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Theory of operation
The Standard and Advanced Interface Boards receive +3.3 V and + 5V supply voltages from the
DC/DC board via the CPU board. In addition the Advanced Interface Board receives the VSYS
supply voltage.
The VSYS OPTION voltage is provided for a PDM through the DB9 ePort connector. Once the
PDM is detected and if the VSYS ePort voltage is not enabled, the VSYS OPTION's circuit breaker
is enabled by a control signal from the PMC.
The external connectors have ESD protection. RJ-45 connectors provide isolation.
Figure 6
Advanced Interface Board block diagram
Synchronization connector
The synchronization connector provides analog ECG and invasive pressure outputs and a
digital marker-out signal for external user-supplied equipment, e.g., a defibrillator or an
intra-aortic balloon pump. This connector does not operate with the PDM module.
See
Synchronization connector test
in Maintenance chapter for details about the pin layout.
WLAN
The optional IEEE 802.11a/b/g WLAN client radio enables wireless network communication in
the 2.4 and 5.1 GHz frequency bands.
The Compact Flash (CF) WLAN client radio connects to the CF socket in the CPU board. The two
internal dual-band antennas are attached to the front unit assembly.
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