3com 4000 Manual De Usuario
Descriptions of I/O Cards
C-3
Figure C-2 Synchronous I/O Card Major Components and Port
ISDN Cards
The S/T and U AccessBuilder ISDN adapter cards each have four ports.
The U version, with an integrated NT1, is designed for direct
connection to ISDN lines in North America, while the S/T version is
designed for use in Europe and Japan. The S/T card connects to a
network terminator unit, which in turn, connects directly to the ISDN
line.
The U version, with an integrated NT1, is designed for direct
connection to ISDN lines in North America, while the S/T version is
designed for use in Europe and Japan. The S/T card connects to a
network terminator unit, which in turn, connects directly to the ISDN
line.
Three status indicator are located to the left of each port (because both
cards look similar, only one is shown)
cards look similar, only one is shown)
Figure C-3 ISDN Basic Rate Interface (BRI) Module
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