Implementation Considerations

Before we get to applications, a word about implementing DQSA. DQSA can be implemented in a single chip. An example is the 200 Mbps prototype passive fiber NIC (Network Interface Card) shown in Figure 1. A thousand-node network requires only one of these NICs at each node plus the fiber connecting the nodes – there is no central switch or control. A DQSA driver can look and feel just like an Ethernet driver. The only clue that DQSA, and not Ethernet, was operating would be in the greatly improved performance (e.g. low latency, commingled asynchronous packets and synchronous channels, distance insensitivity, etc).   In addition to mimicking Ethernet, DQSA can be configured to look like an ATM switch.   Ditto for Frame Relay or any other frame format.    Again, the only thing distinguishing DQSA from the original would be the superior performance.

Figure 1: Prototype DQSA Passive Fiber NIC

Where does DQSA Function?

In the standard layered architecture, DQSA implements the MAC/Data Link. In a standard TCP/IP stack, it resides above the physical layer and below the network layer (see Figure 2).   All higher layer protocols are supported.  

Figure 2: DQSA in the Standard Layered Architecture

A Disruptive Technology?

DQSA’s flexibility allows it to be configured as an “IP switch,” permitting the typical TCP/IP stack to be implemented as shown in Figure 3. Thus, local or metro area networks could be built without the almost universally used Ethernet.

We discuss elsewhere how DQSA eliminates the need for routers in wide area networks. DQSA also eliminates the need for Ethernet in local and metro area networks. Changes on this scale suggest that DQSA can be described as a disruptive technology.

Figure 3: Eliminating Ethernet

The Applications

DQSA has a potential role in virtually all of communications.   Here are a few examples with illustrations and comments: cluster computing, routerless networks, LEO satellites, cell phone networks, and metro Ethernet.  

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