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| 型號： | E110 |
| 英文描述： | Test Methods for 10Base-T Modules |
| 中文描述： | 試驗方法10Base - T的模塊 |
| 文件頁數(shù)： | 1/4頁 |
| 文件大小： | 56K |
| 代理商： | E110 |
TEST METHODS FOR PULSE
10BASE-T MODULES
Application Note
12220 WORLD TRADE DRIVE, SAN DIEGO, CALIFORNIA 92128 TEL 619-674-8100 FAX 619-674-8262 http://www.pulseeng.com
E110.A (5/97)
Scope
This application note depicts PULSE’s test methodology for 10Base-T. Test methods are in com-
pliance with the IEEE Std 802.3i-1993, which addresses both the 10Base-T chip as well as the
10Base-T module specifications. Module is defined as a single package component that includes
various combinations of resistors, transformers, filters and common mode chokes. The combina-
tion of a Pulse 10Base-T module with a compliant 10Base-T chip will meet or exceed the IEEE
Std 802.3i as well as enhance the ability to comply with FCC/VDE emissions. This application
note will describe the test methods listed in the bulleted items below.
s
Hi Pot
s
Insertion Loss
s
Return Loss
s
Cross Talk
s
Common Mode Rejection
Hi Pot
Short all transformer pins on the primary or chip side together. An example would be pins 1
through 7 of the module shown in Figure 1. Also short the secondary or media side pins together,
i.e. pins 8, 9, 13, and 14 in Figure 1. Apply 1500 volts RMS at 60 Hz for 60 seconds across pins 1
and 14. No voltage breakdown should occur.
Insertion Loss
Figure 1, on the next page, is a typical Insertion Loss Test Circuit. Pulse test fixtures include either
a North Hills Transformer or a Pulse PE-65490 Transformer (North Hills Transformer equivalent).
The purpose of these transformers is to convert a 50
coax line to 100 . The network analyzer
sweeps the requested frequency range and displays the measured frequency response.
To perform the Insertion Loss test:
1. Calibrate the network analyzer in the S21 mode by shorting pins 1 and 14 together and
shorting pins 3 and 13 together. Do a thru calibration.
2. Place module in test fixture and measure the insertion loss from 1 MHz to 100 MHz.
As seen in Figure 1 on the next page, some 10Base-T modules contain pre-equalization resistors.
Actual measured insertion loss readings will vary with those resistor values. All of Pulse’s low
pass filters, designed for 10Base-T applications, meet or exceed IEEE Std 802.3i. However, the
pre-equalization resistors mask filter performance test results.
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