my profile | my password | search | faq & rules | forum home

» Film-Tech Forum ARCHIVE   » Operations   » Film Handlers' Forum   » How exact does the SR-D cable need to be?

Author Topic: How exact does the SR-D cable need to be? John Walsh Film God Posts: 2490 From: Connecticut, USA, Earth, Milky Way Registered: Oct 1999 posted 09-13-2000 10:55 AM                     You know that multiple-shielded cable that goes from the Dolby digital soundhead to the SR-D box in the rack... How exact does the length have to be? Could I get away with increasing it by about 1.5 inches? I want to cut it, and splice in a DB25 connector. The crimp terminals will add about 1.5 inches to the overall length.  |  IP: Logged Aaron Sisemore Flaming Ribs beat Reeses Peanut Butter Cups any day! Posts: 3061 From: Rockwall TX USA Registered: Sep 1999 posted 09-13-2000 12:47 PM                     It should work fine, provided that no wires get crossed. I have cut the SRD cables shorter for some installations with no problems, and I know that custom (usually longer than the stock cable) lengths are available from Dolby, so you should be fine... Just make sure that the DB25 connectors lock in in some way so that they can't accidentally disconnect while in operation, as I don't believe its good to run the reader or DA20 with the cable disconnected... Aaron  |  IP: Logged Scott Norwood Film God Posts: 8146 From: Boston, MA. USA (1774.21 miles northeast of Dallas) Registered: Jun 99 posted 09-13-2000 01:32 PM                        Wouldn't it be easier just to buy or make a straight-through cable with a DB-25 mail end on one end and a female end on the other?  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 09-13-2000 03:02 PM                     I have run the SR*D cable as long as 100' (some electrician that I'm sure is real proud of himself ran the conduit by way of China!). No problems and low error rates. There is a physical limit though when the signal will drop of too much but you are talking about inches. I would prefer to keep the cable as splice free as possible though. Steve ------------------ "Old projectionists never die, they just changeover!"  |  IP: Logged Brad Miller Administrator Posts: 17775 From: Plano, TX (36.2 miles NW of Rockwall) Registered: May 99 posted 09-13-2000 03:26 PM                     Don't cut it. Just put an extension on. I've ran them 55 feet with no problems, but as Steve pointed out before me even 100 feet will work fine.  |  IP: Logged Scott Norwood Film God Posts: 8146 From: Boston, MA. USA (1774.21 miles northeast of Dallas) Registered: Jun 99 posted 09-13-2000 04:42 PM                        FYI: I have no idea how closely Dolby follows the standards for serial communications in computer equipment, but the RS-232 spec defines a length limit of 75 feet at 9600 bps. That's probably a pretty conservative estimate...I've run many serial lines (mostly console cables for Sun servers) for well over 100 feet with no problems...  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 09-13-2000 06:51 PM                     It isnot serrial but is video data If you splice it with a extension I would recomend a shielded connector  |  IP: Logged John Walsh Film God Posts: 2490 From: Connecticut, USA, Earth, Milky Way Registered: Oct 1999 posted 09-13-2000 09:02 PM                     Yeah, I just want to cut the existing cable, and splice in a DB25 male/female. I have a nice shielded AMP connector picked out, and hand-operated spring-loaded clips to hold it in. It's for a "roll-around" DD rack idea we're playing with. You know where the cable comes out of a CAT. 700? Well, we are also thinking of making a replacement panel that has the same mounting screws holes, but has a DB25 connector (instead of the KO hole.)  |  IP: Logged

All times are Central (GMT -6:00)

Printer-friendly view of this topic

Hop To: Select a Forum: Category: Operations -------------------- Digital Cinema Forum Film Handlers' Forum Large Format Forum Ground Level Feature Info, Trailer Attachments & REAL Credit Offsets Category: Community -------------------- Film-Yak Film Handlers' Movie Reviews The Afterlife Bob Maar's Joke-A-Thon Category: Classified -------------------- Equipment and Supplies Wanted/For Sale Help Wanted/Seeking Employment Category: System -------------------- Software Beta Testing Forum

The Film-Tech Forums are designed for various members related to the cinema industry to express their opinions, viewpoints and testimonials on various products, services and events based upon speculation, personal knowledge and factual information through use, therefore all views represented here allow no liability upon the publishers of this web site and the owners of said views assume no liability for any ill will resulting from these postings. The posts made here are for educational as well as entertainment purposes and as such anyone viewing this portion of the website must accept these views as statements of the author of that opinion and agrees to release the authors from any and all liability.