ZETRON 748, Техническое руководство

Страница: 57 / 259

Operation
025-9368H 43
Access ANI
Sign-on in the Model 748 consists of the user's Access ANI code followed by a steering digit (if more
than one privilege is enabled). Once a valid first digit has been received, the remaining digits must
be received within the set timing requirements. If
Fast ANI access is disabled (default), digits must
be at least one digit per second. If Fast ANI access is enabled, digits must be at least five digits per
second. The Model 748 also tone/code validates the incoming ANI. If the timing requirements are
violated or a NO MATCH returned from the ANI decoder, the ANI decoder is turned off for two
seconds or until COR is dropped. This is to prevent an embedded ANI in a string by someone trying
to gain unauthorized access to the interconnect.
NOTE
To prevent ANIs from being repeated out over the channel during dispatch, repeat audio is muted
after the first digit of a valid ANI.
Short Sign-on
Short sign-on can be a very convenient way to access the Model 748. Any user programmed with a
single digit
Access ANI is considered Short sign-on. Any valid ANI digit (0 - 9, A - D, *, #) can be
used for short sign-on. Typically, a short sign-on user is setup with only one privilege (removing the
need for a steering digit). The default privilege for short sign-on is Mobile-to-Phone. A short sign-on
ANI has a minimum digit duration requirement of 500 milliseconds to be considered valid. Short
sign-on is also tone/code validated. Short sign-on uses a one second validation timer. Before the
Model 748 validates a short sign-on, this timer must expire or COR and/or tone/code validation must
drop with no other digit being decoded.
ANI Sign-on
ANI sign-on is used in systems where Airtime billing and Call Detail records are used. It also
provides greater security in preventing unauthorized access to the system. Any user programmed
with a multi-digit
Access ANI (two or more digits) is considered an ANI sign-on user. In larger
systems with many users requiring access to different privileges, this provides a way to identify each
user on the system. Typically ANI sign-on is used with a trailing steering digit to select a privilege.
If only one privilege is enabled, then a steering digit is not required. All multi-digit ANIs are
checked for conflicts during programming. There is no minimum “on” time requirement for multi-
digit ANIs.
Steering Digits
If a user has more than one privilege enabled (Mobile-to-Phone, Mobile-to-Mobile, or ANI Mobile-
Repeat), a trailing steering digit is required. This differs from earlier Zetron interconnects in that the
steering digit could be leading or trailing. The purpose of the steering digit is to let the interconnect
know which privilege the user wishes to use. If it is desired to not use steering digits, a user could
have the steering digit be part of the
Access ANI . This works by entering the user multiple times in
the database. One for each privilege or function granted.