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Chapter 5 Broadband
ADSL Series User’s Guide
100
5.3 Technical Reference
The following section contains additional technical information about the ZyXEL Device features
described in this chapter.
Encapsulation
Be sure to use the encapsulation method required by your ISP. The ZyXEL Device can work in
bridge mode or routing mode. When the ZyXEL Device is in routing mode, it supports the following
methods.
IP over Ethernet
IP over Ethernet (IPoE) is an alternative to PPPoE. IP packets are being delivered across an
Ethernet network, without using PPP encapsulation. They are routed between the Ethernet interface
and the WAN interface and then formatted so that they can be understood in a bridged
environment. For instance, it encapsulates routed Ethernet frames into bridged Ethernet cells.
PPP over Ethernet
Point-to-Point Protocol over Ethernet (PPPoE) provides access control and billing functionality in a
manner similar to dial-up services using PPP. PPPoE is an IETF standard (RFC 2516) specifying how
a personal computer (PC) interacts with a broadband modem (DSL, cable, wireless, etc.)
connection.
Encapsulation Mode The encapsulation method of multiplexing used by your is LLC/SNAP-BRIDGING. In
LCC encapsulation, bridged PDUs are encapsulated by identifying the type of the
bridged media in the SNAP header.
Service Category Select UBR Without PCR for applications that are non-time sensitive, such as e-mail.
Select CBR (Constant 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.
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.
Sustainable Cell
Rate
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
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.
Apply Click Apply to save your changes.
Back Click Back to return to the previous screen.
Table 14 Broadband Add/Edit: Bridge (ADSL) (continued)
Label
DESCRIPTION