Do Zoom cable modems have Gigabit Ethernet ports?

Why am I not getting a Gigabit connection? According to the Zoom Cable Modems specifications, models 5341J, 5345, 5370, 5354, 5360 and 5363 have Gigabit Ethernet ports. However, I am only getting around 100 Mbps in my connection to my cable modems Ethernet port.

Answer: 

The Zoom Cable Modems do indeed have Gigabit Ethernet ports. In order to achieve Gigabit Ethernet speeds, you must connect to equipment that also has Gigabit ports, including routers, PCs, and other client devices. Fairly recent equipment supports 10/100 Ethernet only.

When the Zoom Cable Modems are connected to devices that support 10/100 Ethernet only, the LAN LEDs on the cable modems will display amber and the maximum throughput will be about 100 Mbps. The LAN LEDs will display green for a Gigabit connection.

Note: You must use category 5e or 6 Ethernet cables to achieve Gigabit speeds. The cable that came with the Motorola cable modem supports Gigabit Ethernet; you may need to upgrade cables to achieve Gigabit speeds.