349 lines
18 KiB
Plaintext
349 lines
18 KiB
Plaintext
RECOMMENDATIONS REPORT
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(Revised)
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for
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File Transfer Via PC Pursuit
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(Oct 17, 1988)
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Telenet Communication Corporation
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Field Operations HQ Tech Support
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Reston, Virginia
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CONTENTS
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PAGE
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----
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1.0 Introduction........................................... 1
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2.0 Recommendations........................................ 2
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3.0 File Transfer Procedures............................... 5
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4.0 Summary................................................ 6
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SECTION 1.: Introduction
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Because of many customer complaints concerning PC Pursuit's inability
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to allow file transfers, Field Operations was requested to provide
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recommendations for file transfer via PC Pursuit. In compliance with
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this request, this document provides the following:
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* Recommendation on the best file transfer protocols to be used
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with PC Pursuit.
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* Recommendation on the hunt-confirm sequence and line parameters
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which provide optimum performance of various protocols.
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* The average transfer rates which can be expected using the
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correct hunt-confirm sequence and optional parameter settings.
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SECTION 2.: Recommendations
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This section outlines the most common file transfer protocols used
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with PC Pursuit. The performance of the protocols in the direct con-
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nect and PC Pursuit environments are also indicated.
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The following protocols were tested via the Chicago in-dial to the
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Washington DC out-dial; the observations are summarized below.
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XMODEM XMODEM XMODEM
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PC Pursuit XMODEM file transfers performed at an average throughput of
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30% when the correct hunt-confirm and terminal type was utilized.
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XMODEM does not support flow control, therefore it is suggested that
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the "relaxed" mode be invoked if the user's communications software
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permits this feature.
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YMODEM YMODEM YMODEM
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The performance of YMODEM file transfers VIA PC Pursuit was found to
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have an average throughput of 56% when the correct hunt confirm and
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terminal type is employed. Although YMODEM does not support flow
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control, it uses large 1024 byte packets which the network PAD handles
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quite readily under normal conditions. As a result, YMODEM is rated
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one of the faster protocols for file transfer via PC Pursuit.
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WXMODEM WXMODEM WXMODEM
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WXMODEM file transfers utilizing the correct hunt-confirm and terminal
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type performed well with an average transfer rate of 52%. This
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protocol is capable of handling flow control which enables it to
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perform with better reliability in the PC Pursuit environment. Users
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should be aware that an early version of PROCOMM is known to have a
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software problem which can affect the performance of WXMODEM file
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transfers.
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KERMIT KERMIT KERMIT
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An optimum average throughput of 47% was obtained by KERMIT file
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transfers via PC Pursuit. The throughput was optimized by modifying
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the packet size to 90 and adjusting the (host) window size to 16 (for
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uploads). KERMIT software which supports the sliding window feature
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performs with optimum efficiency in the PC Pursuit environment.
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SEALINK SEALINK SEALINK
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SEALINK file transfers via PC Pursuit performed exceptionally well
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with an average throughput of 74% with the correct hunt-confirm and
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terminal type. SEALINK supports flow control and was specifically
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designed to operate in the networking environment.
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ZMODEM ZMODEM ZMODEM
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File transfers utilizing ZMODEM protocol via PC Pursuit yielded an
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average transfer rate of 61%. ZMODEM performs well in the PC Pursuit
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environment, however; the local configuration for ZMODEM file trans-
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fers proved to be cumbersome and difficult for the user. ZMODEM re-
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quires several parameters to be set locally and on the local pad.
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These parameter settings can vary depending on the type of machine and
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the type of communications software. The X.3 PAD parameters which
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should be employed are 1:0,4:10,5:1,7:8,12:1. In addition, flow con-
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trol (XON/XOFF) should be enabled at the user PC. Because of the
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difficulty in configuring ZMODEM for file transfer, it is recommended
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that only seasoned computer users attempt ZMODEM file transfers via PC
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Pursuit.
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The following page summarizes file transfer performance of the
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protocols tested. The protocols are listed in order (PCP best to
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worst) in two categories: 1) performance via direct connect, 2) per-
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formance via PC Pursuit utilizing the recommended hunt confirm and
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parameter settings shown. It should be noted that the optional
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parameters need only be employed if a user experiences problems with
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transferring a particular file.
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SECTION 3.: File Transfer Procedures
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This section outlines the step by step procedure for executing file
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transfers via PC Pursuit. These procedures must be followed exactly to
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achieve optimum transfer rates. The optional X.3 parameters shown on
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the previous page indicates the parameters which provide the best
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transfer rate.
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STEP 1.: Set PC communications software to 8 bits, no parity,
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1 stop bit, full duplex. Depending on the type of protocol
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to be used, disable or enable local (XON/XOFF) flow
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control.
