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CHAPTER 1: Specifications

Cable Required —

(1) Multimode fiberoptic cable, 62.5-µm core

Interface —

EIA RS-232/CCITT V.24, DCE

Protocols —

Asynchronous or synchronous

Clock —

Internal or external from attached RS-232 device

Flow Control —

Transparent hardware (RTS/CTS and DTR/DSR

passed through from DTE) or local hardware or
software (RTS/CTS or X-ON/X-OFF), user-
selectable

Operating Mode —

Point-to-point

Speed —

Asynchronous: Up to 38.4 Kbps;
Synchronous: 2.4, 9.6, 19.2, 38.4, 56, 64, 192, or

256 Kbps

Maximum
Distance —

2.5 km (1.5 mi.) at all data rates,
5 km (3.1 mi.) at data rates of 64 Kbps or below

Modulation —

3B4B

Wavelength —

880 nm

Attenuation —

14 dB

LED-Responsivity
Minimum —

0.12 amps per watt

User Controls —

(2) External:

(1) Front-mounted rocker switch: Test;
(1) Bottom-mounted 8-position DIP switch:

Async/sync operation, data rates, clock source,

flow control

1. Specifications

Содержание MD640A-SMA-R2

Страница 1: ...s a day 7 days a week Call 724 746 5500 or fax 724 746 0746 Mail order Black Box Corporation 1000 Park Drive Lawrence PA 15055 1018 Web site www blackbox com E mail info blackbox com FEBRUARY 1996 MD640A ST R2 MD640A SMA R2 MD640AE ST R2 MD640AE SMA R2 MultiMode FOMs ST and SMA POWER Test Modes Remote Normal Local TD RD CD RTS MultiMode FOM ...

Страница 2: ...4 3 Configuration 5 4 Installation 8 4 1 Single Fiber Connection 8 4 2 RS 232 Connection 9 5 Operation 10 5 1 LED Indicators 10 5 2 Power Up 11 5 3 Loopback Test Modes 11 5 4 Power Down 12 6 Troubleshooting 13 6 1 Calling Black Box 13 6 2 Shipping and Packaging 13 Appendix RS 232 Pinout 14 ...

Страница 3: ...MULTIMODE FOMS ST AND SMA TRADEMARKS USED IN THIS MANUAL ST is a registered trademark of AT T Any other trademarks mentioned in this manual are acknowledged to be the property of the trademark owners ...

Страница 4: ...e RTS CTS or X ON X OFF user selectable Operating Mode Point to point Speed Asynchronous Up to 38 4 Kbps Synchronous 2 4 9 6 19 2 38 4 56 64 192 or 256 Kbps Maximum Distance 2 5 km 1 5 mi at all data rates 5 km 3 1 mi at data rates of 64 Kbps or below Modulation 3B4B Wavelength 880 nm Attenuation 14 dB LED Responsivity Minimum 0 12 amps per watt User Controls 2 External 1 Front mounted rocker swit...

Страница 5: ...ts with SMA suffix 1 SMA female Power For 120 VAC 60 Hz operation From wallmount power supply Input 115 VAC 60 Hz 100 mA Output 10 VAC 700 mA For 240 VAC 50 Hz operation From desktop power supply Input 230 VAC 50 Hz 100 mA Output 10 VAC 700 mA MTBF 125 000 hrs Maximum Altitude 10 000 ft 3048 m Temperature 32 to 140 F 0 to 60 C Humidity Up to 95 noncondensing Size 1 5 H x 4 1 W x 5 D 3 9 x 10 5 x 1...

Страница 6: ... km 3 1 miles 2 1 Features Synchronous or asynchronous operation Communicates point to point over a single optical fiber Local and remote test modes Asynchronous data rates up to 38 4 Kbps Synchronous data rates up to 256 Kbps Distances up to 2 5 kilometers 1 5 miles at any speed Distances up to 5 kilometers 3 1 miles at speeds of 64 Kbps or less Internal or external clocking Support for transpare...

