XEISDNU5 Ver la hoja de datos (PDF) - Xecom
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XEISDNU5 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 local 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 XEISDNU5 provides a simple means for
designers to implement an internal TA function without dedicating an entire board and a significant firmware
investment to this purpose.
Terminal Adapter Function
The XEISDNU5 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 four
passive components must be added to implement the hardware interface, signaling and protocols for the
North American ISDN standard interface to the local telephone company.
When used alone the XEISDNU5 module presents a high speed digital data channel to the local host
equipment through a RS-232E ready* serial interface. This channel can be configured by the designer or
user for up to 64k bps synchronous transmission or up to 115,200 asynchronous operation (limited by the
speed of the host serial interface).
When combined with the XEISDNP Analog Telephone Equipment Interface, the XEISDNU5 can provide
either B channel ( on the same physical ISDN line) for simultaneous use by an independent analog phone,
fax, or modem designed 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.
Modes of Operation
Application Mode
The normal mode of operation of the XEISDNU5 is Application Mode. This would typically be the only
mode visible to the equipment end user. When the CFG/SDO (pin 10) is pulled high, the XEISDNU5
module is in the Application mode. The ISDN configuration and control program supplied by XECOM or the
equipment designer’s specially developed control program will boot-up upon power-on. In this mode the
control program can occupy up to 240K x 16 of the 256K x 16 Flash memory.
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XEISDNU5
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