Chapter 1 Introducing the V1553B V1553B UserÕs Manual
A considerable amount of the V1553B's circuits are contained in the BU61580 Advanced Communication Engine
(ACE) hybrid device.
Two ÒBNCÓ style twin-axial connectors per channel give an easy Òbayonet lockÓ connection of the shielded-
twisted-pair leads, having in each, a male and a female pin for the differential serial signals. The connector bodies
are isolated from the front panel and each other with isolation washers.
Behind each pair of the two front-panel twin-axial connectors of the V1553B, are two transformers providing an
option for balanced line transformer isolation, for improved noise immunity, etc. An option allows the center tap
of the output winding of either to be connected to the shield of their respective leads.
Four status LEDs on the circuit board provide status information of the V1553B.
An on-board mounted 16 MHz crystal oscillator allows an option for the V1553B to function independently of the
VMEbus SYSCLK signal, if desired, by simple jumper selection.
1.6 Features of the V1553B Module
The V1553B utilizes the BU61580 Hybrid module to meet the needs of Military specifications/applications.
The 1553 bus offers very fast (1MHz) Manchester II, Pulse Coded Modulation (PCM) on a serial bus, over
shielded twisted pair cables thus presenting a simplified interconnection, together with rigid standards, ensuring
high noise immunity and high degrees of fault isolation for military LANÕs, test and control systems, etc.
The single-height* size of this module and other PepCards allows a very compact VMEbus system to be created,
and if necessary, contained in smaller ÒTempestÓ cabinets than many of its contemporary 6U modules leading to a
considerable saving in both cost and size/weight.
1.7 Typical V1553B Applications
In conjunction with PEPÕs single board computers, e.g. the VSBC-4, the V1553B may be used as a very compact
control or monitoring computer in vehicle, ship, or aircraft-based applications.
Connecting VMEbus hardware and peripherals to 1553 systems in order to analyze or develop hardware/software
solutions between these two standards.
Providing VMEbus Interface to 1553 Òfield busÓ in MAP LAN networks.
Providing long sensor paths to Òdown holeÓ sensors in the oil drilling industry, where wear sensors encapsulated
into drilling bits can feed back data on the bit condition and/or geological data, such as changes in rock hardness,
etc.
*An optional 6U front panel permitting the V1553B to be used in double-height systems is available on request.
1.8 Functional Block Diagram of the V1553B
Page 1-4
© 1996 PEP Modular Computers
June 22, 1998
