Racal Instruments 1260-100, Manual, Page: 46 / 53

1260-100/101 Adapt-a-Switch Carrier Module User Manual
B-5
1260-101 THEORY OF OPERATION
General
Power Filtering
The power is filtered before reaching either the backplane or Option-01T. The fuses, F1 through
F3, are of the surface-mount type. The fuses used are as follows.
FUSE MANUFACTURER
MANUFACTURER’S
PART NUMBER
RATING
(AMPS)
RACAL PART
NUMBER
F1 Wickmann USA, Inc. 418 2100000 10 921545
F2 Wickmann USA, Inc. 417 1315000 3.15 921546
F3 Wickmann USA, Inc. 417 1315000 3.15 921546
Signal Connections
Connectors P1 and P2 connect to the VXIbus backplane. Connectors J1 and J2 connect to the
Option-01T.
The Option-01T accesses the VXI Local Bus via J2C (third row of connector J2). From P2, the
local bus signals go to the Mezzanine module, which uses them to interface the Option-01T to the
plug-ins.
If an Option-01T is not installed on the Mezzanine, then the Local Bus Jumper Assembly (P/N
405951) must be installed onto connector J2. The local bus signals from an external Option-01T
then flow through the Mezzanine as follows: The signals enter the Mezzanine on P2A (P2, row A).
The Mezzanine connects them to J2A. The jumper assembly then connects them to J2C. The
Mezzanine connects them to P2C, which connects to the VXI backplane.
Unlike the 1260-Series switch modules, it is not necessary to install the Bus Grant Jumper
Assembly (P/N 405951-003) on connector J1 when the Option-01T is not installed. This is because
the Mezzanine provides the same connections on P1B. However, installing the Bus Grant Jumper
Assembly causes no problems.
Power Distribution
The Mezzanine distributes power the two plug-in slots.