ISP Information:
This implies that two clock cycles are needed to address a column of a memory chip. CAS 2 SDRAM memory is preferable to CAS 3 SDRAM memory, but is often more expensive. DDR memory has CAS 2 and CAS 2.5 for comparison. You can sometimes set the CAS latency of your memory in your computer BIOS.
ISP Glossary:
CAS 2 - We currently have a PRI system in place over a copper T-1 line and we have a 256K SDSL line for Internet access. As I understand it, the PRI allows us 23 B channels (plus one D channel) to use for our voice communications.Right. Another company proposes taking us over to a T-1 with 12 business lines plus 4 channels dedicated to our Internet access. It seems to me that we'll be losing several lines in the transition, which could hurt us when we hit our busy season in a few months.Equally right. You also lose some of the extra signalling featuresthat ISDN provides. My little brain tells me that in either case, there are a total of 23B+1D channels available (since they're both T-1 based),Not quite. A plain channelized T1 doesn't have B and D channels, it justhas channels, so there's a total of 24, which you can statically allocateto voice or data by flipping switches (or typing commands) on your CSUor channel bank. On the other hand, the straight T-1 approach would limit us to 12 channels, with enough room to expand to 19 B channels (the last 4 being reserved for our Internet connection).Unless you're going to save a whole lot of money, I wouldn't bother.If you want Internet data via your T1, it should be possible to "bond"four of the B channels for 256K of data and use that for your Internetfeed, leaving the rest for voice and keeping the superior ISDNinterface. Assuming you're paying for usage, there's little reasonnot to make all of the channels available.John R. Levine, IECC, POB 727, Trumansburg NY 14886 +1 607 330 5711johnl@iecc.com Village Trustee and Sewer Commissioner http://iecc.com/johnlMember, Provisional board, Coalition Against Unsolicited Commercial E-mail
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