Date: Tue, 26 May 1998 23:06:23 -0400 From: "Louis A. Mamakos" <louie@TransSys.COM> To: Jay <jay@oneway.com> Cc: freebsd-hardware@FreeBSD.ORG, freebsd-isp@FreeBSD.ORG Subject: Re: T1 CSU cards Message-ID: <199805270306.XAA12627@whizzo.transsys.com> In-Reply-To: Your message of "Tue, 26 May 1998 18:23:55 EDT." <Pine.BSF.3.96.980526181116.6485A-100000@tidal.oneway.com> References: <Pine.BSF.3.96.980526181116.6485A-100000@tidal.oneway.com>
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> > Good afternoon, > > I am currently working on a project that requires me to place a T1 > into a FreeBSD box. I have been through the archives and have seen > T1-serial cards without CSU.. Can anyone point me in the direction of T1 > cards with integrated CSU for FreeBSD? Does such an animal exist? Just to be clear - there are perhaps three alternative hardware bits, and you've mentioned two. What's unclear is which two :-) 1. A high-speed serial card with a V.35 or EIA-530 DTE interface. This wants to be plugged into an external CSU/DSU or null modem which supplies clock and data (both Transmit and Receive). 2. A high-speed serial card with a built-in CSU/DSU. You plug a T-1 line right into it, perhaps connected to a smart-jack. The T-1 line goes out of the building to a local central office. If lightning gets too close to this sort of wire, then you get bit errors and then it's better. Or at least the hardware doesn't burst into flame. 3. A high-speed serial card with a built-in DSU. You plug a DSX-1 level line into it. This type of connection isn't "protected", and isn't connected to an outside-plant loop. If lightning gets too close to this sort of wire, then the hardware explodes. I think you were asking about a product that does #2 as compared to a #1. I've seen some CompactPCI boards that do this (only because I've been looking at CompactPCI hardware). I believe that SDL makes boards that do #2, and there are others too. louie To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hardware" in the body of the message
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