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參數(shù)資料
| 型號(hào)： | IBM42M10SCYAA10 |
| 廠商： | IBM Microeletronics |
| 英文描述： | 1063 MB/S Gigabit Link Module(1063 MB/S 吉位連接模塊（高性能集成光纖收發(fā)器）) |
| 中文描述： | 1063 MB / s的千兆連接模塊（1063 MB /秒吉位連接模塊（高性能集成光纖收發(fā)器）） |
| 文件頁數(shù)： | 16/31頁 |
| 文件大?。?/td> | 511K |
| 代理商： | IBM42M10SCYAA10 |
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IBM42M10SCYAA10
IBM42M10LCYAA20
1063Mb/s Gigabit Link Module
Page 16 of 30
glm1063.02.fm.02
Feb. 15, 2000
Isolating Hardware Faults
The following sequence can be helpful in isolating most hardware faults:
1. Check the Link Unusable line. If it is low, then the link is active and this process won
’
t help.
2. Check the Fault line. If it is high, then the laser or the laser control circuitry is faulty: replace the GLM.
Note:
See Fault (Fault) on page 11 concerning when the GLM resets the Fault line.
Note:
The Fault line is known to come on due to probing.
3. Run a set of patterns through the card while in wrap mode (see Enable Wrap (EWrap) on page 14). If
these fail, run through the checks in "Troubleshooting: What If ..." below.
4. Disconnect the cable and insert an optical wrap plug, or a simplex 50-micron optical cable, that works
properly. Rerun the same tests you did in line 3 (not in wrap mode). If these fail, the optics are defective:
replace the GLM.
5. Rerun steps 1 to 4 on the companion GLM. If all tests pass, replace the cable.
Note:
If the tests in line 3 pass, this also verifies that the system and all connections to the GLM are
operating correctly.
Note:
This sequence assumes the use of the Link Acquision sequence listed on page 11.
Troubleshooting: What If ...
The laser never comes on (the Link Unusable line remains high):
Verify 5 volts on the GLM.
Verify Enable Wrap is low (should not be in electrical wrap mode).
With a scope, verify the Transmit Byte Clock line to ensure that the card is receiving a clean square wave
at 53.125MHz.
The module does not achieve bit synchronization:
Verify that the transmit and receive frequencies are within 0.01% of each other.
Verify that valid 8B/10B data is being sent on the transmit side. If the transmit side transmits a
01010101010101010101 pattern, the GLM will synchronize the clock to the data stream in the least time.
The module never gets into byte synchronization:
Verify that the Enable Comma Detect line is high so that a Comma Character will reset the shift register.
Verify that the transmitting GLM is getting a correct Comma Character on its Tx[00:09] or Tx[10:19] lines,
but not both.
Note:
A common mistake is switching the order of the lines.
The Fault line comes on:
The laser or its control circuitry is broken. Repeat the power-on sequence to verify the problem.
Note:
The Fault line is known to come on due to probing.
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