Robustel GoRugged M1000 Pro User Guide
RT_M1000 Pro_UG_v01.01
27.12.2011
44 / 59
Confidential
Note
:
The above mentioned values represent the theoretically maximum possible values for a GPRS device. For an EDGE
device, values four times as large may be assumed.
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 depend, among
other things, on the current amount of connections in the GSM cell.
4.2.3
Delay
Usually, there will be marginally higher delays than with a "normal" connection via GPRS.
The delays will mostly be below one second. The average delay times are stated with 700 ms. Basically, delays of
several seconds are possible; the applications at the GPRS end devices should therefore be set to maximum delay
times, if possible.
4.3
Typical Applications
4.3.1
TCP Client Mode
In TCP Client mode, the M1000 Pro can actively establish a TCP connection to a pre-defined host computer when
serial data arrives. After the data has been transferred, the M1000 Pro can automatically disconnect from the host
computer by using the Inactivity time settings.
As illustrated in the figure below, data transmission proceeds as follows:
(1) The M1000 Pro, configured for TCP Client mode, requests a connection to the host.
(2) Once the connection is established, data can be transmitted in both directions between the host and the M1000
Pro bidirectional.
