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Joined: May 2003
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Is there a different pinout when terminating a t3 vs a t1?
Corwyn
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Spam Hunter
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Spam Hunter
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I've never come across a pin-out situation with T3/DS3 cabling because such circuits generally use mini-coax cables and BNC connectors.
I Love FEATURE 00
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Moderator-Vertical, Vodavi, 1A2, Outside Wire
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Moderator-Vertical, Vodavi, 1A2, Outside Wire
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Oh yes, in fact there is no pinout at all. A T3 (DS3) requires a dual run of type 734 coax cable, terminated with BNC connectors.
Ed Vaughn, MBSWWYPBX
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Just a minor addition:
A T-3 can also be run with 735 mini coax (with BNCs) for runs up to 300' or even fiber for longer distances. The old NEC Muxs (RC28D) among others used to have a fiber option.
T-1s are almost always delivered on shielded copper and the pinout for an RJ48X (the approved jack)is 1,2, (transmit) & 4,5 (receive).
A T-1 is a circuit with a bandwidth of 1.544 mbs. A T-3 is a circuit with a bandwidth of almost 45mbs and can contain 28 T-1s.
Sam
"Where are we going and why are we in this hand basket?"
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Thank you guys. IT guy at it again, telling me that T2 pinout is 12 78. I wasn't sure so I didn't argue untill I checked with the experts 
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Retired phone dude
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Moderator-1A2, Cabling
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Moderator-1A2, Cabling
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I believe a 56K pinout is 1,2,7,8. A T-2 is (was) a circuit that is no longer in use. It had a bandwidth of approximately 6 mbs (4 T-1s bonded together) it was designed for AT&T Picturphone's service. When Picturephone went south, so did the T-2.
Sam
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Yes Sam you are correct on the pinout for digital data.
Retired phone dude
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Moderator-1A2, Cabling
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Moderator-1A2, Cabling
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Bill -
How is it that I can remember things that I haven't worked in for 20 years but can't remember what I had for breakfast?
Sam
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When we provision a channelized DS3 in our Tellabs Titan 5500, we provision the T3, (7) T2s and (28) T1s. In the mux world, think of a T2 as a low-speed card.
I Love FEATURE 00
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Dex -
You're right. Many mux's contain "Low Speed" (T-2) cards or segments. It's just that no one orders a T-2 anymore. I don't think it's even an available option on any of the Carriers order forms any more. I would be surprised if anyone had seen a request for one in the last 20 years.
Sam
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I suppose ordering a T2 circuit would be like using a $2.00 bill to pay for something.
I Love FEATURE 00
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Originally posted by Silversam: Dex -
You're right. Many mux's contain "Low Speed" (T-2) cards or segments. It's just that no one orders a T-2 anymore. I don't think it's even an available option on any of the Carriers order forms any more. I would be surprised if anyone had seen a request for one in the last 20 years.
Sam In the Telco world T2 (TDM) still looks to be an “orderable option.† (I was surprised to find coding that was still valid for it... Who knew!  LOL ) I’ve NEVER seen an order for a T2 and honestly would not know of a way to even deliver it to a customer/end-user. The SONET equivalent of T2 is VT6 (virtual tributary) 6.912 Mbs would be a valid option but I'd only expect to see it being used between two carriers (IXC’s, LECs, CLECs etc) … Or as Dex mentioned for internal usage only, in order to drop down a MUX low-speed card (quad-card.)
----------------------- Bryan LEC Provisioning Engineer Cars -n- Guitars Racin' (retired racer Oct.'07)
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call me weird, but I spend two dollar bills regularly. I've found that I get better service because the money I spend is memorable. Not to mention that because I use twos that I also tip slightly more because of it which in turns leads to better service when I eat out. Everyone remembers the guy spending Tom.
Where do I get them? The commercial teller at most non-FCU banks. Though my credit union stocked them before I joined anyway.
About me: 8 years of network support 7 years IT field service
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