Mitel MIVOICE OFFICE 250, Installation And Administration Manual, Page: 538 / 585

MiVoice Office 250 Installation and Administration Guide
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Table 76 summarizes the differences between standard and extended ring cadences for the various
types of single line phones used on the Mitel system in the United States.
Off Premises Extensions (OPX)
Off premises extensions are remote single line DTMF phones connected to the system through
telephone company OPX circuits or customer-provided circuits.
OPX phone users gain access to the features by hookflashing [recalling] and entering feature codes.
Hookflashing [Recalling] means to press and quickly release the hookswitch.
Some telephone company OPX networks do not recognize certain single line phone ring cadences
used in the system. This incompatibility results in an inability to provide certain ring signals to OPX.
Because of this, the system is equipped with a phone option (Extended Ring Cadences) that allows
the ring cadences be altered for individual single line circuits.
Another programming option, the OPX Gain Levels flag, allows the receive and transmit gains to
be automatically adjusted to improve OPX communication with the CO.
OPX circuits connect to IP SLA devices across T1/E1 spans.
IP Single-Line Adaptor
The IP Single-Line Adaptor (SLA) provides interface between a single Local Area Network (LAN)
port and one single line analog phones. For installation instructions, refer to the “Installation” chapter
in the
MiVoice Office 250 Installation Manual
.
Table 76: Standard and Extended Ring Cadences for Single Line Phones
Single Line Device Cadence Type Description
SLA or T1 OPX Standard IC Ring This is a repeating 2-second cadence that rings twice.
Each ring lasts 200 ms and is separated from the next
ring by 400 ms of silence. The remaining 1.2 seconds is
silent.
Extended IC Ring This is a repeating 6-second cadence that rings twice.
Each ring lasts 800 ms and is separated from the next
ring by 400 ms of silence. The remaining 4 seconds are
silent
Standard CO Ring This is a repeating 6-second cadence that rings once for
2 seconds followed by 4 seconds of silence.
Extended CO Ring Same as Standard CO Ring cadence.