ZyXEL VMG4927-B50A User Guide - Page 81
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Chapter 6 Broadband Table 13 Network Setting > Broadband > Add New WAN Interface/Edit (ADSL over ATM-Bridge Mode) LABEL DESCRIPTION Encapsulation Select the method of multiplexing used by your ISP from the drop-down list box. Choices are: • 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 Encapsulation field. • VC/MUX: In VC multiplexing, each protocol is carried on a single ATM virtual circuit (VC). To transport multiple protocols, the VMG 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. Service Category VLAN Active 802.1p Select UBR Without PCR for applications that are non-time sensitive, such as email. 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. Select Realtime VBR (real-time Variable Bit Rate) for applications with bursty connections that require closely controlled delay and delay variation. This section is available only when you select ADSL/VDSL over PTM in the Type field. Select Enable to enable VLAN on this WAN interface. IEEE 802.1p defines up to 8 separate traffic types by inserting a tag into a MAC-layer frame that contains bits to define class of service. 802.1q OK Cancel Select the IEEE 802.1p priority level (from 0 to 7) to add to traffic through this connection. The greater the number, the higher the priority level. Type the VLAN ID number (from 0 to 4094) for traffic through this connection. Click OK to save your changes. Click Cancel to exit this screen without saving. 6.3 Advanced Settings Use the Advanced screen to enable or disable ADSL over PTM, Annex M, DSL PhyR, and SRA (Seamless Rate Adaptation) functions. The VMG supports the PhyR retransmission scheme. PhyR is a retransmission scheme designed to provide protection against noise on the DSL line. It improves voice, video and data transmission resilience by utilizing a retransmission buffer. ITU-T G.993.2 standard defines a wide range of settings for various parameters, some of which are encompassed in profiles as shown in the next table. Table 14 VDSL Profiles PROFILE BANDWIDTH (MHZ) 8a 8.832 8b 8.832 8c 8.5 8d 8.832 12a 12 12b 12 17a 17.664 NUMBER OF DOWNSTREAM CARRIERS CARRIER BANDWIDTH (KHZ) 2048 2048 1972 2048 2783 2783 4096 4.3125 4.3125 4.3125 4.3125 4.3125 4.3125 4.3125 POWER (DBM) 17.5 20.5 11.5 14.5 14.5 14.5 14.5 MAX. DOWNSTREAM THROUGHPUT (MBIT/S) 50 50 50 50 68 68 100 VMG4927-B50A / VMG9827-B50A User's Guide 81