Chapter 5 WAN/Internet
SBG5500 Series User’s Guide
60
VCI
The valid range for the VCI is 32 to 65535 (0 to 31 is reserved for local management of ATM
traffic). Enter the VCI assigned to you.
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
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 SBG 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 e-mail.
Select
CBR
(Continuous Bit Rate) to specify fixed (always-on) bandwidth for voice or data traffic.
Select
VBR-nrt
(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.
Peak Cell Rate
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
.
Sustainable Cell
Rate
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.
This field is available only when you select
VBR-nrt
or
Realtime VBR
.
Maximum Burst
Size
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.
This field is available only when you select
VBR-nrt
or
Realtime VBR
.
IPv4 Address
This is available only when you select
IPv4 Only
or
IPv4 IPv6 Dualstack
in the
IPv4 / IPv6 Mode
field.
Obtain an IP
Address
Automatically
A static IP address is a fixed IP that your ISP gives you. A dynamic IP address is not fixed; the ISP
assigns you a different one each time you connect to the Internet. Select this if you have a
dynamic IP address.
Use the
Following IP
Address
Select this option if the ISP assigned a fixed IP address.
IP Address
Enter the static IP address provided by your ISP.
Subnet Mask Enter the subnet mask provided by your ISP.
Gateway IP
Address
Enter the gateway IP address provided by your ISP.
Routing Feature
This is available only when you select
IPv4 Only
or
IPv4 IPv6 DualStack
in the
IPv4 / IPv6 Mode
field.
Enable NAT
Select this option to activate NAT on this connection.
Enable
IGMP Proxy
Internet Group Multicast Protocol (IGMP) is a network-layer protocol used to establish
membership in a Multicast group - it is not used to carry user data.
Select this option to have the SBG act as an IGMP proxy on this connection. This allows the SBG
to get subscribing information and maintain a joined member list for each multicast group. It can
reduce multicast traffic significantly.
Apply as
Default
Gateway
Select this option to have the SBG use the WAN interface of this connection as the system
default gateway.
Table 10 WAN Internet > WAN Setup > Add/Edit: Routing Mode (continued)
LABEL
DESCRIPTION
Summary of Contents for SBG5500-A
Page 12: ...12 PART I User s Guide...
Page 44: ...44 PART II Technical Reference...
