Mitel MIVOICE OFFICE 250, Installation And Administration Manual, Page: 69 / 585

Product Description
41
With a system installed in the United States, an SLA can also be used for connecting two Direct
Inward Dialing (DID) trunks—or, one single line phone and one DID trunk. For more information on
using DID trunks, refer to the
MiVoice Office 250 Features and Programming Guide
. SLAs are
shipped with both ports set for single line device operation. Before connecting a DID trunk, be sure
to open the unit and set the corresponding port for DID operation. Also, if necessary, adjust the
hybrid balance setting to better accommodate longer loop lengths. For installation instructions, see
the Installation chapter.
AC-ringing off-premises extensions can be connected directly to the SLA circuit. E
xternal
high-voltage ringing adapter (HVRA) units, power supplies, and ring generators are
not
needed.
Each SLA, whether used for single line sets or DID trunks or both, is powered by its own AC
transformer. Also, SLAs have two self-correcting thermistors. If a short circuit causes a thermistor
to open, it will automatically close when the short is removed.
Data Port Modules
The Personal Computer Data Port Module (PCDPM) and Modem Data Port Module (MDPM) are
connected to appropriate digital telephones to provide hard-wire paths necessary to connect
compatible Programmable Key Modules (PKMs) or Digital Station Select (DSS)/Busy Lamp Field
(BLF) units. Contrary to their names, however, neither device supports serial data.
Personal Computer Data Port Module
The PCDPM can be installed on Standard, Associate, Executive, and Professional Display phones
or on 8520 or 8560 phones to gain Off-Hook Voice Announce (OVHA) receive capability or to install
an optional Modem Data Port Module (MDPM).
Modem Data Port Module
The optional Modem Data Port Module (MDPM) can be installed on Standard Display, Executive
Display, 8520, or 8560 phones for attaching a modem-equipped data device or a single line phone.
The MDPM requires a PCDPM.
The Mitel Programmable Key Module (PKM) 16 (previously called the Model 8416 Mini-DSS)
connects to Mitel 8520, 8560, or 8660 phones without PCDPM and MDPM devices. The only
programming required for the PKM 16 (Mini-DSS) is a keymap, which is explained in detail in the
MiVoice Office 250 Features and Programming Guide
.
IMPORTANT
SLAs do not support
visual
Message Waiting applications. If single line sets with
Message Waiting lamps are installed on SLAs, the lamps will not function. However,
single line sets can be configured in DB Programming to receive
audible
Message
Waiting tones.
NOTICE
Possible system degradation . For optimal system performance, do not use SLA circuits for Voice Mail
and Automated Attendant functions. Rather, the Voice Processing PC and applications software should
be used for these purposes.
NOTE
The PCDPM supports audio only when used in conjunction with the 5000 DEI product. In this
version of software, the serial port is not functional on the PCDPM, and it does not transmit
data, even though the name of the device suggests that it does.