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Hi and welcome to this short demonstration video of LTE to wideband CDMA circuit switched
fallback. Circuit switched fallback is a mechanism by which a device connected and transferring
data on LTE, when it’s paged with an incoming voice connection, it will transfer, it will
fall back to W-CDMA or GSM in order to take that voice call using circuit switched resources.
I have here a mobile device, which is connected via this combiner to both an 8960 and the
PXT instrument. The 8960 is emulating the W-CDMA HSPA network cell. The PXT is emulating
the LTE cell and the core network.
Both of these are connected to a server PC so that I can demonstrate data connectivity
by pinging the device while we transition from LTE to W-CDMA for the voice call. The
first thing I am going to do is switch on the mobile device, and you should see it connect
into the LTE cell here. When I ping the device, you can see that I’m getting a reply from
its IP address. I am going to switch the W-CDMA cell on, and I’m going to send a circuit
switched service notification to the device, which will cause it to leave the LTE network
and come into the circuit switched domain. Here you can see that we have an alerting.
I am going to accept the call, if I put you on speaker, you can see that I have call setup
and then alerting. So we have an active voice connection here, and we also continued with
our data connectivity here. Up on the server screen you can see that we timed out for a
moment on data when we transitioned from LTE to the 8960 and the data connectivity has
continued with the same IP address as we would see in a regular network. This functionality
on the PXT and 8960 is also available for LTE to GSM, GPRS, or EGPRS at circuit switched
fallbacks. Thank you very much for watching this short demonstration video.