Quality of Service
330
9.7
QoS configuration
BAT54-Rail/F..
Release
7.54
06/08
LANconfig
Data rate restrictions for Ethernet, DSL and DSLoL interfaces are entered in
LANconfig under configuration field 'Interfaces' on index card 'WAN' within
the settings for the different WAN interfaces:
D An Ethernet WAN (DSL/cable) interface can be switched off completely in
this dialogue.
D As upstream and downstream rate the gross data rates are entered,
which are usually a little bit higher than the net data rates indicated by the
provider as the guaranteed data rate (see also ’The queue concept’
→ page 315).
D The “external overhead” considers information added to the packets dur-
ing the data transfer. Concerning applications with small data packets
(e.g. Voice over IP), this extra overhead is quite noticeable. Examples for
the external overhead:
WEBconfig, Telnet
Under WEBconfig or Telnet the restrictions of data transfer rates for Ether-
net, DSL and DSLoL interfaces are entered at the following places:
Note: Only upstream and downstream rates are indicated by Kbps, external
overhead in bytes/packet.
Transfer External over-
head
Note
PPPoEoA 36 bytes additional headers, loss by not completely used ATM cells
PPTP 24 bytes additional headers, loss by not completely used ATM cells
IPoA (LLC) 22 bytes additional headers, loss by not completely used ATM cells
IPoA (VC-MUX) 18 bytes additional headers, loss by not completely used ATM cells
Cable modem 0 direct transfer of Ethernet packets
Configuration tool Run
WEBconfig Setup/Interfaces/DSL Interfaces
Telnet Setup/Interfaces/DSL Interfaces
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