The LCP cable modem was manufactured by Lan City (which was acquired by Bay Networks, which was acquired by Nortel) and is connected to the Pentium's ethernet card by a twisted pair crossover cable. (A diagram of the network architecture can be found on the @HOME tech info page.) Note: only one computer can be connected to the cable modem; the @Home network assigns a single IP address to the account. (But we uses a proxy/gateway to get around that.)
has a good article on cable modems. See also
The host name for our PC is "c677793-a.frmt1.sfba.home.com", which is pretty ugly. So we got Infolane to provide a CNAME for us in the Fremont, California, US domain. That way inwap.fremont.ca.us is a registered alias for our IP address.
We later added a second ethernet card and the Sambar proxy server. This allows the other computers in the house to access web sites at cable modem speeds. All the other computers (and the Pentium's second NIC) are using IP addresses that are reserved for private use, such as the range from 192.168.1.1 to 192.168.1.254 as defined in RFC-1918.
The "frmt1" zone of sfba.home.com has its own DNS servers, a news server, a mail server, a web server and a caching proxy server. Cached pages come back at full speed, even when the rest of the Internet is bogged down.
The cable modem is connected to the PC with 10BASE-T twisted-pair ethernet, which limits the burst rate to 10 Mb/s. Actual sustained throughput we measured on a good day was:
Tue, 20 May 1997 at 7:19pm frame4.tar.gz 37616 Kbytes (36 megabytes, compressed) 38512284 bytes recd in 126.17 seconds (305.24 Kbytes/sec) from cable modem 38512284 bytes sent in 53.66 seconds (717.71 Kbytes/sec) over the LAN [305 Kbytes/sec = 2.44 Mbits/sec = twice the speed of a T1 link.] [717 Kbytes/sec = 5.76 Mbits/sec = limit of this Pentium's stack and NIC.] [The 'sent' test was from the Pentium to a Sun workstation over ethernet.]Another test in the middle of the night averaged 450 Kbytes/sec (3 x T1).
Installed connections in sfba.home.com as of 3-Mar-98: 3766 frmt1 Fremont 559 plstn1 Pleasanton 452 lvrmr1 Livermore 336 cstvl1 Castro Valley 251 snvl1 Sunnyvale (no new customers are being signed up) 214 ptbrg1 Pitsburg 197 ptlum1 Petaluma 119 pinol1 Pinol 5 rdc1 Regional Data CenterWe were able to take advantage of TCI's special promotional offer. Installation is usually $150, with half off if you have your own ethernet card. But because we ordered before 24-Dec-96, we got a 50% discount, so installation was only $37.50, including them running a separate wire into the den.
The monthly costs are $39.95 for @Home and $11.34 for TCI's basic service.