XEISDNS データシートの表示（PDF） - Xecom
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XEISDNS Datasheet PDF : 10 Pages
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Design Considerations
ISDN Capability
Integrated Services Digital Network (ISDN) is a powerful, flexible, high-speed service now available from most lo-
cal phone service providers in North America, Asia, and Europe. It provides two 64k bps digital bearer channels (B
channels) and one 16k bps signaling channel (D channel) over a single pair of copper wires. Typically the installed
base of subscriber loop wiring is adequate for this service, making ISDN the most cost effective means of delivering
high speed digital dial-up service to homes and businesses.
Because ISDN is a digital service, connection of computer equipment does not require a modem like a conventional
analog line. However a terminal adapter is required to translate the physical signal levels and the protocols of the
Data Terminal Equipment into those of the ISDN lines and switches. External ISDN Terminal Adapters have been
available for some time. The XEISDNS provides a simple means for designers to implement an internal TA func-
tion without dedicating an entire board and a significant firmware investment to this purpose.
Terminal Adapter Function
The XEISDNS integrated ISDN Terminal Adapter Module is designed to provide a compact, simple design solution
for adding ISDN service access to industrial, medical, computer, business, and consumer products which need to
communicate with remote computers or networks at high data rates. Only three passive components (using the
APC14103 transformer) must be added to implement the hardware interface, signaling and protocols for the Euro-
pean ISDN standard interface.
When used alone the XEISDNS module presents a high speed digital data channel to the local host equipment
through an RS-232E-ready (TTL) serial interface. This channel can be configured by the designer or user for high
speed synchronous or asynchronous applications. Async Inverse Multiplexing (AIM) or Multi-link PPP provides up
to 115.2k bps asynchronous throughput. BONDING protocol provides a 128k synchronous channel.
When combined with the XEISDNP Analog Telephone Equipment Interface, the XEISDNS can provide either B
channel ( on the same physical ISDN line) for simultaneous use by an independent analog phone, fax, or modem de-
signed for “Plain Old Telephone Service” (POTS). Thus the user can place voice calls over the same ISDN line as
data calls, and his investment in existing analog phone equipment is preserved.
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XEISDNS
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