H3C Technologies H3C SR6600 - Manual (Page 44)

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Figure 36 Connecting the AUX port to a modem
Connecting an Ethernet cable
Overview
10/100 Mbps Ethernet uses category-5 twisted pair cables, while 1000 Mbps Ethernet uses category-5
enhanced or category-6 twisted pair cables. Twisted pair cables include straight-through cables and
crossover cables.
Category-5 cables provide a transmission frequency of 100 MHz for voice and data transmission; they
are mainly used in 100Base-T and 10Base-T networks. Category-5 cables are common Ethernet cables,
which can also be used to transmit 1000 Mbps Ethernet data.
Category-5 enhanced cables feature low attenuation and crosstalk, providing higher attenuation to
crosstalk ratio (ACR), less delay error and higher performance than category-5 cables. Category-5
enhanced cables are mainly used in 1000 Mbps Ethernet networks.
Category-6 cables provide a transmission frequency of 1 MHz to 250 MHz, and improve the
performance on crosstalk and return loss. A fine better return loss performance is extremely important for
new-generation full-duplex high-speed networks. Category-6 cables have sufficient power sum ACR
(PS-ACR) when operating at 200 MHz. They provide a bandwidth two times than that of category-5
enhanced cables, thus featuring a higher transmission performance. Therefore, category-6 cables are
suitable for applications requiring a transmission speed of more than 1 Gbps.