TLC LAPTOP GSM System, Руководство пользователя

Страница: 62 / 96

___________________________________________________________________________________
LTGSM User Manual C17 Confidential
Peak Throughput
Provides a throttle for the extension’s data by setting the fastest rate at which data may be
transmitted (measured in bytes per second).
Mean Throughput
Set the maximum amount of data which may be transmitted by the extension (measured in
bytes per hour). If set to ‘Best Effort’, as much data as current network conditions allow will be
transmitted.
Advanced Tab
Authentication Type
Sets the algorithm to be used to decrypt the Ki value e.g. ‘Milenage’ or ‘GSM-A’. Such types
would be used where the Ki’s are held on the PMX system itself. If your system uses SIM’s
issued by PMN, it is likely that the Ki values will not be divulged to you or held on your
system. They will be held centrally by PMN and authentication would take place by means of
‘authentication triplets’ sent via HTTP. Under this authentication method, your PMX system
will request authentication via one of 10 possible HTTP connections whereby a randomly
generated number is run through an algorithm and the resultant response from the SIM
checked against the result given by the central database. If the values are different,
authentication will fail. Where HTTP is used, a Ki value cannot be entered.
Ki
This is a code programmed on the SIM in addition to the IMSI. The Ki can only be determined
by means of an algorithm used during a call. The Ki cannot be determined by a card reader
and ensures that a ghosted SIM is not being used. For 3
rd
party SIM’s such as those already
supplied by a macro network provider, the Ki will be unknown to PMX and authentication will