The Cisco 1000BASE SX GBIC is an interchangable input/output device that connects to a gigabit ethernet port/slot, linking the port with the fiber-optic network.
The product code Cisco ASA 5520 is associated with the market leading adaptive security appliances delivered by the brand Cisco with reputation for lasting long.
Popular product models of Cisco hubs are the Cisco 1538 Series Micro Hubs. However, Cisco also owns Linksys so most popular Linksys hub models could technically also be regarded as Cisco, like for example the EW5HUB Ethernet Workgroup Hub.
Cisco PoE stands for Cisco Power over Ethernet. Cisco Power over Ethernet provides wireless service, along with internet service is the United States.
Information can be found on Cisco's website. From the homepage, there is a heading called Products and Services, where all Cisco's current product information can be found. Clicking on that brings you to a page with the heading of Security, where information on the Cisco ASA 5505 is located because it is a firewall.
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A Cisco 4506 is a computer system that runs Cisco Catalyst. It is one of the mid-ranged models in it's league and is considered to be fairly decent for it's price and what it has to offer.
Netflow is a Cisco product to analyze network bandwidth usage.
There is some debate on whether the Cisco ASA 5510 is a good product. One might find reviews for the product on a seller page of Amazon or at Consumer Reports.
Any Cisco product purchased should come with a warranty and more importantly, an activation key e-mail should be sent to you; then you'll know it's genuine.
The Cisco 4507 can be upgraded using the regular method for upgrading the software image on these kind of devices. Cisco provides a manual and information for how it can be upgraded.
I think you may mean CUCM, which is the "Cisco Unified Communications Manager, "the "brains" of a Cisco Unified Communications system. The product used to be called "Cisco Unified Call Manager" and before that just "Call Manager."