Справочник Пользователя для Insys GPRS 5.0 Ethernet 11-02-01-03-10.018
Модели
11-02-01-03-10.018
INSYS GPRS 5.0 Ethernet
GPRS General
Dez-06
55
1 TS
2 TS
3 TS
4 TS
CS1
8
16
24
32
CS2
12
24
36
48
CS3
14.4 28.8 43.2
57,6
CS4
20
40
60
80
Data rates of PC data only (without GPRS control data)
Note
The above mentioned values represent the theoretically maximum
possible values.
The above mentioned values represent the theoretically maximum
possible values.
In practice, the following applies:
GPRS will not provide guaranteed data rates or bandwidths for the application.
The values allocated by the network provider (coding scheme and time slots to be
used) can change dynamically during a connection and, among other things, de-
pend on the current amount of connections in the GSM cell.
GPRS will not provide guaranteed data rates or bandwidths for the application.
The values allocated by the network provider (coding scheme and time slots to be
used) can change dynamically during a connection and, among other things, de-
pend on the current amount of connections in the GSM cell.
6.4
Quality of Service (QoS)
The above mentioned characteristics, data rates (in the form of values such as
“data amount per hour” and maximum data amount) and delay times are, among
others, a part of the Quality of Services.
Experience has shown that possible changes of the settings will not show any
success regarding performance improvement, as the providers always supply
"Best Effort” as QoS, i.e. the best values according to the current network load
during the moment of the connection setup.
For this reason, we spared the configuration parameters for QoS profiles for the
GPRS Ethernet.
“data amount per hour” and maximum data amount) and delay times are, among
others, a part of the Quality of Services.
Experience has shown that possible changes of the settings will not show any
success regarding performance improvement, as the providers always supply
"Best Effort” as QoS, i.e. the best values according to the current network load
during the moment of the connection setup.
For this reason, we spared the configuration parameters for QoS profiles for the
GPRS Ethernet.
Instead of QoS, GPRS will guarantee certain performance, to some degree in indi-
vidual contracts.
vidual contracts.
6.5
Delay Times
Usually, there will be marginally higher delays than with a "normal" connection
via GSM.
The delays will mostly be below one second.
via GSM.
The delays will mostly be below one second.
The average delay times are stated with 700 ms, for GSM values of 500 ms are as-
sumed. Basically, delays of several seconds are possible; the applications at the
GPRS end devices should therefore be set to maximum delay times, if possible.
sumed. Basically, delays of several seconds are possible; the applications at the
GPRS end devices should therefore be set to maximum delay times, if possible.