r and slave is un- aware. This chapter will not discuss this type of packet testing any further. These are the main categories of testing that are available, and the testing obviously requires spe- cialized equipment to perform. So, the next section covers the type of equipment that is used for ac- curately testing clocks and network scenarios. 12.3.1 Testing Equipment Numerous companies specialize in designing and producing timing equipment, but few of them spe- cialize in timing test equipment. There is one company that is very much the de facto standard for this class of equipment: Calnex Solutions, from Edinburgh, Scotland. If you go into any lab equipped to do timing testing, there's about a 90% chance that it will have Calnex equipment on site. There are other companies that make equipment to test timing, but the authors have little or no experience with the products from other companies. For the testing of timing, Calnex currently offers three types of product: Paragon-X: Probably the most widely adopted product, it has been the mainstay of timing test- ing for a long while. It allows testing on 1-GE and 10-GE interfaces. Sentinel: A field-testing unit, which gives the engineer a portable device that can be taken to remote locations and used to take frequency and phase measurement. See the section "Field Testing" later in this chapter. Paragon-neo: An improved product from the Paragon-X, which can test up to 100-GE inter- faces and measures to higher accuracy (Class C noise generation or eSyncE wander, for example). Figure 12-9 shows a Paragon-X with the two sets of 10-GE (XFP and small form-factor pluggable- plus [SFP+]) ports on the top row, and the two sets of 1-GE (RJ-45 and SFP) ports below them. Calnex Paragon-x Status: idle (192.168 100 Figure 12-9 Calnex Paragon-X These ports are combination ports, allowing a number of possible connection options, but in total there are only two ports that can be active simultaneously: ports 1 and 2. The ports can be used either to measure or synthesize time signal