Star Remote System Service Capabilities; Call Origination; Tone Generation - Nortel DMS-100 Series Maintenance Manual

Star Remote System service capabilities

Star Hub signaling maintains call processing activities by allowing the
functions of call origination, tone generation, digit collection, and ringing to
occur. The following paragraphs describe each of these activities.

Call origination

Star Hub and Star Module signaling transmits the on-hook and off-hook
signals that allow the host XPM to identify subscribers requesting service.
When a subscriber goes off hook, a voltage source in the Star Hub or Star
Module provides a steady flow of current through the transmitter. The remote
controller pack (RCP) processor in the Star Hub or the Star Module Control
(SMC) in the Star Module detects this current and sends an off-hook message
to the central office (CO). The CO
•
•
•
Depending on the type of telephone, the subscriber line transmits open pulses
or dual tone multi frequency (DTMF) signals through the Star Hub to the CO.
The CO analyzes the digits and determines an interoffice call was placed. The
calling end of the trunk will be seized and a connect signal, which is a
sustained off-hook signal, is transmitted forward to the called end of the trunk.
This signal indicates a request for service and continues while the connection
is held.

Tone generation

The host XPM provides all correct ring cadence tones. The Star Hub applies
these tones to subscriber lines when the Star Hub is in emergency stand-alone
(ESA) mode. The tones supported by the host are as follows:
•
•
•
•
•
•
•
uses the off-hook signal as a request for service
allocates a channel on a DS-1 link to provide service to the subscriber line
applies dial tone to the line
dial tone
audible ringing
warble tone
busy tone
reorder tone
receiver off-hook (ROH) tone
notify tone
DMS-100 Family NA100 Star Remote System XPM15 and up
Signaling for the Star Remote System 3-9