SDN and ACC System Level Troubleshooting
3-5
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Obtain a basic understanding of the customer’s system architecture and
topology, and familiarize yourself with the SDN configuration.
Review the instrument branch assignments, care unit definitions, and IC
tuning ranges. Pay particular attention to the configuration of bedsides: to
which IC they are hard-wired, and where they are being monitored.
Review the configuration of IC groups.
If the system configuration documentation is not available, use the branch
number assignment label located inside the ACC and the Network Test to
review the SDN system configuration.
STEP #2: Examine System and Gather Symptoms
An instrument using the SDN such as IC or bedside is more likely to be the
source of a problem than the SDN hardware such as the interconnecting
cables or the ACC. With this in mind, start by looking for the obvious
product malfunctions. To do this, use the resources available and evaluate
the results.
• Assure that the instrument is SDN connected.
• Examine INOP messages and error codes.
• Check FIRE AXE and OVERFLOW LEDs in the ACC.
SDN Connections
Evaluate the results of the resources listed above to determine if there is
an SDN or non-SDN problem before continuing with this procedure.
SDN Error Messages
and Error Codes
The following messages can be found at the bedside, the central station, or
the telemetry mainframe.
Table 3-1: SDN Error Messages
SDN Error Messages Description
SDN COMM FAILURE —
DUPLICATE BED
Indicates there is another bed on the system
using the same bed number as this bed. No
data is transmitted on SDN. Message appears
at top of screen.
SDN COMM FAILURE —
ILLEGAL BED NUMBER
Indicates this bed is not connected to a
branch in the range #1 through #24. No data
is transmitted on SDN. Message appears at the
top of the screen.
SDN EQUIP MALF Indicates disruption to SDN communication.
Problem may be in this instrument or in SDN.
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