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- From: mmoore@hpcc01.corp.hp.com (Mike Moore)
- Date: Wed, 29 Jul 1992 04:07:16 GMT
- Subject: Re: High speed serial interface
- Message-ID: <830004@hpcc01.corp.hp.com>
- Organization: Hewlett Packard
- Path: sparky!uunet!usc!sdd.hp.com!hplabs!hplextra!hpcc05!hpcc01!mmoore
- Newsgroups: comp.dcom.sys.cisco
- References: <3202@ariadne.csi.forth.GR>
- Lines: 32
-
- / hpcc01:comp.dcom.sys.cisco / antonis@helios.ntua.gr (Antonis Kyriazis) / 12:48 am Jul 27, 1992 / writes:
-
- I'd like to ask how one can use the high speed serial interface of a router
- at a really high speed (4 or 8 Mbps)?
- I've never seen a modem playing higher than 2 Mbps (E1, G.703)...
-
- The problem is how to send, in a single stream, more than 2Mbps
- across a WAN. Money being no object, one could easily lease a T3, and
- purchase a CSU/DSU that could clock a V.35/HSSI port on a router from anywhere
- between 64kbps to 44Mbps.
-
- Unfortunately, not all of us has the resources of Ross Perot. Two other
- options exist today:
-
- 1. T1 Inverse Multiplexing
-
- This type of device (Timeplex offer such) takes multiple T1 lines,
- compensates for the different delay on each T1, and produces a single
- N*T1 bps V.35/HSSI stream of data. For example, three T1s would produce
- approx. 4.6Mbps.
-
- 2. ISDN Inverse Multiplexing
-
- ISDN multiplexers (using NFAS) are now able to make switched N*64kbps
- calls, where 64kbps B-channel increaments from multiple PRI lines are
- multiplexed together, delay compensated, and combined to make a single
- N*64kbps call. A lead change on the router's V.35 port could cause
- the call to be dialed.
-
- The "Bonding" inverse multiplexing standard is almost complete.
-
-
-