Chapter 6 Broadband
VMG4927-B50A / VMG9827-B50A / VMG3927-B50B User’s Guide
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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.
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
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.
VLAN This section is available only when you select ADSL/VDSL over PTM in the Type field.
Active Select Enable to enable VLAN on this WAN interface.
802.1p 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.
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.
802.1q Type the VLAN ID number (from 0 to 4094) for traffic through this connection.
OK Click OK to save your changes.
Cancel Click Cancel to exit this screen without saving.
Table 14 Network Setting > Broadband > Add New WAN Interface/Edit (ADSL over ATM-Bridge Mode)
LABEL DESCRIPTION
Table 15 VDSL Profiles
PROFILE
BANDWIDTH
(MHZ)
NUMBER OF
DOWNSTREAM
CARRIERS
CARRIER
BANDWIDTH
(KHZ)
POWER (DBM)
MAX.
DOWNSTREAM
THROUGHPUT
(MBIT/S)
8a 8.832 2048 4.3125 17.5 50
8b 8.832 2048 4.3125 20.5 50
8c 8.5 1972 4.3125 11.5 50
8d 8.832 2048 4.3125 14.5 50
12a 12 2783 4.3125 14.5 68
12b 12 2783 4.3125 14.5 68
17a 17.664 4096 4.3125 14.5 100
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