Hardware Configuration
2
Agilent 34945A Microwave Switch/Attenuator Driver Module User’s Guide
19
PC to 34945A.
When connecting the PC
directly
to the 34980A/34945A, the
LAN cross-over cable (p/n 5061-0701) provided with the 34945A is used. If
your PC supports Auto-MDIX or contains a LAN card with Gigabit data
transfer rates, the cross-over cable is not required. A standard LAN cable may
be used instead.
For network configurations (private or site) that include a LAN switch or
router between the PC and 34980A, standard LAN cables are used.
Do not use
the cross-over cable.
GPIB and USB connections to the 34980A are also available.
34945A to 34945EXT.
The 34945A is connected directly to the master
34945EXT using the 9-pin D-Sub extension cable (p/n 8121-1289). 34945A -
34945EXT communication plus the 34945EXT’s +24V supply voltage is
provided through this connection.
34945EXT to 34945EXT.
Multiple 34945EXT modules (up to eight per 34980A)
are connected using standard LAN cables. The first cable must be connected
between the master (first) 34945EXT module’s Expansion Bus Port 1 and
either Expansion Port 1 or Port 2 of the second (slave) 34945EXT module. The
Expansion Ports of all subsequent slave 34945EXTs are interchangeable.
34945EXT to External Power Supplies.
All
slave 34945EXT modules
must
use
an external power supply or supplies. The 34945EXT supports supply voltages
of +24V, +12V, and +5V. The supply voltage applies to all distribution board
banks on the 34945EXT.
The 34945EXT Module
Microwave switches and attenuators are connected to the 34945A
configuration through distribution boards (Y1150A - Y1155A) installed on the
34945EXT module (Figure 2-2).
The 34945EXT is divided into four banks organized by channel number. Any
distribution board may be installed in any bank, and multiple distribution
boards of the same type may be installed on the same 34945EXT module.
Distribution boards can be installed or removed with the 34945A turned on;
however, the channel drive source (Figures 4-2, 4-3) must be off.
The “I/O ACCESS” LED on the EXT module indicates communication
sequences between the 34945A and the 34945EXT.
The Y1156A Verification Board
The optional Y1156A Verification board (not shown) is used to verify the signal
path from the PC to banks 1-4 on the 34945EXT. Verification of the path is
recommended before connecting switches or attenuators to the distribution
boards, or if a problem is suspected. See Chapter 4 for more information.
