Straight Through/Crossover Cable Requirements and Pin Specifications
2 kilometers - multimode
20 kilometers - singlemode
<100 meters
25 Mb/s or 155 Mb/s ATM Switch
crossover
Fileserver
<100 meters
Be certain that the twisted-pair cable is configured
correctly (straight through or crossover) for site. Cable connections between an ATM switch and the media converter must be configured as straight through. Cable connections between the media converter and a NIC must be configured as crossover.
| Straight Through Cable | ||||||
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Twisted |
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| 1 |
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| 1 | |
Pair #1 |
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| 2 |
| 2 | ||
Twisted |
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| 7 |
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| 7 | |
Pair #2 |
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| 8 |
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| 8 |
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Connectors for unlike devices
Twisted Pair #1
Twisted Pair #2
Crossover Cable
11
22
77
88
Connectors for like devices
The two active pairs in an ATM network are pins 1 & 2 and pins 7 & 8. Use only dedicated wire pairs (such as blue/white & white/blue, orange/white & white/orange) for the active pins.
Installation Notes
•KEEP TWISTED-PAIR RUNS AS SHORT AS POSSIBLE.
•Connect the power supply cable to the media converter BEFORE connecting to the outlet.
•Install unit with PSU provided. (Output 9 VDC regulated, 500 mA).
Troubleshooting the Media Converter
If the ATM media converter fails, determine the answers to the following questions:
1.Is the power LED on the media converter illuminated?
NO
•Is the power adapter the proper type of voltage and cycle frequency for your AC outlet? NOTE: Refer to the “Power Supply Requirements” on the back page.
•Is the power adapter properly installed in the media converter and in the outlet?
•Contact Technical Support at (800)
YES
•Proceed to step 2.
2.Is the TX Activity LED illuminated?
NO
•Check UTP cables for proper connection and pin assignment. (See above.)
•Contact Technical Support at (800)
YES
•Proceed to step 3.
3.Is the Fiber Activity LED illuminated?
NO
•Check fiber cables for proper connection.
•Verify that TX and RX cables on media converter are connected to RX and TX ports, respectively, on the other
•Refer to Tech Tips available at: http://www.transition.com
•Contact Technical Support at (800)
YES
•Contact Technical Support at (800)
ATM CABLE SPECIFICATIONS
The physical characteristics of the media cable must meet or exceed the specifications: ATM UNI 3.1
Maximum number of media converters in series: 2
COPPER CABLE SPECIFICATIONS
Category 5 wire or better is required. Either shielded
Category 5: |
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Gauge | 24 to 22 AWG |
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Attenuation | 20 dB/1000’ @ 10 MHz | |
Impedance | 100 Ω ±10% @ 10 MHz | |
Maximum Cable Distance: | 100 meters (330 feet) | |
FIBER CABLE SPECIFICATIONS |
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SINGLEMODE |
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Fiber Optic Cable Recommended: | 9 µm singlemode fiber | |
Fiber Optic Transmitter Power: | min: | max: |
Fiber Optic Receiver Sensitivity: | min: | max: |
Wavelength: | 1300nM |
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Bit error rate: | ≤ |
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Maximum Cable Distance: | 20 kilometers |
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MULTIMODE |
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Fiber Optic Cable Recommended: | 62.5 / 125 µm multimode fiber | |
Optional: | 100 / 140 µm multimode fiber | |
| 85 / 125 µm multimode fiber | |
| 50 / 125 µm multimode fiber | |
Fiber Optic Transmitter Power: | min: | max: |
Fiber Optic Receiver Sensitivity: | min: | max: |
Wavelength: | 1300nM |
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Bit error rate: | ≤ |
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