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Specifications
Release 3.3 11
• CO Trunk Loop - The system operates with CO Trunks up to a maximum of 1600 ohms
loop resistance.
• CO Trunk Seizure - The nominal seizure resistance is 265 ohms at 20 mA.
• CO Trunk Resistance - The on-hook dc input resistance of the LS trunks is not less than
5M ohms.
Transmission Characteristics
Compliance
The transmission characteristics for the North American and Latin American variants comply
with:
• ANSI/EIA/TIA 464-C 'Requirements for Private Branch Exchange (PBX) Switching
Equipment'.
• TIA-912 'Voice Gateway Transmission Requirements'.
The transmission characteristics for the United Kingdom variants comply with:
• ETSI ES 202 020 'Harmonized Pan-European/North American loss and level plan for voice
gateways to IP based networks'.
Mitel Networks digital telephones meet the requirements of:
• ANSI/TIA/EIA-810-A 'Transmission Requirements for Narrowband Voice over IP and Voice
over PCM Digital Wireline Telephones'.
Loss and Level Matrices
Requirements Specifications
Each country has stipulated requirements concerning acceptable transmission performance
for telephone systems. The loss plan matrices provide the correct electrical losses in decibels
(dB) for each connection to meet the specified requirement.
Loss plans have a direct effect on the acoustic levels provided at the set. Part of meeting the
requirements is to identify the reference set requirements for all standard and proprietary sets
to be used in each country. It is generally desirable to achieve the same relative loudness levels
for all standard and proprietary telephones for a specified loss plan, taking into account loop
lengths, transmission format (analog or digital), different transducers in use, line/trunk
impedances, and terminating impedances.