ZyXEL SBG3300-NB00 User Guide - Page 127

Chapter 6 Broadband Table 8 Routing Mode (continued) LABEL Encapsulation Mode DESCRIPTION Select the method of multiplexing used by your ISP from the drop-down list box. Choices are: Service Category • LLC/SNAP-BRIDGING: In LCC encapsulation, bridged PDUs are encapsulated by identifying the type of the bridged media in the SNAP header. This is available only when you select IPoE or PPPoE in the Select DSL Link Type field. • VC/MUX: In VC multiplexing, each protocol is carried on a single ATM virtual circuit (VC). To transport multiple protocols, the Device needs separate VCs. There is a binding between a VC and the type of the network protocol carried on the VC. This reduces payload overhead since there is no need to carry protocol information in each Protocol Data Unit (PDU) payload. • LLC/ENCAPSULATION: More than one protocol can be carried over the same VC. This is available only when you select PPPoA in the Encapsulation field. • LLC/SNAP-ROUTING: In LCC encapsulation, an IEEE 802.2 Logical Link Control (LLC) header is prefixed to each routed PDU to identify the PDUs. The LCC header can be followed by an IEEE 802.1a SubNetwork Attachment Point (SNAP) header. This is available only when you select IPoA in the Encapsulation field. Select UBR Without PCR or UBR With PCR for applications that are non-time sensitive, such as e-mail. Select CBR (Continuous Bit Rate) to specify fixed (always-on) bandwidth for voice or data traffic. Select Non Realtime VBR (non real-time Variable Bit Rate) for connections that do not require closely controlled delay and delay variation. Peak Cell Rate Sustainable Cell Rate Select Realtime VBR (real-time Variable Bit Rate) for applications with bursty connections that require closely controlled delay and delay variation. Divide the DSL line rate (bps) by 424 (the size of an ATM cell) to find the Peak Cell Rate (PCR). This is the maximum rate at which the sender can send cells. Type the PCR here.This field is not available when you select UBR Without PCR. The Sustainable Cell Rate (SCR) sets the average cell rate (long-term) that can be transmitted. Type the SCR, which must be less than the PCR. Note that system default is 0 cells/sec. Maximum Burst Size This field is available only when you select Non Realtime VBR or Realtime VBR. Maximum Burst Size (MBS) refers to the maximum number of cells that can be sent at the peak rate. Type the MBS, which is less than 65535. PPP Information PPP User Name PPP Password PPP Auto Connect IDLE Timeout This field is available only when you select Non Realtime VBR or Realtime VBR. This is available only when you select PPPoE or PPPoA in the Mode field. Enter the user name exactly as your ISP assigned. If assigned a name in the form user@domain where domain identifies a service name, then enter both components exactly as given. Enter the password associated with the user name above. Select this option if you do not want the connection to time out. This value specifies the time in minutes that elapses before the router automatically disconnects from the PPPoE server. PPPoE Service Name This field is not configurable if you select PPP Auto Connect. Enter the name of your PPPoE service here. SBG3300-N Series User's Guide 127