Pro Tools | MTRX Installation Guide18
Digital I/O Connections
MTRX Dual MADI I/O Expansion Card
The MTRX Dual MADI I/O expansion card can be installed with one or two “Small form-factor plugga-
ble” (SFP) transceiver modules. The SFP modules are standard types which support various types of opti-
cal interfaces with LED or Laser diodes, various wavelengths and fiber types. Each SFP module has a re-
ceiver and a transmitter port, and can be used for MADI audio I/O. The right port of the SFP connector is
the receiver and the left port is the transmitter.
AES11 Sync Input, Female XLR Connector
Pin 1
TX. +
Pin 2
TX. –
Pin 3
RX. +
Use only Avid-qualified SFPs (contact your Avid reseller). SFPs from other third party vendors may not
work with Pro Tools | MTRX and are not recommended.
Optical wavelengths of 850nm and 1300nm are commonly used for multi-mode MADI cards. 1300nm
uses 100BASE-FX cable and allows for cable runs as far as 6,600 feet. 850nm is a lower cost alternative
that uses 100BASE-SX cable, due to the use of short wavelength optics (which are significantly less ex-
pensive than the long wavelength options used in 100BASE-FX), with maximum cable runs up to ap-
proximately 1,000 feet.
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