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Specifications

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Chapter 4: Specifications
Optional Handset Amplifiers
Mitel
®
5000 Installation Manual – Issue 3.0, October 2008 Page 4-53
Figure 4-5. IP Single Line Adapter
Optional Handset Amplifiers
The typical handset amplifier is an external device that plugs into the single line endpoint where
the handset is normally connected. The handset is then plugged into the amplifier. Receiver
voice volume is controlled by turning a thumbwheel or similar control located on the amplifier.
Such amplifiers are generally equipped with a transformer that requires a 110 VAC outlet. For
installation instructions, see “Installing a Single Line Handset Amplifier” on page 5-205.
The 800-ohm loop limitation is usually suitable for accessing on-premises endpoints from off-
premises endpoints. However, for applications where one off-premises endpoint will be calling
another through the T1 span, the impedance between the two off-premises endpoints (both
circuits added together) must be less than 800 ohms (loop measurement). In this situation, a
Class A or B FIC circuit is preferable.
When an IP SLA circuit is designated for OPX use in DB Programming, its voice volume levels
are increased approximately 3 dB over normal single line endpoint voice volume levels. This
increase in volume level attempts to compensate for any loss in the external OPX circuit. Refer
to the Inter-Tel 5000 Features and Programming Guide, part no. 580.8006