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Operates in async orsync mode at data rates from19.2 to 256kbps.

Supports 1300-nm single mode fibre or 850-nmmultimode fiber connections.

RS-530 digital interface.

Diagnostic V.54 loops and built-in V.52 BERT.

K eep your long-range data linkssecure with the Sync/Async

Fibre Optic Modem from BlackBox. It provides a fibre linkbetween computers, routers,multiplexors, and other data-communications devices.

This handy modem adapts tomeet your needs: it operates at16selectable synchronous orasynchronous data rates from19.2 kbps to 256 kbps.

The Fibre Optic Modemconverts electrical signals from

DTEequipment into opticalsignals via an infrared light-emitting diode. At the oppositeend of the fibre, the optical signalsare converted back into RS-530electrical signals.

Link your RS-530 datacomm devices over 850-nm multimode or 1300-nm single-mode fibreoptic cable.

Key Features

SYNC/ ASYNC FIB RE OPTIC M ODEM

The Fibre Optic Modem isdesigned to operate with thefollowing sizes and grades of cable:

•850 nm for use withmultimode fibres, or

•1300 nm for use with single-mode fibers.

Fibre optic cable providesimmunity against electricalinterference, such aselectromagnetic interference(EMI) and radio-frequencyinterference (RFI), spikes, anddifferential ground loops. Even inhazardous or hostile environ-ments, fibre optic cable maintainsa secure link and protects against

sparking and lightning. The Fibre Optic Modem

provides three clocking modes formaximum flexibility:internal clock,

receive loopback clock, andexternal DTEclock.

What’s more, the Fibre OpticModem uses a Phase LockedLoop (PLL)circuit to recover jitter-free data and clock from theoptical signal.

V.54 diagnostics are used forlocal analog and digitalloopbacks, and remote digitalloopback. The loopbackcommands are controlled eitherby a manual switch, or via the DTEinterface signals. A front-panelswitch generates an internalpseudo-random test pattern

(511-bit) according to the ITU V.52standard, for testing end-to-endconnectivity. An Error LEDflasheswhenever the Modem detects abit error.

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•Sync/Async Fiber Optic Modem

•115- or 230-VAC Power Supply

•Users’ Manual

Operating Wavelength: ME555A(E):1300 nm for single-mode fiber;ME556A(E):850 nm for multimodefiber

Transmission Line: Dual fiber opticcable

Speed: Synchronous:Up to256kbps; Asynchronous:Up to115.2 kbps

Fiber Optic Interface: ST®

connectors

Protocol:Synchronous orasynchronous

Indicators: (7)LEDs:Transmit Data(TD), Receive Data (RD), Requestto Send (RTS), Data CarrierDetect (DCD), BERtest error(ERR), Power (PWR), Loopbackmode or BER(TEST)

Interface: RS-530

Connectors: ME555A(E):(2)ST for1300-nm single mode, (1)DB25female for RS-530;ME556A(E):(2)ST for 850-nmmultimode, (1)DB25 femaleforRS-530

Diagnostics: Complies with ITUV.54standard:

Digital Loopback: Local Digital (DIG)activated by a front-panel switch;Remote (REM)activated by afront-panel switch or by DTEinterface signals (RS-530);

Local Analog Loopback: Local(ANA) activated by a front-panelswitch or by DTE interfacesignals

BERT: Generates and detects apseudo-random BERT511-bitdata pattern; The ERRORindicator turns on for any biterror detected on the receiveddata

Timing Elements: Receive clock:Derived from the receive signal;

Transmit clock:Derived from 3alternative sources includinginternal oscillator (INT), externalfrom the DTE(EXT), or recoveredfrom the receive signal loopedback as a transmit clock (RCV)

Temperature Tolerance: 0 to 50°CHumidity:Up to 90%

noncondensing

Power Ranges: Typical outputpower:-18 dBm for 850 nm or1300 nm (62.5/125 µ); Receiversensitivity:-48 dBm for 850 nm,-50 dBm for 1300 nm; Dynamicrange:36 dB

Power Supply: ME555A, ME556A:115VAC, 60 Hz; ME555AE,ME556AE:230 VAC; 47-63 Hz;5VA

Size: 4.3 x 24.4 x 19.3 cm

Weight: 1.4 kg

Wh at t he Package Includes

Specifications

Ordering Information ITEM CODE

Sync/Async Fibre Optic ModemST for 1300-nm single mode, RS-530

115-VAC................................................................ME555A230-VAC..............................................................ME555AE

ST for 850-nm multimode, RS-530115-VAC................................................................ME556A230-VAC..............................................................ME556AEBlack Box offers the best warranty program in the

industry—Fido Protection®. For more information,requestFaxBack 22512.

Recognize any of thesesituations?

•You wait more than 30minutes to getthrough to avendor’s tech support.

•The so-called “tech” can’t

help you orgives you thewrong answer.

•You don’t have a purchaseorder number and the techrefuses to help you.

•It’s 6 p. m. and you need help,but your vendor’s tech

support line is closed.According to a recent surveyby Data Communicationsmagazine, 90% of networkmanagers surveyed saythatgetting the technical support

they need is extremely importantwhen choosing a vendor. Buteven though network managerspay anywhere from 10 to 20% of their overall purchase price for a

basic service and supportcontract, the technical supportand service they receive falls far

short of their expectations—andcertainly isn’t worth what theypaid.

At Black Box, we guaranteethe best value and the bestsupport. You can even consult our Technical Support Experts beforeyou buy if you need help selecting

just the right component for yourapplication.

Don’t waste time andmoney—call Black Box today.

Why Buy From Black Box? Exceptional Value.Exceptional Tech Support.Period.

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