🚀 go-pugleaf

mmoore@hpcc01.corp.hp.com (Mike Moore) writes:
: / 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

There is a third option: SMDS. Services are now coming on-line with
DS3 access to the customer premises. SMDS access classes over DS3
support sustainable information rates (SIR) of 4, 10, 16, 25 and 34
Mbps. Both Kentrox and Digital Link (any others?) have available
DS3 SMDS DSU/CSUs with HSSI. All you need is a bridge or router with
HSSI and SMDS protocol support. And a Telco who can supply DS3 SMDS.

John Leiseboer
QPSX Communications,
Western Australia.