Mitel Inter-Tel 5000, Руководство по установке и обслуживанию

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Chapter 4: Specifications
Playback Devices
Inter-Tel
®
5000 Installation Manual – Issue 2.4, May 2008
Page 4-51
However, in certain off-premises applications, the voice volume levels may still be
unacceptable. The degradation in voice volume is due to the natural voice frequency range
limitations of the telephone company or customer-provided circuit. To increase the frequency
range, Inter-Tel recommends installing a two-wire, negative impedance repeater unit. Such units
typically provide from 0–15 dB of voice volume gain and allow regulation of the gain in each
direction when simultaneous voice transmission occurs. The switching sensitivity on the unit
should also be adjustable.
The repeater unit is installed at the MDF between the endpoint block and the cabling to the OPX
endpoint. For OPX installation instructions, see “Connecting CO Trunk Cables to the MDF” on
page 5-22 .
When ordering a repeater unit, consult with the supplier for ordering the proper mounting shelf
and power supply for the unit. Typically, the product includes additional information about
operating and adjusting the repeater unit.
Playback Devices
AC-ringing playback devices may be connected to the single line port on the chassis or to IP
SLAs. Each IP SLA supports one device. A playback device is an answering machine that
answers the call, plays a message, and then disconnects from the call. Playback devices are
installed like single line endpoints, using one-pair twisted cable and four-conductor modular
jacks. The device must be able to detect ringing, provide ring trip, and automatically disconnect
when the announcement is completed. For IP SLA installation instructions, see “Installing an IP
SLA” on
page 5-175 . For installing a selected playback device, refer to the manufacturer’s
instructions.
Playback devices may be used with hunt groups to speed up call processing. Hunt groups can
have three types of special endpoints: announcement stations, overflow stations, and recall
destination stations. These types of endpoints may be equipped with a playback device that
answers the call, then disconnects to transfer it back to the hunt group. For more information,
refer to the
Inter-Tel 5000 Features and Programming Guide (part no. 580.8006).
Playback devices are programmed as regular single line endpoints that are assigned an
extension number. If the device is sensitive to Camp On tones and disconnects calls, the
programmer can disable the Camp On for that endpoint circuit. For programming details, refer
to the
Inter-Tel 5000 Features and Programming Guide (part no. 580.8006).
NOTE
Each OPX circuit can have extended ring cadence enabled or disabled. For
details, refer to the
Inter-Tel 5000 Features and Programming Guide (part no.
580.8006). The extended setting lengthens the duration of the ring signal to meet
the requirements of many OPX and/or repeater applications. The default setting is
disabled .
NOTE
For Automated Attendant features and for optimal playback device performance
and functionality, use an optional Voice Processing Unit and applications software
instead of IP SLA circuits.