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February 2004
0049-0119-500

MD1970A / MD1970A-DC /MD1970C Modem

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Summary of Contents for MD1970A

Page 1: ...February 2004 0049 0119 500 MD1970A MD1970A DC MD1970C Modem...

Page 2: ...or Test Pattern 12 CONNECTING A DTE 12 CONNECTING TO A PRIVATE LINE COMMUNICATION CIRCUIT 12 Connecting to a DC Power Source MD1970A DC 12 Connecting to an AC Power Source MD1970C 13 CHAPTER 3 LEDS A...

Page 3: ...s for power RS 232 control data status and test mode Models The BLACK BOX modems are available in three models The MD1970A is a desktop modem that comes with an AC power adapter for 115 230 VAC The MD...

Page 4: ...ware Your package should include at least one MD1970A or MD1970C modem one RJ 45 jack to 4 wire leased line cable and this Installation Guide If your package contents are damaged or missing please con...

Page 5: ...input connector A power switch for turning the modem on and off A fuse 3 8 amp 250 Volt slow blow A DB25 female connector for accommodating a DTE device An RJ 45 connector for connecting to a communic...

Page 6: ...nge the default jumper settings To change jumper settings push the two tabs on the back of the modem to open the modem cover and gain access to the jumper settings on the printed circuit board see Fig...

Page 7: ...Installing the Modem Figure 2 5 Modem Jumper Locations Page 7...

Page 8: ...und Connected Separate 10 S9 RTS CTS delay 8 ms 33 ms 59 ms 219 ms 10 S10 Carrier Detect delay 6 ms 23 ms 11 S11 Turnaround squelch time Enabled by jumper S4 8 ms 159 ms 11 S12 Soft Carrier turn off N...

Page 9: ...to maintain constant carrier from the master modem to all slave modems at all times after the initial training This enables the master modem to transmit data to the slave modems with no RTS to CTS de...

Page 10: ...s the default position of Disabled when operating on a 4 wire network It is also normally left in the default Disabled position when operating on a 2 wire network Strapping this jumper as Disabled inh...

Page 11: ...8 ms default 26 ms Jumper S12 configures the modem to either turn off the transmitter immediately upon release of Request To Send or send a Soft Carrier Turn Off signal of 900 Hz for 8 or 26 ms at the...

Page 12: ...wn under Telco Connector on page 19 Connecting to a DC Power Source MD1970A DC The MD1970A DC back panel accepts a DC voltage source from 10 to 53 VDC and provides 500 Volts isolation Figure 2 3 on pa...

Page 13: ...making this connection to the modem align the power adapter with the positive and negative markings on the modem rear panel Powering on the Modem To supply power to the modem place the POWER ON switch...

Page 14: ...ransmitter output of the modem is disconnected from the output coupling transformer and connected to the modem receiver input See Figure 3 1 DL Digital Loopback this position configures the modem to l...

Page 15: ...r are active during this mode Figure 1 Analog Loopback Test DTE DTE RECEIVER TRANSMITTER PAD TRANSMITTER RECEIVER Local Modem Analog LoopBack Mode RXD TXD 4 Wire Telephone Line Remote Modem Data Mode...

Page 16: ...re Telephone Line Self Test TM TX RX Amplifier Figure 3 3 Self Test DTE DTE TEST PATTERN TRANSMITTER ERROR CHECK RECEIVER Local Modem Send Test Pattern Mode 2 Wire Telephone Line Remote Modem Receive...

Page 17: ...e front panel test switch place the modem in Self Test mode 2 The TM indicator should turn ON If the indicator turns OFF or flashes errors are occurring Line and Modem Test The line and modem test ver...

Page 18: ...to 14 dBm in 2 dB steps RTS CTS delay 8 33 59 or 219 ms Carrier Detect delay 6 or 23 ms OFF to ON 6 On to OFF Digital interface EIA RS 232 C and CCITT V 24 Package Standalone UL approved Turnaround sq...

Page 19: ...Circuit CCITT V 24 Circuit Function 1 AA 101 Protective Ground 2 BA 103 Transmitter Data 3 BB 104 Receive Data 4 CA 105 Request to Send 5 CB 106 Clear to Send 6 CC 107 Data Set Ready 7 AB 102 Signal G...

Page 20: ...registration number Items b and d can be found on the unit s FCC label The ringer equivalence number REN is used to determine how many devices can be connected to your telephone line In most areas the...

Page 21: ...the specifications in Subpart B of Part 15 of FCC rules which are designed to provide reasonable protection against such interference when the equipment is operated in a commercial environment Operat...

Page 22: ...rato 12 Precauci n debe ser tomada de tal manera que la tierra fisica y la polarizaci n del equipo no sea eliminada 13 Los cables de la fuente de poder deben ser guiados de tal manera que no sean pisa...

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