Simplex Converters and FSK Modems

Converters Multiplex FSK Modem 1989 Simplex Time Recorder Co Gardner Mass 01441 000 S A publication provides service DC communications the DC communications RS232C converter and the FSK modem 617 213 This manual makes no attempt on modems describe what an FSK modem to those sources for further information There are many outside sources converters and the FSK modem allow us to make full use of all possible data transmission devices allow 2120 communications that no special telephone to be transmitted over voice grade required to support the application conditioning Together a wiring between buildings by making use of existing site telephone wiring we might use converters with building FSK modem eliminate 2120 DO THESE DEVICES FIT INTO THE 21207 converters convert 2120 DC communications converts RS232C signals to and from signals compatible with voice grade to RS232Ccompatible and vice versa The FSK converters and the FSK modem fit into the 2120 as shown below CRTs OR TAPE TO 63 COUNTS AS AT ONE that two modems are required one for each end of the telephone the 2120 communications associated with the modems must also operate at 1200 baud The modems operate at 1200 baud INTERCONNECTIONS 1 illustrates converter and modem connections on the BMUX side of the telephone and modem connections us to connect multiple use of a single expanded This eliminates could satisfy all needs on the far end of the telephone Figure 2 illustrates Note that there are two different DC communications The other possible connection RS232C need for the converter however we would use such a configuration only if a single Figure 2 One possible connection uses an RS232C on the far end of the telephone ETs can be set up so that they directly the other end of the telephone COMM TO RS232C MODEM NOTE q FROM TO Terminals the FSK modem are located on an point strlp on the modem mounting MODEM NOTE Terminals the FSK modem an point strip on the modem plate 1 TO DC COMM TO 1 1 ON ET CPU XMIT 9 RCV SHIELD 2 far as troubleshooting our equipment because the far side of the telephone converters and modems are concerned we only want to isolate the problem either which we can replace or to telephone company equipment You know when a trouble COMM FAILED PRI for all transponders BMUX will report primary communications INDICATORS are three LEDs on the modem panel that you should observe during troubleshooting The RCV LED which should be rapidly flashing The XMT LED which should also be rapidly flashing The DSR LED which should be on steadily when the modem is powered up PROCEDURE flowcharts on the following pages will help you isolate problems to the converters and FSK modem or to the Each flowchart has a figure number Any given flowchart contains all the information necessary perform any tests or checks called out on that flowchart Follow the flowcharts exactly and when you reach figure reference PROCEED DIRECTLY TO THE REFERENCED FIGURE Definitions symbol continuing used to request a certain act test of performance Perform action symbol will contain a simple question which provides Two points will be labeled one point correct answer to the question based on other Exit at the action the steps are continued on another symbol number will be written inside the symbol Flowchart of each flowchart A similar symbol with a reference number will appear on the figure indicated The flowchart numbers appear at the the previous available and it is always an action symbol Refer to the referenced material prioer to performing used when additional the steps are continued on another part of the same page a circle at the point where circle will match the number reference symbol action symbol number within continues symbol required The information within the symbol will recommend a source of aid a very serious malfunction exists and additional assistance u RCV XMT LEDS Oir MODEM FRONT FLASHING THE FOLLOWING AT FAR END COMM CHANNEL OPEN BAD TRANSPONDER S APPROPRIATE OR RESTORE AS TO THE FAR END DSR LED ON THE FRONT PANEL THAT COMMUNICATION ARE OCCURRING ON FAR END OF THE TELE LINE VIA BMUX REPORT TO SEE IF IS BEING TO THE SEE NOTE 2 THE ON THE END TO SEE IF IS BEING TO THE SEE NOTE 2 1 IFCOMMUNICATION ARE REPORTED ON THE SIDE OF THE CONVERTERS MODEMS THEN TROUBLESHOOT AN OPEN CHANNEL OR BAD AS APPROPRIATE 3 THE RCV XYT LEDS TELCO FINISHES THE SYSTEM FUNCTION XMT LED ON THE MUST BE OFF YOU HAVE REACHED BLOCK THE FOLLOWING AT THE 1 COMM CHANNEL OPEN BAD TRANSPONDER S BAD FAR END MODEM BAD FAR END CONVERTER APPROPRIATE THE MODEM MODEM BMUX END YES PROBLEM WITH LINES CONTACT ACCORDANCE WITH THE AT THE OF THIS PAGE NO TELCO FINISHES THE SYSTEM FUNCTION NOTE TO TELEPHONE LINE TROUBLESHOOTER FSK modem being used To access digital a Bell type 202T The analog switch press down on the flat part of the front panel at the base of the visible on the modem switch sure to return the switches their normal positions after testing 4 2 89 Time Recorder Co l Simplex Plaza l Gardner Massachusetts U S A MUX2 51 003