User Manual

5.7.4 Set Up Cellular CSD Dial-In

Once you have conﬁgured the carrier connection, the cellular modem can be conﬁgured to receive Circuit Switched Data

(CSD) calls.

Note: CSD is a legacy form of data transmission developed for the TDMA-based mobile phone systems like GSM. CSD uses a single radio

time slot to deliver 9.6kb/s data transmission to the GSM Network and Switching Subsystem, where it could be connected through the

equivalent of a normal modem to the Public Switched Telephone Network (PSTN) an allow direct calls to any dial-up service. CSD is provided

selectively by carriers. As such, it is important you receive a Data Terminating number as part of the mobile service your carrier provides. This

is the number that external modems will call to access the console server.

• Select the Cellular Modem panel on the System: Dial menu.

• Check Enable Dial-In and conﬁgure the Dial-In Settings.

5. Firewall, Failover and OOB Access