Inter-Tel AXXESS Manual page 586

System Features
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INTER-TEL AXXESS
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Purchasing T1 Services
10.27 When purchasing a T1 trunk, there are several variables involved, depending on the T1
application required. (See SPECIFICATIONS,
the following:
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Page 5-60
MANUAL VERSION 11.0 – May 2008
AT&T Unbanded OUTWATS
Nortel Private Network
Nortel INWATS
Nortel OUTWATS
Nortel Foreign Exchange
Nortel TIE trunk
Card framing type: The type of framing scheme used by the T1 trunks connected to
the card can be D4 Superframe (normally used for voice transmissions) or Extended
Superframe (ESF is usually used for data transmissions).
Zero code suppression scheme: The T1 trunk zero-suppression scheme (that limits the
number of consecutive zeroes in transmissions) for the trunks on the T1 or T1/E1/PRI
card can be AMI (Bit 7), Bipolar Eight Zero Substitution (B8ZS), or None. The T1/PRI
card supports B8ZS or None.
ISDN switch type: (Used for PRI-equipped cards only) The phone system supports pri-
mary-rate B-channels. However, the system is designed to support only AT&T 4ESS
Custom, AT&T National ISDN 2, and Private Networking switch types. No other
switch types are supported by the system.
Line build-out (LBO): The LBO attenuation of the T1 trunk connected to the card
must be designated in programming. This value is determined by the distance to the
nearest public network T1 repeater.
Reference clock programming: If the T1 Card is connected to the public network, the
card is automatically designated as a slave clock (the public network always acts as the
master clock and one card provides the system reference clock). If the card is not con-
nected to the public network, but is instead connected to another T1 Card or a card in
another telephone system, it can be a master clock or a slave clock (in relation to the
card on the other end).
Timers: (Timers are programmed only for PRI-equipped cards.) The ISDN timer
default values have been carefully selected to ensure proper system operation under
most circumstances. Occasionally, one or more of the timers may need to be adjusted.
CO Provides Progress Tones: (Used for PRI-equipped cards only) When the system
provides local ringback, some central offices (particularly in Europe) take too long to
send the system the connect message when a call is received. When the CO connects a
call too slowly, the user can answer before the caller is on the line, causing the caller to
miss the greeting (such as "Welcome to Inter-Tel. How may I help you?"). If the CO
Provides Progress Tones flag is enabled, the system does not provide local ringback.
Instead, the system connects the call to the line and the caller hears CO ringback. That
way, when the called party answers, the calling party is already on the line. The flag is
disabled by default.
page 2-49, for details.) The variables include
Purchasing T1 Services