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Page 31 / 131 Scroll up to view Page 26 - 30
User Manual for T2-B-Gawv1.4U10Y.BI
Teracom Limited
28
An ISO Certificed Company
The following table describes the parameters of this page.
Field
Description
VPI
Virtual path identifier (VPI) is the virtual path
between two points in an ATM network. Its
valid value is from 0 to 255.
VCI
Virtual Channel Identifier (VCI) is the virtual
channel between two points in an ATM
network. Its valid value is from 32 to 65535.
Service Category
You can choose
UBR With PCR
,
CBR
,
Non
Realtime VBR
, or
Realtime VBR
.
°
UBR with PCR
:
Unspecified bite rate
with peak cell rate (UBR with PCR).
When the network is congested, the UBR
cell is dropped and communication traffic
is at a fairly low level. Its peak cell rate
range is from 0 to 8000.
°
CBR
: Constant bit rate (CBR) is a coding
mode. It is adapted for strict requirement
to delay and quality of data packets
transmission. Its peak cell rate range is
from 0 to 7100.
Page 32 / 131
User Manual for T2-B-Gawv1.4U10Y.BI
Teracom Limited
29
An ISO Certificed Company
Field
Description
°
Non Real-time VBR
: Non real-time
variable bit rate (NRT-VBR) is adapted
for
real
time
with
relatively
low
requirement.
Its peak cell rate range is
from 0 to 8000. The sustainable cell rate
range is from 1 to 7099, and the
maximum burst size range is from 0 to
1000000.
°
Real-time VBR
: Real-time variable bit
rate (Real-time VBR) is adapted for real
time with high requirement. Its peak cell
rate range is from 0 to 8000. The
sustainable cell rate range is from 1 to
7099, and the maximum burst size range
is from 0 to 1000000.
Sustainable Cell Rate
Sustainable cell rate (SCR) is an ATM
parameter
for
traffic
management.
For
variable bit rate (VBR) connections, SCR
determines the long-term average cell rate
that can be transmitted.
Maximum Burst Size
Maximum burst size (MBS) is used to specify
the maximum number of cells that can be
transmitted at the contracted peak cell rate
(PCR).
Note:
The value of PCR should be greater than SCR, and MBS is usually less than 10.
The
service category
merely is effective to upstream.
Step 3
After proper modifications, click
Next
and the following page appears. In
the page, you can modify the configure connection type, such as
encapsulation type or encapsulation mode (The mode is only adapted
for RFC2684 protocol).
Page 33 / 131
User Manual for T2-B-Gawv1.4U10Y.BI
Teracom Limited
30
An ISO Certificed Company
: Add Internet connection.
The following describes an example of adding PVC 0/32.
Step 1
In the following page, click
Add
to add PVC 0/32.
Step 2
The following page appears. In this page, you can modify VPI, VCI, and
service categories.
Page 34 / 131
User Manual for T2-B-Gawv1.4U10Y.BI
Teracom Limited
31
An ISO Certificed Company
The following table describes the parameters of this page.
Field
Description
VPI
Virtual path identifier (VPI) is the virtual path
between two points in an ATM network. Its
valid value is from 0 to 255.
VCI
Virtual Channel Identifier (VCI) is the virtual
channel between two points in an ATM
network. Its valid value is from 32 to 65535.
Service Category
You can choose
UBR With PCR
,
CBR
,
Non
Realtime VBR
, or
Realtime VBR
.
°
UBR with PCR
:
Unspecified bite rate
with peak cell rate (UBR with PCR).
When the network is congested, the UBR
cell is dropped and communication traffic
is at a fairly low level. Its peak cell rate
range is from 0 to 8000.
°
CBR
: Constant bit rate (CBR) is a coding
mode. It is adapted for strict requirement
to delay and quality of data packets
transmission. Its peak cell rate range is
from 0 to 7100.
Page 35 / 131
User Manual for T2-B-Gawv1.4U10Y.BI
Teracom Limited
32
An ISO Certificed Company
Field
Description
°
Non Real-time VBR
: Non real-time
variable bit rate (NRT-VBR) is adapted
for
real
time
with
relatively
low
requirement.
Its peak cell rate range is
from 0 to 8000. The sustainable cell rate
range is from 1 to 7099, and the
maximum burst size range is from 0 to
1000000.
°
Real-time VBR
: Real-time variable bit
rate (Real-time VBR) is adapted for real
time with high requirement. Its peak cell
rate range is from 0 to 8000. The
sustainable cell rate range is from 1 to
7099, and the maximum burst size range
is from 0 to 1000000.
Sustainable Cell Rate
Sustainable cell rate (SCR) is an ATM
parameter
for
traffic
management.
For
variable bit rate (VBR) connections, SCR
determines the long-term average cell rate
that can be transmitted.
Maximum Burst Size
Maximum burst size (MBS) is used to specify
the maximum number of cells that can be
transmitted at the contracted peak cell rate
(PCR).
Note:
The value of PCR should be greater than SCR, and MBS is usually less than 10.
The
service category
merely is effective to upstream.
Step 3
After proper modifications, click
Next
and the following page appears. In
this
page,
you
can
modify
Internet
connection
protocol
and
encapsulation type.

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