BERT
LOOP
Multi-Function
Line Driver
ME657A
BLACK BOX
511/E RDL
NORMAL
511 LAL
SPECIFICATIONS:
Interfaces: Serial--EIA RS-232/ITU-TSS (CCITT) V.24;
Line--Two- or four-wire telco
Protocol: Synchronous or Asynchronous
Clock Source: Internal, External (from DTE), or Received (from other Card) (user-selectable).
Data Format: Word length (including start bit, data bits, stop bits, and parity bit) must equal 8, 9, 10 or 11 bits
(user-selectable).
Flow Control: Transparent to all types of software (X-ON/X-OFF, robust X-ON/X-OFF, etc.) flow control; can be set
to support hardware flow control.
Operating Mode: Two-wire half-duplex or dour-wire full- or half-duplex (user-selectable).
Data Rate: 1,200 to 38,400 bps.
Isolation: 1500 volts RMS minimum using custom transformers.
Surge Protection: Silicon Avalanche Diodes.
Maximum Surge Protection: 600 watts dissipated after 1 msec.
User Controls: (2) Top-mounted toggle switches: LOOP (Remote digital or Local Analog Loopback), BERT (511 or
511/E V.52 diagnostics:
(2) Bottom-mounted 8-position DIP switches: (1) for data rate, clock source, protocol, and carrier control;
(1) for 2- or 4-wire operation, diagnostics, RTS/CTS delay, signaling-rate range, and word length.
Indicators: (2) Top-mounted LED's: Test (next to LOOP Switch), and ERROR (next to BERT Switch).
Diagnostics: ITU-TSS V.54 remote digital and local analog loopbacks; ITU-TSS V.52 BERT testing.
Connectors: (1) DB25 male/female (depending on model chosen); (1) 5 screw terminal block.
Power: From EIA RS-232 interface; Consumption: 56 to 70 mw
OFF
OFF
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
SW1
SW2
INTRODUCTION:
The Multi-Function Line Driver (MFLD) is a carrier-controlled short-range modem that requires no AC power or batteries. The
MFLD operates across two wires (half-duplex) or four wires (full- or half-duplex), communicating with DTE's synchronously or
asynchronously, up to a maximum range of 12 miles (19.3 km). You can set the MFLD to any of twelve data rates form 1.2 K to
38.4 Kbps.
Multi-Function Line Drivers always communicate with each other synchronously. When connected to an asynchronous RS-232
device, an MFLD performs synchornous/asynchronous conversion.
The Multi-Function Line Driver has several features that enhance its overall performance, including automatic equalization,
transformer isolation, and Silicon Avalanche Diode surge protection. The MFLD also has strong diagnostics: It features V.52-
compliant bit-error-rate (BERT) pattern tests and two V.54 test modes.
The Multi-Function Line Driver is housed in an ABS plastic case and comes with either a male or female DB25 connector and a
terminal block with strain relief.
CONFIGURATION
:
The Multi-Function Line Driver has two 8-position DIP switches-- SW1 and SW2--mounted on its underside. These configuration
switches allow you to select data rates, clocking methods, V.52 and V.54 test, word lengths, extended signaling rates, sync or
async protocol, and 2- or 4-wire operation.
ME657A-M/F
XMT
RCV
G
