🚀 go-pugleaf

/ 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.