Black Box ME260A, Owner'S Manual

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CHAPTER 2: Introduction
2. Introduction
2.1 Functional Description
The Modular Modem Eliminator is a universal interface converter that can be
used to interface between two synchronous data communication equipment units
that have incompatible interfacing characteristics. For this purpose, the Modular
Modem Eliminator can perform the function of an Interface Converter, Modem
Eliminator, or Elastic Buffer. You select the required function, and you can easily
change the function whenever system requirements change.
2.2 Equipment Versions
For maximum flexibility and versatility, equipment construction is modular, and
consists of one main unit and two plug-in interface modules. The plug-in modules
can be easily changed in the field, whenever the interface on either side must be
changed.
2.2.1 M
AIN
U
NIT
The main unit includes the internal power supply and the central control circuits.
The main unit is available in two models:
• Modular Modem Eliminator, 115 VAC (part number ME260A)—this model
can operate at data rates up to 2048 kbps. For applications that require the use
of the Modular Modem Eliminator internal clock source, the available data
rates are 48, 56, 64, 112, 128, 256, 384, 512, 768, 1024, 1544, and 2048 kbps.
For applications that do not require the use of the internal clock (interface
conversion, for example), the Modular Modem Eliminator can operate at any
rate up to 2.048 Mbps.
• Modular Modem Eliminator, 230-VAC (part number ME260AE)—this model
is identical to the ME260A, except that it operates at 230-VAC.
2.2.2 P
LUG
-
IN
I
NTERFACE
M
ODULES
The interface modules perform the interface conversion and, where applicable,
(for ITU G.703 modules) the extraction of the clock signal. There are two groups
of interface modules: general-purpose interface modules and G.703 interface
modules.