Справочник Пользователя для ZyXEL P-2302R-P1
P2302R-P1 Support Notes
All contents Copyright
2007 ZyXEL Communications Corporation.
108
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
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.
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.
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.
backbone using a T1 limit their subscribers to an absolute maximum of 1.5 Mbps.
To create the appearance of faster network access, service companies plan to store or "cache" frequently
requested web sites and Usenet newsgroups on a server at their head-end. Storing data locally will remove some
of the bottleneck at the backbone connection.
of the bottleneck at the backbone connection.
How fast can they go? In a perfect world (or lab) they can receive data at speeds up to 30 Mbps. In the real
world, with cost conscious cable companies running the systems, the speed will probably fall to about 1.5
Mbps.
Mbps.
My ZyXEL Device can not get an IP address from the ISP to connect to the Internet, what
can I do?
Currently, there are various ways that ISPs control their users. That is, the WAN IP is provided only when the
user is checked as an authorized user. The ISPs currently use three ways:
user is checked as an authorized user. The ISPs currently use three ways:
1. Check if the 'MAC address' is valid
2. Check if the 'Host Name' is valid, e.g., @home
3. Check if the 'User ID' is valid, e.g., RR-Toshiba Authentication Service, RR-Manager Authentication
2. Check if the 'Host Name' is valid, e.g., @home
3. Check if the 'User ID' is valid, e.g., RR-Toshiba Authentication Service, RR-Manager Authentication
Service
If you are not able to get the Internet IP from the ISP, check which authentication method your ISP uses and
troubleshoot the problem as described below.
troubleshoot the problem as described below.
1. Your ISP checks the 'MAC address'
Some ISPs only provide an IP address to the user with an authorized MAC address. This authorized MAC can
be the PC's MAC which is used by the ISP for the authentication. So, if a new network card is used or the
be the PC's MAC which is used by the ISP for the authentication. So, if a new network card is used or the