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3.060 bytes |
Service Hints & Tips |
Document ID: JBAR-3THJQD |
Crossbrand - ISDN external modems fail to connect at high speeds
Applicable to: World-Wide
SYMPTOM:
The following systems equipped with ISDN external modems connected via either serial port fail to connect at communication speeds of 128kbps or higher:
IBM PC300/700 Series 65x7, 68x7, 6589
IBM PC300XL Series 6588
IntelliStation Z Pro Series 6899
PC Server 310 Model 8639-0Ex
PC Server 315 Models 8638-PSx / PJx / KJx / KSx
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 Windows 95).
FIX:
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 PC Server 310/315 Series systems.
If the customer requires high speed ISDN communications (e.g 128kbps), either of the following recommendations should be considered. Each of the following has been tested and is supported for high speed ISDN communication rates in the PC 300/700 and PC Server 310/315 Series systems.
1. Use of an internal ISDN modem.
2. Use of a serial adapter card designed to accommodate high ISDN transmission speeds.
If additional assistance is required, contact the IBM PC Company HelpCenter at 1-800-772-2227.
Windows 95 is a trademark of Microsoft Corporation.
SAS KEYWORDS:
PSY2 PSY2COMM PSY2OPER PSY2ADPT
PSVP PSVPCOMM PSVPOPER PSVPADPT
6577 6587 6877 6887
UNCLASSIFIED D/T8638 D/T8639 6588
PC300 PC700
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Search Keywords |
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Hint Category |
Communications, Retain | |
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Date Created |
13-04-98 | |
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Last Updated |
15-04-98 | |
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Revision Date |
13-04-99 | |
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Brand |
IBM IntelliStation, IBM PC, IBM PC Server | |
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Product Family |
Z Pro, PC 300XL, PC 330, PC 350, PC 365, PC 730, PC 750, PC Server 310, PC Server 315 | |
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Machine Type |
6899, 6588, 6577, 6587, 6589, 6877, 6887, 8639, 8638 | |
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Model |
various | |
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TypeModel |
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Retain Tip (if applicable) |
H16219 | |
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Reverse Doclinks |