FREQUENTLY ASKED QUESTIONS MITEL 2
MITEL 8528 / 8568 TELEPHONES
• The 8528 and 8568 Telephones support the Mitel Programmable Key Module
(PKM) 12 and Mitel Programmable Key Module (PKM) 48. They do not support the
Mitel Programmable Key Module (PKM) 50 unit (also known as Model 8416
Mini-DSS) or the Mitel Programmable Key Module (PKM) 16 unit (also known
as Model 8450-50 key DSS).
• The 8528 and 8568 Telephones do not support the Personal Computer Data Port Module
(PCDPM) or the Modem Data Port Module (MDPM).
• The 8528 and 8568 Telephones do not support the Off-Hook Voice
Announce (OHVA) feature.
• The 8520 and 8560 Telephones had NA and UK variants, each with individual A-law and
mu-law codecs. The new 8528 and 8568 Telephones contain universal codecs for global
use. The only difference in the NA and UK variants is in the packaging of the line cords.
• The new 8528 and 8568 Telephones use standard wiring when connecting to
RJ jacks. The older 8520 and 8560 Telephones used non-standard wiring.
Q. What are the wiring differences between the older 8520 / 8560 Telephones and the
new 8528 / 8568 Telephones, and why is it important for installers to note this?
A. There has been a change in the wiring for the 8528 / 8568 Telephones as compared to the
existing 8520 / 8560 Telephones. The 8520 / 8560 Telephones used non-standard wiring,
but the new 8528 / 8568 Telephones use standard wiring.
When installers look at the “RJ”, the new 8528 / 8568 Telephones use the inside pair of
wires (the two middle wires). The older 8520 / 8560 Telephones used the next pair out
from the middle. Typically, the secondary Tip / Ring pair was used by the older 8520 / 8560
Telephones and this was pins 2 and 5. The primary Tip / Ring pair is used by the
8528 / 8568 Telephones, and these are typically referred to as pins 3 and 4.
This wiring change is relevant if an installer tries to try to replace an older 8520 or
8560 Telephone with a new 8528 or 8568 Telephone. Installers will likely need to
rewire the jack.
In addition, the older phones 8520 / 8560 Telephones were polarity sensitive and Tip and
Ring had to be matched appropriately. The new 528 / 8568 Telephones are agnostic to
which is Tip and which is Ring, as long as they are wired to the center pair of contacts
on the RJ.
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