A little doubt about frame relay

[julian403]

If we take a look what's a frame relay is we can resume that's a 1 and 2 layer's protocol. It was made to fix the transport's data trouble in an ISDN network.

https://en.wikipedia.org/wiki/Frame_Relay

Frame Relay is a standardized wide area network technology that specifies the physical and data link layers of digital telecommunications channels using a packet switching methodology. Originally designed for transport across Integrated Services Digital Network (ISDN) infrastructure, it may be used today in the context of many other network interfaces.

But there is what it's call virtual circuits

As a WAN protocol, Frame Relay is most commonly implemented at Layer 2 (data link layer) of the Open Systems Interconnection (OSI) seven layer model. Two types of circuits exist: permanent virtual circuits (PVCs) which are used to form logical end-to-end links mapped over a physical network, and switched virtual circuits (SVCs). The latter are analogous to the circuit-switching concepts of the public switched telephone network (PSTN), the global phone network.

That's a layer 3? Because the protocol specify differents path switching. What I'm missing?

Regards.