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P2302R-P1C Support Notes
All contents Copyright 2007 ZyXEL Communications Corporation.
107
How does the ZyXEL Device support TFTP?
In addition to the direct console port connection, the ZyXEL Device supports the uploading/download of the
firmware and configuration file using TFTP (Trivial File Transfer Protocol) over LAN.
Can the ZyXEL Device support TFTP over WAN?
Although TFTP should work over WAN as well, it is not recommended because of the potential data corruption
problems.
How can I upload data to outside Internet over the one-way cable?
A workaround is to use an alternate path for your upstream path, such as a dialup connection to an Internet
service provider. So, if you can find another way to get your upstream packets to the Internet you will still be
able to receive downstream packets via the ZyXEL Device.
How fast can the data go?
The speed of the cable modem is only one part of the equation. There are a combination of factors starting with
how fast your PC can handle IP traffic, then how fast your PC to cable modem interface is, then how fast the
cable modem system runs and how much congestion there is on the cable network, then how big a pipe there is
at the head end to the rest of the Internet.
Different models of PCs and Macs are able to handle IP traffic at varying speeds. Very few can handle it at 30
Mbps.
Ethernet (10baseT) is the most popular cable modem interface standard for the PC. This automatically limits the
speed of the connection to under 10 Mbps even if the cable modem can receive at 30 Mbps. Most Local Area
Networks use 10baseT Ethernet, and although they are 10 Mbps networks, it takes a LOT longer than one
second to transmit 10 megabits (or 1.25 megabytes) of data from one terminal to another.
Cable modems on the same node share bandwidth, which means that congestion is created when too many
people are on simultaneously. One user downloading large graphic or video files can use a significant portion of
shared bandwidth, slowing down access for other users in the same neighborhood.
Most independent Internet Service Providers today connect to the Internet using a single 1.5 Mbps "T1"
telephone line. All of their subscribers share that 1.5 Mbps pipeline. Cable head-ends connecting to the Internet
backbone using a T1 limit their subscribers to an absolute maximum of 1.5 Mbps.