ZyXEL Communications P-861H-G1, Руководство пользователя, Страница: 81 / 341

Prestige 861H Series User’s Guide
Chapter 5 WAN Setup 80
Encapsulation Select the method of encapsulation used by your ISP from the drop-down list
box. Choices vary depending on the mode you select in the Mode field.
If you select Bridge in the Mode field, select either PPPoA or RFC 1483 .
If you select Routing in the Mode field, select PPPoA , RFC 1483 , ENET
ENCAP or PPPoE .
Multiplex This field displays the method of multiplexing used by your ISP.
Virtual Circuit ID VPI (Virtual Path Identifier) and VCI (Virtual Channel Identifier) define a virtual
circuit. Refer to the appendix for more information.
VPI The valid range for the VPI is 0 to 255. Enter the VPI assigned to you.
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.
ATM QoS Type Select CBR (Contstant 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) or VBR-nRT (non Real Time
Variable Bit Rate) for bursty traffic and bandwidth sharing with other applications.
Cell Rate Cell rate configuration often helps eliminate traffic congestion that slows
transmission of real time data such as audio and video connections.
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.
Cell Delly Variation
Tolerance
This field displays the accepted tolerance of the difference between a cell’s
transfer delay and the expected transfer delay.
Sustain 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 100.
Application Select an application that you want to apply to this remote node from the drop-
down list box. The application types are: Middleware , Video , IGMP , Data , VoIP
and Home Gateway .
The defaults available will depend on which services you subscribe to. For
example, you can subscribe to request video services in which case you can use
Middleware , Video and IGMP for remote node applications.
Select Middleware to have the remote node connect to a device through another
intermediary device, for example, to connect to a set-top box.
Select
Video to have the remote node connect to downstream video
applications, for example, IP Video on Demand.
Select
IGMP (Internet Group Multicast Protocol) to have the Prestige establish
membership in a multicast group; it is not used to carry user data.
Select
Data if you only have an Internet access subscription from your ISP and
no other services.
Select
VoIP to have the remote node use real-time applications such as Voice-
over-IP.
Select
Home Gateway to have the remote node use network devices located in
your home, for example, security surveillance, remote meter reading and home
appliances (such as fridges or air-conditioners).
Table 14 WAN Setup (continued)
LABEL DESCRIPTION