Страница 7: ...n be set for internal or external from attached RS 232 device clock The MultiMode FOM features extended data rate circuitry that allows for single fiber distances between 1 5 and 3 1 miles 2 5 and 5 km Depending on which model you have you can connect optical cable with ST or SMA connectors to the FOM The MultiMode FOM encodes your data signals using 3B4B modulation then converts them to an 880 nm...

Страница 8: ...nternal controls you don t have to open the unit s case to configure the unit Figures 3 1 and 3 2 below and Table 3 1 on the next page show the location of the switch and the switch positions identities settings and functions Figure 3 2 Closeup of the DIP switch positions showing ON OFF settings and position numbers 1 ON 2 3 4 5 6 7 8 ON OFF Figure 3 1 The location of the DIP switch on the undersi...

Страница 9: ...cts of signal degradation over distance and allows communication over as much as 5 km 3 1 miles as opposed to the 1X setting s limit of 2 5 km 1 5 miles Table 3 2 at the top of the next page shows every possible setting for these four switch positions Position 6 Reset You can use position 6 to reset the MultiMode FOM without powering down the unit Move position 6 to ON to put the FOM in reset cond...

Страница 10: ...s switch position must be moved to the same setting on both FOMs If position 7 is set to ON the default setting the Multimode FOMs perform transparent hardware flow control by passing the RTS CTS and DTR DSR signal pairs from the attached DTEs across the modem link In this setting when one FOM drops the RS 232 RTS signal the other FOM drops the CTS signal and when one FOM drops the DTR signal the ...

Страница 11: ...gle Fiber Connection These short range modems are designed to work in pairs You ll need one at each end of a single 62 5 µm core multimode fiber cable Depending on the data rate setting you select your cable can be a maximum of 2 5 or 5 km long Connect the fiberoptic cable to each MultiMode FOM using a single connector either ST or SMA type Figure 4 2 below shows a closeup of both connector types ...

Страница 12: ... a PC host terminal etc use a straight through RS 232 cable To connect the MultiMode FOM to a DCE Data Communications Equipment a modem multiplexor etc use a cross pinned RS 232 cable of the null modem type Whether the cable is straight through or cross pinned it must have a male DB25 connector on the FOM end ...

Страница 13: ... digital test The TD and RD indicators blink red or green in response to data activity transmitting data or receiving data respectively Red indicates a low level of RS 232 logic green indicates a high level of RS 232 logic These LEDs will continuously glow red if the RS 232 cable connections are correct and the RS 232 device to which the FOM is attached is not transmitting or receiving data this i...

Страница 14: ...front panel 5 3 1 LOCAL LOOPBACK The local loopback test is an analog test that checks the operation of the local MultiMode FOM and is performed separately on each unit During this test any data sent to the local MultiMode FOM by the attached RS 232 device will be echoed back to that device For example characters typed on the keyboard of a local terminal will appear on the terminal screen To perfo...

Страница 15: ... s screen after having been passed to the remote FOM and looped back To perform a remote loopback test follow these steps A Activate remote loopback by moving the remote MultiMode FOM s front panel toggle switch up to the Remote setting this FOM now automatically echoes data back across the fiberoptic line to the local FOM The remote unit s Test LED should glow As with the local loopback test the ...

Страница 16: ...d duration of the problem When the problem occurs The components involved in the problem Any particular application that when used appears to create the problem or make it worse 6 2 Shipping and Packaging If you need to transport or ship your FOM Package it carefully We recommend that you use the original container If you are shipping the FOM for repair make sure you include its power supply If yo...

Страница 17: ...24 25 FG Frame Ground TD Transmit Data RD Receive Data RTS Request to Send CTS Clear to Send DSR Data Set Ready SG Signal Ground DCD Data Carrier Detect 14 Transmitting Timing 16 Receiving Timing 18 19 Data Term Ready DTR 21 22 23 Transmitting Timing LXC 25 STANDARD DCE SETTING DIRECTION 14 From FOM 16 From FOM 18 19 To FOM 21 22 23 To FOM 25 DIRECTION To FOM From FOM To FOM From FOM From FOM From...

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