Dbu Options For Isdn Card; Switch Type; Dbu Passcode - ADTRAN DSU IV ESP User Manual

DBU Options for ISDN Card

Switch Type

This option selects the type of telco CO switch providing the ISDN
service. There are three options for ISDN switch types:
•
•
•

DBU Passcode

The dial backup passcode adds an additional level of security to the
DSU IV ESP. A passcode of one to ten characters can be
programmed into the unit.
When a dial backup connection is established, the originate unit
transmits a pre-programmed passcode to the answer unit over the
dial backup connection before the connection is considered valid.
The answer unit compares the received passcode to a pre-
programmed passcode. If the passcode matches, the receive unit
sends a P
line. If the passcode does not match, the receive unit sends an
Invalid Passcode message to the originate unit and terminates the
dial backup connection. If a passcode is not received by an answer
unit with passcode enable, or if the P
received by an originate unit with passcode enable, the dial backup
connection is terminated.
61204011L1-1
AT&T 5ESS
NT DMS-100
National ISDN
OK message to the originate unit and goes on-
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DSU IV ESP User Manual
Chapter 9. Configuring Dial Options
OK message is not
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