AEQ
PHOENIX STRATOS
28
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MODE: lets you choose between working with two single 64Kbps B channels (that you
can assign to different communication channels), or combine both channels in one
128Kbps channel (that will be used for just one communication channel).
Bit rate selection detail
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INTERFACE: allows you to choose between two connectors available on the SGA-03
module according to your geographic area and the ISDN protocol to be used: S (RJ45)
or U (RJ11) connector.
ISDN physical interface selection detail
The U interface links the telephone exchange to the subscriber; it is a two-wire interface
of the type used in analog telecommunications, and permits only a point-to-point
connection (a single device connected to the interface).
The S/T interface is obtained through the U interface by passing through a Network
Terminator (TR1) installed on the subscriber's premises; it is a four-wire interface that
permits the multipoint connection of up to seven devices.
In USA, telephone companies do not supply the TR1; it is up to users to install these
devices if they want them. The most normal situation is for the TR1 not to exist, and for
the access to be accomplished through the U interface. In short, in USA the usual
solution is access through the U interface unless the subscriber has requested or the
telephone company has installed a TR1 of its own volition (the TR1 is normally a little
box secured to the wall with a power supply and a luminous indicator of some type, into
which the two-wire outside line enters, offering RJ-45 outputs).
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PROTOCOL: this submenu enables you to choose between the two different ISDN
communication protocols available in the PHOENIX STRATOS, depending on your
geographic area and the connector selected in the previous step.
The options are: EURO-ISDN and NATIONAL-1.
ISDN protocol options
In USA, despite the presence of several protocols that are incompatible with each other,
there is, fortunately, one protocol that is relatively standardized (called National-1), and
which is usually available in all the telephone exchanges.
Selecting NATIONAL-1 enables the SPID (Service Profile Identification Number) option
in this same submenu. For further information, see ANNEXE B.
