ZyXEL Communications P-870HN-51B - V1.0 Manual page 72

Chapter 5 WAN Setup
The following table describes the fields in this screen.
Table 11 DSL PTM Interface Configuration
LABEL
ATM PVC
Configuration
VPI
VCI
Select DSL Link
Type
Encapsulation
Mode
Service Category
72
DESCRIPTION
VPI (Virtual Path Identifier) and VCI (Virtual Channel Identifier) define
a virtual circuit. This section is available only when you configure an
ATM layer-2 interface.
The valid range for the VPI is 0 to 255. Enter the VPI assigned to you.
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.
Select EoA (Ethernet over ATM) to have an Ethernet header in the
packet, so that you can have multiple services/connections over one
PVC. You can set each connection to have its own MAC address or all
connections share one MAC address but use different VLAN IDs for
different services. EoA supports ENET ENCAP (IPoE), PPPoE and
RFC1483/2684 bridging encapsulation methods.
Select PPPoA (PPP over ATM) to allow just one PPPoA connection over
a PVC.
Select IPoA (IP over ATM) to allow just one RFC 1483 routing
connection over a PVC.
Select the method of multiplexing used by your ISP from the drop-
down list. Choices are:
• VC/MUX: In VC multiplexing, each protocol is carried on a single
ATM virtual circuit (VC). To transport multiple protocols, the ZyXEL
Device 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.
• 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 EoA in the
Select DSL Link Type field.
• LLC/ENCAPSULATION: More than one protocol can be carried
over the same VC. This is available only when you select PPPoA in
the Select DSL Link Type field.
• LLC/SNAP-ROUTING: 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 EoA in the
Select DSL Link Type field.
Select UBR Without PCR or UBR With 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 Realtime VBR (real-time Variable Bit Rate) for applications
with bursty connections that require closely controlled delay and delay
variation.
Select Non Realtime VBR (non real-time Variable Bit Rate) for
connections that do not require closely controlled delay and delay
variation.
P-870HN-51b User's Guide