Hi
Can the HL6528 do simultaneous voice and data (gprs class a) communication? If not, are there any other Sierra Wireless modules that can do that?
Thanks
Hiya,
I havenāt used the HL6528, but a quick read of the specs indicates that it is a 2G (GSM/GPRS) device.
Itās my understanding of the 2G network that it canāt do simultaneous GSM Voice and GPRS Data. If a voice call is started, the GPRS data is āparkedā until the voice call is completed, whereupon the GPRS connection is unparked and the data transmission continues.
You may have better luck with the 3G HSPA HL8548 module - I donāt know enough about the way the HSPA network works to understand the way that voice and data are handled.
ciao, Dave
Hiya,
Thanks for the link.
Iāve been through the SiWi Product Technical Spec for the HL6528 and thereās no indication of which class (A/B/C) the module is.
Iāve done a lot of work with the Q2686, and it definitely behaves as a CLASS B device - capable of VOICE and GPRS, just not simultaneously.
Without the docs being explicit, the only way is to ask your distributor - or try it and see what happens!
ciao, Dave
Take a look at the AT+CGCLASS command. As you can see in the AT command guide Class A is not supported for HL6528.
Thank you.
So it would seem as if the HL8548 supports Class A then. Was actually looking at the HL6528 because of the dual sim, dual standby functionality, which the HL8548 unfortunately doesnāt support. Oh well, suppose one canāt get everything in life 
Hiya All.
Not having a HL6528 on my desk, I asked my distributor. They have confirmed that the HL6528 is a Class B module:
[12:33:35]AT+CGCLASS?
[12:33:35]+CGCLASS: "B"
[12:33:35]OK
[12:40:45]AT+CGCLASS=?
[12:40:46]+CGCLASS: ("B","CG","CC")
[12:40:46]OKHowever, this is only available from the AT commands guide (or running the command on a module) - not the Product Technical Spec (PTS).
It would be nice if system specs like this are in the PTS.
Such devices may well be available - but the HL6528 is not one of them.
The question is moot in Australia anyway - the major telco here (Telstra) has announced that the 2G network (GSM & GPRS) is being turned off in 2016. The other telcos (Optus & Vodaphone Aus) havenāt made any announcements yet - but I suspect that they too will turn off the 2G network in the not too distant future. So designing around 2G modules is over down here.
ciao, Dave
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