User`s guide

5
Step 2
Distribution Boards, Bracket
Kits, and Cable Kits
Switches and attenuators are connected
to the Agilent 34945A and L4445A
Microwave Switch/Attenuator Drivers and
the L4490A/L4491A RF Switch Platform
through distribution boards installed
on the 34945EXT module (see System
Interconnections Defined).
There are five distribution boards (Y1150A
– Y1154A) designed to allow Agilent’s
most popular switches and attenuators
to be driven directly. A sixth distribution
board, the Y1155A, is designed to drive
virtually any switch or attenuator by
providing screw terminals to connect to
relay coils and position indicators.
The distribution board required for each
switch/attenuator model and the number
of switches/attenuators
supported per board (shown in brackets [ ])
are listed in Table 1.
The Y115x distribution boards are passive;
they only provide socket headers or screw
terminals that interface external devices to
the 34945EXT. The distribution boards do
provide access to position feedback signals
that can be used to drive LED’s to visually
represent a signal path, for example.
Bracket and Cable Kit Usage
There are six bracket kits and three cable
kits available separately for switch/
attenuator installation and control (Table
1). The number of switches/attenuators
supported per kit is summarized in Table 2.
The bracket kits apply to the L4490A and
L4491A Each bracket kit contains hardware
for mounting the switch to the bracket and
for mounting the bracket assembly in the
chassis.
The cable-only kits are primarily used with
the 34945A and L4445A, but can also be
used with the L4490A and L4491A.
Figure 1. The Y1150A – Y1155A Distribution Boards
Table 2. Bracket and Cable Kit Usage
Kit
number
Number of
switches
supported
Control
cable
included
Usage Notes
L4490A/L4491A Bracket Kits
Y1170A 5 Yes L4491A Five brackets per kit. Cable is pre-assembled.
Y1171A 5 Yes L4490A Five brackets per kit. Cable is pre-assembled.
Y1172A 5 Yes L4490A
L4491A
Five brackets per kit. Cable is pre-assembled.
Y1173A 6 Yes L4490A
L4491A
Three brackets per kit. Two switches per bracket.
Cable is pre-assembled.
Y1174A 5 Yes L4490A
L4491A
Five brackets per kit. Cable is pre-assembled.
Y1175A 5 No L4490A
L4491A
Five brackets per kit. No cable provided.
34945A/L4445A Cable Kits
Y1157A 4 —
34945A
L4445A
L4490A
L4491A
Cable only – must be assembled.
See Table 1 for applicable switches and attenuators.
Y1158A 2 —
34945A
L4445A
L4490A
L4491A
Cable only – must be assembled.
See Table 1 for applicable switches and attenuators.
Y1159A 2 —
34945A
L4445A
L4490A
L4491A
Cable only – must be assembled.
See Table 1 for applicable switches and attenuators.