Black Box ME475A User Manual

ME475A
BLACK BOX
TD RD RTS CD
SPECIFICATIONS
Transmission Format: Synchronous or Asynchronous, 2-wire/half duplex or 4-wire/full or half duplex.
Interface: RS-232 (CCITT V.24) connection via DB25 female; Twisted-pair connection via RJ-45 or
terminal block.
Transmission Line: 2- or 4-wire UTP, 19 to 26 AWG.
Data Rates: Synchronous or Asynchronous at 1.2, 1.8, 2.4, 3.6, 4.8, 7.2, 9.6, 14.4, 19.2, 28.8, 38.4, 57.6,
(Switch-selectable)
Clocking: Internal, External, or Receive Recover.
Controls: Carrier Constantly ON or Controlled by RTS; RTS/CTS delay set to no delay, 7 ms, or 53 ms.
Applications: Point-to-Point or Multipoint.
Indicators: Bcolor LED's for TD, RD, RTS, and CD; Single LED's for Test, and Error.
RTS Anti-Stream Timer: 12.5 sec., 50 sec., or disabled (switch-selectable); Tolerance: +50%, -0.
Diagnostics: V.52-compliant bit-error-rate pattern (511/511E pattern) generator and detector with
error-injection mode; V.54 compliant--Local Analog Loopback and Remote Digital Loopback,
activated by front-panel switch or via RS-232 interface.
Transformer Isolation: 1500 V RMS.
Surge Protection: Silicon Avalanche Diodes, 600 watts RMS power dissipation @ 1 ms, with response time
of less than 1 ps.
Power Supply: Wallmount power supply: 120 VAC
Async/Sync Short Haul Modem
V.54 Test Modes
511 -
ERROR TEST Remote
Normal
Local
511E -
:
Description:
The Aysnc/Sync Short Haul Modem operates 2-wire (half-duplex) or 4-wire (full- or half-duplex), in synchronous or asynchonous modes,
over unconditioned telephone lines. The Modem has an extended range of 20 miles (32 km). It operates at 12 switch-selectable data rates to
57.6 Kbps. The modem always operates in sychronous mode between the local and remote modems; when connected to an asynchronous
RS-232 devices, the modem converts the asynchronous data to synchronous data.
The modem has several feautres to enhance overall performance: automatic equalization, automatic gain contrl, anti-streaming timer,
transformer isolation to guard against data loss because of ground-potential differences, and Silicon Avalanche Diode surge protection to
guard against data-line transients.
The modem features V.52-compliant bit-error-rate pattern tests and two V.54 test modes: local analog loopback and remote digital
loopback. The operator at the local end may test both local and remote modems, plus the line, in the digital loopback mode. Both RDL and
LAL modes can be controlled by a manual switch or vis the V.24/RS-232 interface.
INTRODUCTION:
TD
RD
RTS
CD
ERROR
TEST
TOGGLE
SWITCHES