Metrolinx doesn't -- and hasn't ever -- used its P25 radio system for any kind of Presto data as you claim. In fact, the Presto BFTPs aren't even connected to the radios in the buses.
I never claimed they did. My claim was in response to Amnesia June's one for the TTC and buses.
Correct. It's not some "different protocol" -- it's plain ol' 802.11 Wi-Fi.
Read further. It's the WAN. Just because you use 802.11 doesn't mean you're using Internet Protocol. It's a frequency assignment used for many things, including microwave ovens for some of the sub-bands.
IEEE 802.11 is a set of
media access control (MAC) and
physical layer (PHY) specifications for implementing
wireless local area network (WLAN) computer communication in the 900 MHz and 2.4,
3.6, 5, and
60 GHz frequency bands. They are created and maintained by the
Institute of Electrical and Electronics Engineers (IEEE)
LAN/
MAN Standards Committee (
IEEE 802). The base version of the standard was released in 1997, and has had subsequent amendments. The standard and amendments provide the basis for wireless network products using the
Wi-Fi brand. While each amendment is officially revoked when it is incorporated in the latest version of the standard, the corporate world tends to market to the revisions because they concisely denote capabilities of their products. As a result, in the marketplace, each revision tends to become its own standard. [...]
https://en.wikipedia.org/wiki/IEEE_802.11
I could get technical, but that hopefully should explain it. You can use *the same trunk* to carry *many* protocols. (the modulation method is key to this, in almost all cases, digital) Wi-Fi is a proprietary one, and is misused constantly. It's all a matter of what you modulate on the carrier, the carrier being, in this instance, in the 802.11 bands.
Not correct. The fare gates use standard 802.11 (Wi-Fi), not some "different protocol" as you claim. The Presto devices in streetcars and buses also use 802.11, and accommodate a cellular modem.
I see, if that's the case, then they should be able to buy everything off the shelf from their local internet provider...think of all the money saved. And the glaring exposure to hacking. It will be a closed "private" tunnel.
The CIS radio/telemetry backup system is over Bell's CDMA network, not Rogers' GSM network. Further, the TETRA radio system will not carry any Presto data. This is for a similar reason to Metrolinx's P25 network: there simply isn't enough spectrum allocated to do so. The Presto data will be relayed exclusively by a cellular modem. See the diagram below:
I stated that Rogers analog system would no longer be available. Best you read back. I didn't indicate who the new provider would be, because last time I checked, it hadn't been made clear.
And I think you'd best look at the diagram you posted.
According to that, Presto is a stand alone system, taking an input from GPS for location, and transmitting discreetly by cell, not 802.11. As you state: "The Presto data will be relayed exclusively by a cellular modem." Indeed, and not "Wi-Fi" as was prior claimed.
In all fairness, that diagram is incomplete, and an actual schematic would better show sub-systems and carriers. Metrolinx themselves might have requirements on keeping info gathered from Presto Cards proprietary, other than what they are contractually obligated to share with the operator. I don't know on that, but the fact that there is no subsidiary channel is curious (for back-up in case of a localized system failure)
There is nothing in anything you post to indicate the use of "Wi-Fi" protocol save for passenger use when that is provided on the buses and/or streetcars.
I hope we can put this to rest, and that everybody can learn a lesson from this: calling something by a technically inaccurate but intuitive and clear name isn't a reason to nitpick or needlessly belittle people.
Steve X took me to task, and now so do you, and you present information that continues to be misleading and inaccurate.
