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Chapter 2 - Technical Information
© Polycom, Inc. 25
ISDN Switches
Depending on the type of ISDN lines you are using, your service
provider may assign zero, one, or two SPIDs per line. Refer to
Table 2-15 below.
Automatic Quad BRI Software Update
The Quad BRI is expected to have a software version at least as
recent as that of the system to which it is connected. If, upon reboot,
the system detects an older software version on the Quad BRI, it
automatically updates the Quad BRI software. The download is
accompanied by an explanatory message.
Caution
Do not turn off your system during the download process.
Table 2-15. ISDN Switch Types and SPID Allocations
Switch Type SPIDs Allocated
AT&T 5ESS Custom None
AT&T 5ESS NI-1 1 per B-channel
NT DMS-100 NI-1 1 per B-channel
NI-2 1 per device
Siemens EWSD NI-1 1 per B-channel
Siemens EWSD NI-2 1 per device
International (outside United States or
Canada)
None