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STEP 2.: Dial local rotary with the communications software
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set at the desired speed.
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STEP 3.: Upon answer use the correct hunt confirm sequence:
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At 300/1200bps use - <CR D CR>
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At 2400bps - <@ D CR>
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NOTE: "D" MUST BE UPPER CASE.
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STEP 4.: At prompt "TERMINAL = " enter <D1> and return.
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STEP 5.: At the "@" prompt enter the destination mnemonic,
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out-dial speed, ID and password. It is important
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that out-dial speed matches in-dial speed.
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DO NOT MIX IN-DIAL AND OUT-DIAL SPEEDS.
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STEP 6.: If pad X.3 parameters are to be changed, do so
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at this point by entering <@ CR>. Set parameters as
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prescribed. Return to out-dial port by entering
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<CONT>.
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An example of the proper syntax for modifying X.3 PAD
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parameters would be "SET 7:8,1:0." To display the current
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PAD parameter settings, the user should enter "PAR?."
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These are only two of many user commands available. Many
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of the user commands are clearly defined in the Telenet
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document "How to Use Telenet's Asynchronous Dial Service."
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STEP 7.: Upon connecting to the destination pad, insure
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communication with the out-dial modem by entering <ATZ>.
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The destination modem will respond with "OK".
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STEP 8.: Enter <ATD> and the local number you wish to dial.
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STEP 9.: Queue host file transfer and start file transfer.
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Please note that these are the basic steps needed to achieve success-
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ful file transfers. Since communications software may vary from
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package to package, additional steps may be needed to initiate the
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start of the file transfer at the user software level.
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SECTION 4.: Summary
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Extensive testing has resulted in identifying the expected performance
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of six file transfer protocols when used with PC Pursuit. These
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protocols have been determined to perform satisfactorily with PC
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Pursuit when the correct hunt-confirm, terminal type and parameters
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are employed.
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It is the recommendation of Field Operations that customers be in-
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formed of the correct logon procedures and the protocols which provide
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the most reliable file transfers. Customers should also be reminded
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that PCP users can expect a small degree of network delay which is
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considered a common characteristic of packet switched networks. In
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addition, users should also be informed that poor quality voice grade
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telephone lines can adversely affect file transfer sessions.
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Field Operations is one of many Telenet groups dedicated to providing
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customers with complete support for PC Pursuit. Field Operations will
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offer assistance with file transfer problems providing the customer is
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willing to release a copy of the problem software as well as provide
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the pertinent information necessary to resolve the problem.
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Because problems can vary in nature, the information required to
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resolve problems can differ from one problem to the next. But at the
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very least, the following information will be required:
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* Type of communication software
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* Type of PC, make, model
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* Type of modem
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* Call origin
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* Call destination
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* Speed in
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* Speed out
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* Type of session
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* Time of failure
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* Date of Failure
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* Point of failure in session
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* Out-dial number
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* Network Address (if possible)
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* Copy of PC Software (in some cases)
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Additional information may be required depending on the nature of
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the problem.
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FILE TRANSFER
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PERFORMANCE STATISTICS
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PERFORMANCE STATISTICS DIRECT CONNECT
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General Communication Parameters = 8 bits
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1 stop bit
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N no parity
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Terminal Type = D1
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| PERFORMANCE STATISTICS DIRECT CONNECT |
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| XFR |
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| PROTOCOL SPEED SECONDS CPS BPS RATE |
