Logitek Electronic Systems JetStream Audio Networking Platform - Manual (Page 18)

GPI Inputs & Outputs
The JetStream MINI provides 12 logic input connections along with 16 relay closures for external
device control. Three GPI inputs and four GPI outputs are on each of four DB-15 connectors.
 TIP: The 4 GPIO connectors on the back panel plug into a circuit card with electronic
relays on it inside of the JetStream. It is possible to pull the back of the frame away
so the card with the relays does not make good contact with the card with the
connectors if the JetStream is mounted in a rack without its top lid. We recommed
that the lid always be fastened with all screws tightened down.

See Appendix C for connector pinouts.
External Sync
The JetStream MINI may be synchronized to an external sample clock, which is connected to the
Ext Sync port. The external clock is an alternative to the internally set sample rate. For example, this
would be used if all devices in a facility were to be tied to the same sample-rate and clock.
The JetStream MINI will accept any AES source and lock to it. The green PC light will turn on when
external sync is present.
The JetStream MINI automatically matches any sample rate of digital inputs from approximately 25
KHz to over 50 KHz. The outputs can be set to sample rates of 32 KHz, 44.1 KHz, and 48 KHz or
locked to an external clock source (at one of these frequencies).
When integrating a JetStream MINI with an AoIP system made by another manufacturer, you
should connect an AES output from the other system to the External Sync input to rate lock the two
systems together.

See Appendix C for connector pinouts.
Synchronizing JetStreams (Master/Slave)
By default, a JetStream is independent and will run on its own sample rate clock or external sync
input as described above. In a networked environment, JetStreams can lock to each other across the
network.
One JetStream can be set as Master by turning on device 26 bus 14. The red DSP LED on the rear
and/or front of the unit will turn on to indicate that the JetStream is the master.
To set a JetStream as a slave, turn on device 26 bus 15. The green PC light will turn on to indicate
that the JetStream is a slave.
Logitek JetStream MINI Reference Manual 18