User manual ART SYNCGEN

[. . . ] Environment: Protect from excessive dirt, dust, heat, and vibration when operating and storing. Avoid tobacco ash, drink spillage and smoke, especially that associated with smoke machines. To avoid injury to yourself or damage to the equipment, take care when lifting, moving, or carrying the unit. Servicing: Unplug power immediately if equipment is exposed to moisture, the power supply becomes damaged during a lightning storm or if smoke odor or noise is noted. [. . . ] Add a 75 Ohm terminator at the end of the cable run, either on the second wordclock input (Wordclock Thru) if available, or by adding a BNC "T" adaptor. A BNC "T" has two female ends (for cables) and one male end (to connect to a jack). You can buy these at RadioShack model #278-112. 3 If the Termination LED is RED, then there is an output-loading problem, and the output may be too low to function. (A defective or improperly connected cable could cause this. ) If an output is unterminated or unused, the LED will not light. The SyncGen uses discrete 75 Ohm output drivers that adapt to the output load. Each output is protected from shorts and over-voltage due to accidental incorrect termination. Termination and why it is needed A terminator is simply a resistor connected between the signal and ground at the end of a cable. These reflections can skew the timing of the waveform leading to timing errors. The longer the cable run, the worse the errors are that can be created. A green termination LED will indicate that a SyncGen output is correctly terminated. If you have too many terminators or a cable short, the LED will light red. This typically happens when you have a device with internal termination and you add a 75 Ohm terminator to the cable as well. An easy way to check for internal termination is to connect to the digital audio unit that you are unsure of, and check the termination LED. First connect a cable; the termination LEDS should remain unlit indicating no short circuit. The termination LED should light green indicating a good connection. S/PDIF outputs Two coaxial S/PDIF outputs are provided to allow synchronization of digital audio devices that lack BNC wordclock inputs. Devices like the Digidesign Digi 002 have coax S/PDIF inputs that can be selected as the source for timing reference. Use this input with the ART SyncGen to tie the timing of this device in with the rest of your system. The SyncGen's S/PDIF output has all audio bits set to zero "digital black", providing a locking source for these applications. 4 Diagram 1. 5 Connecting more than one device to an output More than one digital audio unit can be connected to a single wordclock output by daisy chaining the audio units together using either their Wordclock Thru jacks or by the use of BNC "T" adaptors. ART products with Wordclock Thru jacks are NOT terminated internally, thereby allowing easy connection of more than one device to a single SyncGen wordclock output. A 75 Ohm terminator will be required on the last unit in the chain (furthest from the SyncGen). NOTE: If you have a digital audio device with internal termination, it should ALWAYS be placed at the end of the cable run. You should not use a BNC "T" Adaptor on a unit with internal termination as this effectively places a termination at that point in the line. Cable length The delay through a high quality cable is a little over one nanosecond (1 x 10-9 sec. ) per foot. [. . . ] You may contact Customer Service for more assistance, or directly request a Return Authorization for service in the "resources" area of the website. 3) If you are returning the unit for service, pack the unit in its original carton or a reasonable substitute. The original packaging may not be suitable as a shipping carton, so consider putting the packaged unit in another box for shipping. 4) Include, with your unit, a note with the RA number and your contact information including a daytime phone number, preferably attached to the top of the unit. 7 Notes: 8 Specifications: Wordclock Outputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ]