Planet GRT-101 User Manual page 35

G.SHDSL Bridge/Router
GRT-101/401/402 User's Manual
Protocol: If WAN Protocol is PPPoA or PPPoE with dynamic IP, leave the default WAN IP
Address and Subnet Mask as default setting. The system will ingore the IP Address and
Subnet Mask information, but leaving erasion or blanks in default setting will cause system
error.
If the WAN Protocol is IPoA or EoA, leave the ISP parameters as default setting. The system
will ingore the information, but leavingerasion or blanks in default setting will cause system
error.
VC-mux (VC-based Multiplexing): Each protocol is assigned to a specific virtual circuit.
VC-based multiplexing may be dominant in environments where dynamic creation of large
numbers of ATM VCs is fast and economical.
LLC (LLC-based Multiplexing): One VC carries multiptle protocols with protocol identifying
information being contained in each packet header. Desapite the extra bandwidth and
processing overhead, this method may be advantagrous if it is not practical to have a sepatate
VC for each carried protocol.
VPI (Virtual Path Identifier): is for set up ATM Permanent Virtual Channels (PVC).The valid
range for VPI is 0 to 255.
VCI (Virtual Channel Identifier is for set up ATM Permanent Virtual Channels (PVC): The
valid range for VCI is 32 to 65535 (0 to 31 is reserved for local management of ATM traffic.)
QoS (Quality of Service) class : The Traffic Management Specification V4.0 defines ATM
service cataloges that describe both the traffic transmitted by users onto a network as well as
the Quailty of Service that the network needs to provide for that traffic. There are four classes
to be selected: UBR, CBR, rt-VBR and nrt-VBR. Select CBR to specify fixed bandwidth for
voice or data traffic. Select UBR for applications that are not time-sensitive such as e-mail.
Select VBR for bursty traffic and bandwidth sharing with other applications.
UBR (Unspecified Bit Rate): is the simplest service provided by ATM networks. There is no
guarantee of anything. It is a primary service used for transferring Internet traffic over the ATM
network.
CBR (Constant Bit Rate): is used by connections that require a static amount of bandwidth
that is available during the connection life time. This bandwidth is characterized by Peak Cell
Rate (PCR). Based on the PCR of the CBR traffic, specific cell slots are assigned for the VC in
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