is expensive. While the costs of a downed network
cannot always be quantified, daily business depends on a functional
network. With the HP 28687A Wire Test Instrument, cable problems can be
easily and quickly identified.
To avoid intermittent problems and performance degradation problems,
both new and in-place twisted-pair cabling should be evaluated prior to
use as a LAN media. The HP 28687A Wire Test Instrument verifies the
suitability of in-place twisted-pair cable for your Type 10BASE-T
application before you install your network.
Functional Specifications
Physical Specifications
Dimensions:
Width: 27.9 cm (11.0 in)
Depth: 34.3 cm (13.5 in)
Height: 15.9 cm (6.3 in)
Weight: 4.1 kg (9.0 lb)
Environmental Specifications
Environment Temperature:
Operating: 0 degrees C to +55 degrees C (32 degrees F to 131
degrees F)
Nonoperating: -40 degrees C to 70 degrees C (-40 degrees F
to 158 degrees F)
Relative Humidity:
Operating: 5% to 95% at 40 degrees C (104 degrees F)
noncondensing
Nonoperating: 5% to 90% at 65 degrees C (149 degrees F)
noncondensing
Electrical Specifications
At Nominal Maximum Maximum Frequency
Voltage (ac) RMS Current RMS Power Range
100-120 volts 0.5 amp 30 watts 50-60 Hz
200-240 volts 0.3 amp 30 watts 50-60 Hz
Maximum Input Voltage:
Common Mode: 500 volts
Differential Mode: 24 Volts at f < 60 Hz, 1.5 Volts at f > 60 Hz
Measurement Specifications
Measurement
Range Accuracy Resolution
Signal Attenuation 0-15 dB +/-0.5 dB 0.1 dB
Crosstalk Attn 0-36 dB +/-1.0 dB 0.1 dB
Burst Noise 232 mV minimum +/-32 mV
Measurement made through a 3-pole Butterworth
low-pass filter with a 3-dB cut off at 15 MHz.
Source Characteristics:
Frequency Range 5-MHz sine wave, 10-MHz sine wave, 10-Mbit/s
pseudo random Manchester-encoded data
Output Level Range 1.25 volts peak +/- 250 mV
Impedance 100 ohms +/- 10 ohms
Output connector 50-pin Telco connector
Receiver Characteristics:
Frequency Range 5 MHz to 15 MHz
Input Level Range 20 mV peak to 1.5 volts peak
Impedance 100 ohms +/- 10 ohms
Input Connector 50-pin Telco connector
Altitude Operating: 0-4.6 km (15,000 ft)
Nonoperating: 0-15.3 km (50,000 ft)
Approvals
RFI (Radio Frequency Interference): FCC Class A, FTZ-1046/1984,
CISPR-22 Class A, VCCI Class 1
Safety: CSA C22.2-220 for ITE. Compliance with UL 478, UL 1244, and
IEC 348.
Ordering Information
The HP 28687A Wire Test Instrument includes an operating manual, 12
loopback hoods, one 12-port modular adapter, one test results pad and a
power cord.
Related Documents and Literature
5959-2208 HP SiteWire Twisted-pair Cabling Installation Guide
5090-2607 HP LAN Configuration Guide for IEEE 802.3 and Ethernet
Networks
5090-2642 HP EtherTwist Network Startup Guide
Warranty
The HP 28687A Wire Test Instrument is warranted for 1 year against
defects. Check with your local Hewlett-Packard Sales and Support Office
for more information.
Accuracy specified at 100-ohm line impedance.
Technical information in this document is subject to change without
notice.
From HP Networking Communications Specifications Guide,
5091-3821E, 9205, p 673
Associated files: none
HP Wire Test Instrument, Technical Data