ZyXEL Communications P-792H User Manual page 67

Table 13 Network > WAN > Internet Access Setup: Advanced Setup (continued)
LABEL
Multicast
ATM QoS
ATM QoS Type
Peak Cell Rate
Sustain Cell
Rate
Maximum
Burst Size
PPPoE
Passthrough
(PPPoE
encapsulation
only)
MTU
MTU
Packet Filter
Incoming Filter
Sets
P-792H v2 User's Guide
DESCRIPTION
Multicast packets are sent to a group of computers on the LAN and are
an alternative to unicast packets (packets sent to one computer) and
broadcast packets (packets sent to every computer).
Internet Group Multicast Protocol (IGMP) is a network-layer protocol
used to establish membership in a multicast group. The P-792H v2
supports IGMP-v1, IGMP-v2 and IGMP-v3. Select None to disable
it.
Select CBR (Continuous Bit Rate) to specify fixed (always-on)
bandwidth for voice or data traffic. Select UBR (Unspecified Bit Rate)
for applications that are non-time sensitive, such as e-mail. Select
VBR-RT (real-time Variable Bit Rate) type for applications with bursty
connections that require closely controlled delay and delay variation.
Select VBR-nRT (non real-time Variable Bit Rate) type for
connections that do not 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.
The Sustain 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 (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 when you select PPPoE encapsulation.
In addition to the P-792H v2's built-in PPPoE client, you can enable
PPPoE pass through to allow up to ten hosts on the LAN to use PPPoE
client software on their computers to connect to the ISP via the P-
792H v2. Each host can have a separate account and a public WAN IP
address.
PPPoE pass through is an alternative to NAT for application where NAT
is not appropriate.
Disable PPPoE pass through if you do not need to allow hosts on the
LAN to use PPPoE client software on their computers to connect to the
ISP.
The Maximum Transmission Unit (MTU) defines the size of the largest
packet allowed on an interface or connection. Enter the MTU in this
field.
For ENET ENCAP, the MTU value is 1500.
For PPPoE, the MTU value is 1492.
For PPPoA and RFC 1483, the MTU is 65535.
Chapter 6 WAN Setup
67