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參數(shù)資料
| 型號： | IBM42S10SNNAA20 |
| 廠商： | IBM Microeletronics |
| 英文描述： | 1063 MBd Gigabit Interface Converter(1063 MBd 吉位接口轉(zhuǎn)換器) |
| 中文描述： | 1063 MBd的千兆位接口轉(zhuǎn)換器（1063 MBd的吉位接口轉(zhuǎn)換器） |
| 文件頁數(shù)： | 9/35頁 |
| 文件大?。?/td> | 490K |
| 代理商： | IBM42S10SNNAA20 |
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IBM42S10LNYAA20
IBM42S12LNYAA20
IBM42S12SNYAA20
IBM42S10LNNAA20
1063/1250MBd Gigabit Interface Converter
IBM42S10SNNAA20
IBM42S10SNYAA20
GBIC.02
04/27/99
IBM Corporation. All rights reserved.
Use is further subject to the provisions at the end of this document.
Page 9 of 34
Operation
Link Acquisition Sequence
The following sequence should be followed to get an IBM GBIC in full synchronization with a companion card
undergoing a similar sequence. It will also work with a single card when using an optical wrap connector. This
sequence assumes the use of an industry standard 10b Ser/Des chip.
1. Power up the node. The clock to the 10b chip should be running.
2. Drive the Transmit Data lines to 0101010101. (This speeds up the synchronization process and assures
that the Comma Detect line on the 10b chip will not pulse randomly on the companion card during the
remainder of the sequence.)
3. Drive the input control lines as follows:
a. Enable Wrap (10b chip): low (will not be changed)
b. Enable Comma Detect (10b chip): high (will not be changed)
c. Lock to Reference (10b chip): high
4. After the laser has come on, bring Lock to Reference low for at least 500
μ
s.
5. Bring the -Lock to Reference high.
6. After 2500 bit times (2.4
μ
s), the link should be in bit synchronization (the internal clocks are aligned to the
incoming bit stream), but not yet byte synchronization (the byte is aligned along the same boundary it had
when sent from the companion system to the GBIC prior to serialization). The Receive Byte Clock (10b
chip) frequency should now be running at 0.1 times the bit rate and the Comma Detect line is ready to
indicate reception of the Comma Character.
7. Drive the Transmit Data lines with a K28.5 (Byte Sync) character.
As soon as the 10b chip receives the K28.5 character from the other side of the link, the clocks will align to
the byte boundary and all the Receive Data lines will have valid data. This will be indicated by the activation of
the Comma Detect line.
Troubleshooting: What If ...
The laser never comes on (the Tx_Fault signal is either high or low):
Verify 5 volts on the connector to the GBIC and that the module is correctly plugged.
If the Tx_Fault line is high, try either unplugging and replugging or powering down the module to reset the
Tx_Fault line (see
“
Resetting a Fault (Tx_Fault)
”
on page 8).
Try another GBIC. If the replacement operates correctly then retry the original. If the original still fails, it is
probably defective.
If the replacement fails also, verify that Tx_Disable is low and that it toggles correctly on the connector.
The Rx_LOS signal remains high:
Verify 5 volts on the connector to the GBIC and that the module is correctly plugged.
Verify the level on pin 1 of the connector. If the level is correct, there might be a discontinuity on the host
board.
Try using a wrap connector or a simplex jumper to loop the transmitter to the receiver. If the Rx_LOS line
goes low, the source of the optical signal or the link may be defective. Use an optical power meter to
check the optical power level. If the average optical power is within specification (> -17 dBm for shortwave
devices), then the GBIC might be faulty.
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