3Com 3CRWDR101B-75, 3CRWDR101A-75 manual Configuring the Router

56CHAPTER 5: CONFIGURING THE ROUTER

■Manual - Start in Last State means that after re-booting the Router, the Internet connection will stay in the previous condition before the reboot.

5If you want your Router to automatically disconnect from the Internet after a period of inactivity, specify a time in the Idle Time (Minutes) field. (Enter a value of 0 to disable this timeout).

6Enter the Maximum Transmission Unit (MTU) value supplied by your ISP. If you do not know this, leave it at the default value.

7The Router supports the IP Control Protocol (IPCP) Subnet Mask Support feature, check the IPCP subnet checkbox to enable it.

8To use the IPCP Subnet Mask Support for the DHCP clients, check the IPCP Subnet Populate DHCP Server checkbox.

9Enter the VPI and VCI values provided by your ISP in the VPI and VCI fields. You can click Auto Search to automatically find out this information.

10Select the encapsulation type (LLC or VC MUX) in the Encapsulation field. This information should be provided to you by your ISP.

11Select the type of Quality of Service (CBR, UBR or VBR) in the QoS field.

■CBR (constant bit rate): the CBR service class is intended for real-time applications, for example, those requiring tightly constrained delay and delay variation, such as voice and video applications. The consistent availability of a fixed quantity of bandwidth is considered appropriate for CBR service.

■VBR (variable bit rate): QoS class defined by the ATM Forum for ATM networks. VBR is subdivided into a real time (RT) class and non-real time (NRT) class. VBR (RT) is used for connections in which there is a fixed timing relationship between samples. VBR (NRT) is used for connections in which there is no fixed timing relationship between samples, but that still need a guaranteed QoS. Compare with ABR, CBR, and UBR.

■UBR (unspecified bit rate): the UBR service class is intended for delay-tolerant or non-real-time applications, for example, those which do not require tightly constrained delay and delay variation, such as traditional computer communications applications. The UBR service may be considered as "best effort service".

12Enter the PCR/SCR/MBS values. This information should be provided to you by your ISP.