Keithley 708B Reference Manual page 61

Section 2: General operation
One-to-one connection
A one-to-one connection using a network crossover cable connection is similar to a typical RS-232
hookup using a null modem cable. The crossover cable has its receive (RX) and transmit (TX) lines
crossed to allow the receive line input to be connected to the transmit output on the network
interfaces. With most instruments, this is only done when a single instrument is being connected to a
single network interface card.
The Models 707B and 708B support Auto-MDIX and can use either normal Ethernet CAT-5 cables
(patch) or crossover cables. The instrument automatically adjusts to support either cable.
One-to-many connection
With an Ethernet hub, a single network interface card can be connected to as many instruments as
the hub can support. This requires straight-through network (non-crossover) cables for hub
connections.
The advantage of this method is easy expansion of measurement channels when test requirements
exceed the capacity of a single instrument. With only the instruments connected to the hub, this is an
isolated instrumentation network. However, with a corporate network attached to the hub, the
instruments become part of the larger network.
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Figure 35: One-to-one connection with a crossover cable
Figure 36: One-to-many connection using a network hub or switch
Models 707B and 708B Switching Matrix Reference Manual
NOTE
707B-901-01 Rev. A / August 2010