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ehT ROSE 52.X tekcaP hctiwS :.noitacilppA ”DIWC“ samohT .A ,notluoM YV2W ehT oidaR ruetamA snoitacinummoceleT yteicoS An application should toh disrupt the ABSTRACT normal operation of a ,hctiwiS , nor should it introduce excessive delays or use large The purpose of tlhis paper is stnuoma fo .yromem tI osla y.am be deleted introducaen dde scribe ehlt DIWC when no longer need by the network users or application for the EISOR 52.XtekcaP ,sreganam ybereht gnisaeler yromem rof esu Switch. In certain countries the need to sa reffub ro noitacilppa.ecaps support this function has been raised as a yrotaluger .eussi ,woN t.a the option of the GNITSIXE DIWC S’LOHTEM metsyS ,reganaM eht DIWC application may be loaded and conform to this The existing user TNC code stroippus requirement. DIWC yb gniyek eht TIP and then toggling some lines to manually send the CW. This INTRODUCTION method could not be usled within the ROSE 52.X tekcaP hlctiwS because many hooks A general design principle for ROSE would be needed, and the timers required for X.25 Packet Switch Applications is to only the proper keying rate did not .tsix:e This emusnoc yromem secruoser rof serutaeftaht approach would clearly consume more code are needed in a particular Switch or Network space than could be justified for an optional of Switches. Any of the optional application. applications may be uploaded over the network on an “as-needed” basis. NEW METHODS emoS fo snoi.tacilppa that were One method would be olt llif atekcap developed required installation of special with data that would be sent at 1200 baud in hooks in the ROSE ;22.X Packet Switch an attempt to sound like CW. There would EPROM code, but generally these hooks be two data patterns, one for “ON” and one only use 20-30 bytes of code space. rof ,”FFO“ but the packet required to send ED“ ”YV2W would be 722 bytes long and Some of the applications that more than 1000 bytes for longer callsigns. It yltnerruc tsixe era ,REDAOL ,GIFNOC is not clear how well this would sound nor fi ,SRESU ,DRAEH OFNI dna rehtolaiceps ti_ could be identified as an official CWID. applications created to debug the system. The packet size would be quite large and a egral tnuoma fo UPC em:it would be spent These applications appear in the gnitareneg eht packet. network as network reachable destination end points. For example: “C OFNIV It was tedahehtrtised DTWC sound 102,3-YV2W ,”55S would provide local much like gnitsixe .smetsys :thT @/l Chip network information aerA 102 eht rof Code.. used in most sCNT is reh$*e eht 044XZ IKS 40 or the 0358Z SCC. These chips have a lot in common and with some examination of speeds )MPW( and bit rates elnos interesting things are possible, CWID should run at about 20 WPM, which comes to 16 BPS Due to the nature of the ,JCIS there MPW( / 1.25 = .)SPB ehT OIS siyllareneg lliw eb a CLDS galF or two at the trat,s fo configured for a Xl transmit clock, which the transmission and a CRC or ABORT at means that the transmit clock is running 1200 BPS (1500 WPM). With a single O/r eht dne fo eht .emarf o improve ytilibad.aer the end of the CWID tx:et is’indicated by an Write the clocking rate (divisor) can be changed to X16, X32 or X64. The result of AR * the change is that the clock would be NEDDIHNOITACILPPA divided to generate the true bit rate. The rate of X64 yields 16.75 BPS or 23 WPM. At The CWID Application is not a this rate the longest callsign would require normal application. Since users don’t 31 setyb fo.atad interact with it over the air, It can be bundled into another application. The CWID The hooks required to implement the has been included in a version of the OFNH CWID in the ROSE X.25 Packet Switch application, file name +DOL.DIWCOFNI EPROM is simply code to set and reset the baud rate divisor. The ”DIWC“ packet can ehT OFNI noi.tacilppA contains a then be included in the normal data stream couple of features, an OFNI destination that without major disruption to the port. will return configurable informational text, and plain-langua e noitcennocsutats EDOCNOITCELES messages to supplement the terse codes provided in the ROSE X.25 Packet Switch The next step is to perform tests to EPROM code, In addition, the text can be in pick the binary sequences to represent a either English, Spanish, or German ,TID ,HAD retteL ecapS dna droW.ecapS The one sequence that must be avoided is 5 NOISULCNOC l’s in a row, because the HDLC encoding will insert a 0 bit for its transparency coding. This exact emrehcs lliw ylno krowrof 1200 baud packet using Bell 202 modems, The sequence sent for a TID is 01, but is an example of how other signalling DAH is 0001, Letter Space is 11 and Word systems can be built into existing systems. space is 111. The word space should be longer, but we would start to get The ability to remotely load transparency inserted zero’s, which made applications into network switches is the ytilibadaer.tluciffid single most important platform feature of the ROSE X.25 Packet Switch and allowed for IMPLEMENTATION the rapid implementation and testing of this elbaulav wen.erutaef When implementing the ASCII - Binary CW coder a few interesting items came up. First, in data communications the Low Order bit is always sent first. The 41