ZyXEL VMG1312-B10A VMG1312-B10A-EU01V1F Ficha De Dados

Chapter 6 Broadband

VMG1312-B10A User’s Guide

Use this screen to configure your 3G settings. Click Network Setting > Broadband > 3G 
Backup.

Encapsulation 
Mode

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 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/ENCAPSULATION: More than one protocol can be carried over the same VC. This 

is available only when you select PPPoA in the Encapsulation field.

•

LLC/SNAP-ROUTING: In LCC encapsulation, an IEEE 802.2 Logical Link Control (LLC) 

header is prefixed to each routed PDU to identify the PDUs. The LCC header can be 

followed by an IEEE 802.1a SubNetwork Attachment Point (SNAP) header. This is 

available only when you select IPoA in the Encapsulation field. 

Service 
Category

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 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.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 Non Realtime VBR 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 Non Realtime VBR or Realtime VBR.

QoS

Rate Limit

Enter the rate limit for the connection. This is the maximum transmission rate allowed for 
traffic on this connection.

Apply

Click Apply to save your changes.

Cancel

Click Cancel to exit this screen without saving.

Bridge Mode (ADSL over ATM) (continued)