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|======================================================|
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| SEALINK UP 1200 ***517 87.15 871.49 73% |
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| SEALINK UP 2400 ***270 166.87 1668.74 70% |
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| SEALINK DN 1200 ***428 105.27 1052.71 88% |
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| SEALINK DN 2400 ***230 195.90 1958.96 82% |
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| ZMODEM UP 1200 ***408 110.43 1104.31 92% |
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| ZMODEM UP 2400 ***201 224.16 2241.59 93% |
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| ZMODEM DN 1200 ***391 115.23 1152.33 96% |
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| ZMODEM DN 2400 ***195 231.06 2310.56 96% |
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| YMODEM UP 1200 **259 102.80 1027.95 86% |
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| YMODEM UP 2400 **126 211.30 2113.02 88% |
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| YMODEM DN 1200 **244 109.11 1091.15 91% |
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| YMODEM DN 2400 **130 204.80 2048.00 85% |
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| WXMODEM UP 1200 **277 96.12 961.16 80% |
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| WXMODEM UP 2400 **159 167.45 1674.47 70% |
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| WXMODEM DN 1200 **405 65.74 657.38 55% |
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| WXMODEM DN 2400 **131 203.24 2032.37 85% |
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| KERMIT UP 1200 **356 74.79 747.87 62% |
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| KERMIT UP 2400 **211 126.18 1261.80 53% |
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| KERMIT DN 1200 **322 82.68 826.83 69% |
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| KERMIT DN 2400 **178 149.57 1495.73 62% |
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| XMODEM UP 1200 **259 102.80 1027.95 86% |
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| XMODEM UP 2400 **140 190.17 1901.71 79% |
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| XMODEM DN 1200 **268 99.34 993.43 83% |
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| XMODEM DN 2400 **146 182.36 1823.56 76% |
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======================================================
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**File size = 26624 ***File size = 45056
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FILE TRANSFER
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PERFORMANCE STATISTICS
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PERFORMANCE STATISTICS VIA PCP
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General Communication Parameters = 8 bits
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1 stop bit
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N no parity
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Terminal Type = D1
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| PERFORMANCE STATISTICS VIA PCP |
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| HUNT ITI |
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| XFR CONFIRM FLOW X.3 PAD |
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| PROTOCOL SPEED SECONDS CPS BPS RATE SEQUENCE CONTROL PARAMETERS NOTES |
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|================================================================================================ ===========================|
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| SEALINK UP 1200 ***561 80.31 803.14 67% CR D CR XON/XOFF *7:8,1:0 End-to-End flow control on |
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| SEALINK UP 2400 ***300 150.19 1501.87 63% @ D CR XON/XOFF *7:8,1:0 End-to-End flow control on |
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| SEALINK DN 1200 ***447 100.80 1007.96 84% CR D CR XON/XOFF *7:8,1:0 End-to-End flow control on |
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| SEALINK DN 2400 ***231 195.05 1950.48 81% @ D CR XON/XOFF *7:8,1:0 End-to-End flow control on |
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| ZMODEM UP 1200 ***622 72.44 724.37 60% CR D CR XON/XOFF *1:0,4:10,5:1,7:8,12:1 End-to-End flow control on |
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| ZMODEM UP 2400 ***363 124.12 1241.21 52% @ D CR XON/XOFF *1:0,4:10,5:1,7:8,12:1 End-to-End flow control on |
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| ZMODEM DN 1200 ***573 78.63 786.32 66% CR D CR XON/XOFF 1:0,4:10,5:1,7:8,12:1 End-to-End flow control on |
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| ZMODEM DN 2400 ***288 156.44 1564.44 65% @ D CR XON/XOFF 1:0,4:10,5:1,7:8,12:1 End-to-End flow control on |
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| YMODEM UP 1200 **443 60.10 600.99 50% CR D CR NONE *7:8,1:0 |
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| YMODEM UP 2400 **200 133.12 1331.20 55% @ D CR NONE *7:8,1:0 |
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| YMODEM DN 1200 **335 79.47 794.75 66% CR D CR NONE *7:8,1:0 |
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| YMODEM DN 2400 **211 126.18 1261.80 53% @ D CR NONE *7:8,1:0 |
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| WXMODEM UP 1200 **480 55.47 554.67 46% CR D CR XON/XOFF *7:8,1:0 End-to-End flow control on |
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| WXMODEM UP 2400 **258 103.19 1031.94 43% @ D CR XON/XOFF *7:8,1:0 End-to-End flow control on |
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| WXMODEM DN 1200 **363 73.34 733.44 61% CR D CR XON/XOFF *7:8,1:0 End-to-End flow control on |
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| WXMODEM DN 2400 **193 137.95 1379.48 57% @ D CR XON/XOFF *7:8,1:0 End-to-End flow control on |
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| KERMIT UP 1200 **597 44.60 445.96 37% CR D CR XON/XOFF *7:8,1:0,5:1,12:1 |
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| KERMIT UP 2400 **298 89.34 893.42 37% @ D CR XON/XOFF *7:8,1:0,5:1,12:1 |
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| KERMIT DN 1200 **389 68.44 684.42 57% CR D CR XON/XOFF *7:8,1:0,5:1,12:1 |
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| KERMIT DN 2400 **196 135.84 1358.37 57% @ D CR XON/XOFF *7:8,1:0,5:1,12:1 |
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| XMODEM UP 1200 **734 36.27 362.72 30% CR D CR NONE *7:8,1:0 |
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| XMODEM UP 2400 **424 62.79 627.92 26% @ D CR NONE *7:8,1:0 |
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| XMODEM DN 1200 **638 41.73 417.30 35% CR D CR NONE *7:8,1:0 |
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| XMODEM DN 2400 **373 71.38 713.78 30% @ D CR NONE *7:8,1:0 |
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=============================================================================================== ============================
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* Optional PAD parameters which optimize performance **File size = 26624 ***File size = 45 56
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Downloaded From P-80 Systems 304-744-2253
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