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3.644 bytes |
Service Hints & Tips |
Document ID: YAST-3JJQTC |
ISDN External Modem - Fails to connect at high speeds
Applicable to: World-Wide
Symptom:
IBM PC300/700 Series 65x7, 68x7, 6589, and 6899 IntelliStation Z-Pro, PCServer 310 (8639-oEx) and PCServer 315 (8638-PSx/PJx,KJx,KSx) systems with ISDN external modems connected via the serial ports may fail to connect at speeds of 128kbps and higher.
Problem Isolation Aids:
The condition is most noticeable when attempting to transmit via two channels (B1 and B2) to achieve a transmission rate of 128kbps. The COM port speed will be set to 115.2kbps through the communication software (e.g. Dial-Up Networking for Windows95).
Solution:
This is not a defect. DO NOT replace system hardware.
The systems mentioned above meet all design specifications and operating performance requirements. This condition is a design characteristic of the serial transceiver chip used in the above PC 300 & 700 and PCServer 310/315 Series systems.
If you require high speed ISDN communications (e.g. 128kbps), either of the following recommendations should be considered:
1. Use an internal ISDN modem.
2. Acquire a serial adapter card designed to accommodate high ISDN transmission speeds.
Note: Each recommendation has been tested and is supported for high speed ISDN communication rates in the PC 300/700 and PCServer 310/315 Series systems.
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Search Keywords |
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Hint Category |
Performance | |
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Date Created |
30-06-97 | |
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Last Updated |
01-12-98 | |
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Revision Date |
19-11-99 | |
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Brand |
IBM Options | |
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Product Family |
Modems | |
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Machine Type |
128K | |
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Model |
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TypeModel |
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Retain Tip (if applicable) |
H16219 | |
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