Sitecom DC-227 - Adsl Atm

Sitecom ADSL2+ Modem DC-227
50
8.7 ADSL ATM
The page is for ATM PVC QoS parameters setting. The DSL device support 4 QoS
mode —CBR/rt-VBR/nrt-VBR/UBR.
Field Description
VPI Virtual Path Identifier. This is read-only field and is selected on the
Select column in the Current ATM VC Table.
VCI Virtual Channel Identifier. This is read-
only field and is selected on the
Select column in the Current ATM VC
Table. The VCI, together with VPI,
is used to identify the next destination of a cell as it passes through to
the ATM switch.
QoS Quality of Server, a characteristic of data transmission that measures
how accurately and how quickly a message or data is t
ransferred from a
source host to a destination host over a network. The four QoS options
are:
− UBR (Unspecified Bit Rate): When UBR is selected, the
SCR and MBS fields are disabled.
−
CBR (Constant Bit Rate): When CBR is selected, the SCR
and MBS fields are disabled.