91369 Service Manual 2-7
Setup
Cabling
Maximum Cable Lengths
The following cables are limited to the indicated maximum length:
• SDLC Cable — 12.2 m (40 feet) maximum (total length from the monitor to the last device on the bus). For
longer SDLC cable runs, contact a Spacelabs Healthcare Field Service Engineer.
• Video Cable — 30.5 m (100 feet) maximum (total length from the monitor to the last display).
• Ethernet cable (10/100BaseT) — 100 m (328 feet) maximum.
SDLC External Devices
External devices (for example, Flexport
®
system interfaces) can be connected to the SDLC bus. (In this
context, the term “external” means connected to the SDLC bus by cable via an external connector. This is in
contrast to modules, which are connected by inserting them into a module housing.)
If no supplementary module housings are present (in addition to the module slot integral to the monitor itself),
then external devices are connected directly to the SDLC connector of the monitor.
If one or more supplementary module housings are present, Flexport devices are connected to connector J2
on one of the 90499 or 90491 supplementary module housings, or J3 on model 90485. Refer to the Module
Housings and Power Supplies Service Manual (P/N 070-0680-xx).
If multiple module housings are present, external devices must be connected to the last module housing in the
daisy-chain; that is, the housing electrically farthest from the monitor on the SDLC bus. Even though multiple
connectors may be available, only the SDLC connector on the most distal module housing can be used for
connecting external devices. Do not use more than a single Flexport connector, regardless of how many
module housings are present.
If multiple Flexport interfaces are to be installed, they must be daisy-chained using the T-cable supplied with
those devices. Up to three Flexport interfaces may be connected in this way.
Warning:
Unreliable system operation will occur if the SDLC bus is not correctly terminated or the maximum
cable length is exceeded. Flexport interfaces must be attached to the most distal module housing
on the SDLC bus.
SDLC Cable Interconnection
To ensure electromagnetic interference (EMI) compliance, the appropriate Spacelabs Healthcare
9-pin connector must be used. Refer to the Module Housings and Power Supplies Service Manual
(P/N 070-0680-xx).
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