Pentagram Cerberus ADSL2+ Lite, Installation And User Manual, Page: 26 / 75

Cerberus ADSL2+ Wi-Fi (P 6331-5)
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Name – Name for this connection.
Type – Protocol used to establish this connection.
Sharing – Select type of sharing for this connection: Disabled , Enabled or VLAN .
Options – Enable or disable NAT/Firewall services for this connection.
VLAN ID – Enter VLAN identifier.
Priority Bits – Define User Priority for VLAN.
PVC Settings
PVC – Select predefined Virtual Circuit you want to use (only when Enabed or VLAN is
selected from Sharing list).
VPI – Virtual Path Identifier. The valid range for the VPI is 0 to 255.
VCI – Virtual Channel Identifier. The valid range for the VCI is 1 to 65635 (0 to 31 is reserved
for local management of ATM traffic).
QoS – Select the Quality of Service types for this Virtual Circuit. The ATM QoS types include
CBR (Constant Bit Rate), VBR (Variable Bit Rate) and UBR (Unspecified Bit Rate). These
QoS types are all controlled by the parameters specified below, including PCR, SCR, and
MBS.
CBR (Constant Bit Rate) – is for connections that support constant rates of data transfer. The
only parameter you need to worry about in CBR is PCR.
UBR (Unspecified Data Rate) – is for connections that have variable traffic. The only
parameter you need to worry about in UBR is PCR.
rtVBR (real time Variable Bit Rate) – is for connections that, while having variable traffic,
require precise timing between traffic source and destination. PCR, SCR and MBS must all be
set for rtVBR.
nrtVBR (non real time Variable Bit Rate) – is for connections that have variable traffic, do
not require precise timing, but still require a set bandwidth availability. PCR, SCR and MBS
must all be set for nrtVBR.
PCR (Peak Cell Rate) – Peak Cell Rate (PCR) is the maximum rate at which the sender can
send cells. This parameter may be lower (but not higher) than the maximum line speed. 1
ATM cell is 53 bytes (424 bits), so a maximum speed of 832 Kbps gives a maximum PCR of
1962 cells/sec. This rate is not guaranteed because it is dependent on the line speed.
SCR (Sustained Cell Rate) – Sustained Cell Rate (SCR) is the mean cell rate of a burst, on-
off traffic source that can be sent at the peak rate, and a parameter for burst-type traffic. SCR
may not be greater than the PCR; the system default is 0 cells/sec.
MBS (Maximum Burst Size) – Maximum Burst Size (MBS) is the maximum number of cells
that can be sent at the PCR. After MBS is reached, cell rates fall below SCR until cell rate
averages to the SCR again. At this time, more cells (up to the MBS) can be sent at the PCR
again.
CDVT (Cell Delay Variation Tolerance) – ATM network tolerance to cells spacing.
Auto PVC – Router will try to automatically configure PVC parameters.
Selected Type dependent settings
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PPP Settings (PPPoA/PPPoE)
Encapsulation – Select your encapsulation type.
Username – Enter your username for your PPPoE/PPPoA connection.
Password – Enter your password for your PPPoE/PPPoA connection.
Idle Timeout – When On Demand function is selected, specify how many minutes the
connection may be idle before it disconnects.
Keep Alive – Enter time between sending Keep Alive packets.
Authentication – Select authentication method for connection: Auto (recommended),
CHAP (Challenge Handshake Authentication Protocol) or PAP (Password Authentication
Protocol).
MTU – Enter TCP MTU (Maximum Transmission Unit) value here.
On Demand – Recommended for connections charged on time used.
Default Gateway – Select whether default gateway will be used or not.