The 3G Backup Screen - ZyXEL Communications VMG1312-B Series User Manual

Chapter 6 Broadband
Table 10 Bridge Mode ( ADSL over ATM) ( cont inued)
LABEL
Encapsulat ion
Mode
Service
Cat egory
Peak Cell Rat e
Sust ainable Cell
Rat e
Maxim um Burst
Size
QoS
Rat e Lim it
Apply
Cancel

6.3 The 3G Backup Screen

Use t his screen t o configure your 3G set t ings. Click N e t w or k Se t t in g > Br oa dba n d > 3 G
Ba ck up.
94
DESCRIPTION
Select t he m et hod of m ult iplexing used by your I SP from t he drop- down list box. Choices
are:
• LLC/ SN AP- BRI D GI N G: I n LCC encapsulat ion, bridged PDUs are encapsulat ed by
ident ifying t he t ype of t he bridged m edia in t he SNAP header. This is available only when
you select I PoE or PPPoE in t he Select DSL Link Type field.
• V C/ M UX: I n VC m ult iplexing, each prot ocol is carried on a single ATM virt ual circuit
( VC) . To t ransport m ult iple prot ocols, t he Device needs separat e VCs. There is a binding
bet ween a VC and t he t ype of t he net work prot ocol carried on t he VC. This reduces
payload overhead since t here is no need t o carry prot ocol inform at ion in each Prot ocol
Dat a Unit ( PDU) payload.
• LLC/ EN CAPSULATI ON : More t han one prot ocol can be carried over t he sam e VC. This
is available only when you select PPPoA in t he En ca psu la t ion field.
• LLC/ SN AP- ROUTI N G: I n LCC encapsulat ion, an I EEE 802.2 Logical Link Cont rol ( LLC)
header is prefixed t o each rout ed PDU t o ident ify t he PDUs. The LCC header can be
followed by an I EEE 802.1a SubNet work At t achm ent Point ( SNAP) header. This is
available only when you select I PoA in t he En ca psu la t ion field.
Select UBR W it hou t PCR or UBR W it h PCR for applicat ions t hat are non- t im e sensit ive,
such as e- m ail.
Select CBR ( Cont inuous Bit Rat e) t o specify fixed ( always- on) bandwidt h for voice or dat a
t raffic.
Select N on Re a lt im e VBR ( non real- t im e Variable Bit Rat e) for connect ions t hat do not
require closely cont rolled delay and delay variat ion.
Select Re a lt im e V BR ( real- t im e Variable Bit Rat e) for applicat ions wit h burst y connect ions
t hat require closely cont rolled delay and delay variat ion.
Divide t he DSL line rat e ( bps) by 424 ( t he size of an ATM cell) t o find t he Peak Cell Rat e
( PCR) . This is t he m axim um rat e at which t he sender can send cells. Type t he PCR here.This
field is not available when you select UBR W it h ou t PCR.
The Sust ainable Cell Rat e ( SCR) set s t he average cell rat e ( long- t erm ) t hat can be
t ransm it t ed. Type t he SCR, which m ust be less t han t he PCR. Not e t hat syst em default is 0
cells/ sec.
This field is available only when you select N on Re a lt im e VBR or Re a lt im e VBR.
Maxim um Burst Size ( MBS) refers t o t he m axim um num ber of cells t hat can be sent at t he
peak rat e. Type t he MBS, which is less t han 65535.
This field is available only when you select N on Re a lt im e VBR or Re a lt im e VBR.
Ent er t he rat e lim it for t he connect ion. This is t he m axim um t ransm ission rat e allowed for
t raffic on t his connect ion.
Click Apply t o save your changes.
Click Ca n ce l t o exit t his screen wit hout saving.
VMG1312-B Series User's Guide