Alesis AI-1 Reference Manual page 14

In the meantime, you may be tempted to reconnect the AI-1 to a
different ADAT when you want to route digital audio to tracks on
another machine. However, to avoid a lot of cable swapping, we
recommend swapping tapes instead. For example, let's say you have
two ADATs, the AI-1 is connected to and from ADAT #1. When you
wish to record from an S/PDIF source onto tracks 9 and 10 (ADAT
#2), the best and quickest solution is to swap tapes between the two
ADATs and record onto tracks 1 and 2. During this time, any pre-
recorded tracks may appear on different channels of your mixer
(unless you have a sophisticated patch-bay system). But this is a
minor inconvenience that lasts only until you have finished
recording from the AI-1.
It is recommended that you use the BRC Master Remote Control if
you have a multiple ADAT system, due to greater flexibility in
digital routing. However, it is possible to incorporate the AI-1 into a
multiple ADAT system without the BRC.
To connect the AI-1 to a multiple ADAT system:
1. Connect one end of a shielded dual male, 9-pin D connector to
the first ADAT's SYNC OUT jack, and connect the other end of
the cable to the SYNC IN jack of the second ADAT;
2. For each additional ADAT slave, connect one end of an
additional shielded dual male, 9-pin D connector to the second
ADAT slave's SYNC OUT jack, and the other end to the third
ADAT slave's SYNC IN jack. Its SYNC OUT jack then connects
to the fourth ADAT slave's SYNC IN jack, and so on;
3. Connect one end of a fiber optic cable to the first ADAT's
DIGITAL OUT, and connect the other end of the cable to the
DIGITAL IN of the second ADAT;
Note: If the other end of a fiber optic cable is disconnected and a
signal is being sent through the cable, you will be able to see a
red light at the output. This is an LED and not a laser light, so
you don't have to worry about damage to your eyes.
4. For each additional ADAT slave, connect one end of an
additional fiber optic cable to the second ADAT slave's DIGITAL
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