Chapter 5
| Port Connections
How to Connect to Twisted-Pair Copper Ports
– 44 –
1000BASE-T Cable Requirements
All Category 5 UTP cables that are used for 100BASE-TX connections should also
work for 1000BASE-T, providing that all four wire pairs are connected. However, it is
recommended that for all critical connections, or any new cable installations,
Category 5e (enhanced Category 5) or Category 6 cable should be used. The
Category 5e and 6 specifications include test parameters that are only
recommendations for Category 5. Therefore, the first step in preparing existing
Category 5 cabling for running 1000BASE-T is a simple test of the cable installation
to be sure that it complies with the IEEE 802.3-2008 standards.
Power-over-Ethernet The ECS4620-28P and ECS4620-52P switches support both IEEE 802.3af and IEEE
802.3at-2009 PoE standards that enable DC power to be supplied from the switch’s
RJ-45 copper ports to connected devices by utilizing certain pairs of the connecting
Ethernet cable.
For the ECS4620-28P, the total PoE power delivered by all ports cannot exceed the
maximum power budget of 410 W. This means that up to 13 ports can supply a
maximum 30 W of power simultaneously to connected devices (802.3at), or up to
24 ports can supply up to 15.4 W (802.3af).
For the ECS4620-52P, the total PoE power delivered by all ports cannot exceed the
maximum power budget of 780 W when power is provided from the RPS. This
means that up to 26 ports can supply a maximum 30 W of power simultaneously to
connected devices (802.3at), or up to 48 ports can supply up to 15.4 W (802.3af ).
Any PoE-compliant device attached to a port can directly draw power from the
switch over the Ethernet cable without requiring its own separate power source.
This capability gives network administrators centralized power control for devices
such as IP phones and wireless access points, which translates into greater network
availability.
3 Bi-directional Pair B Plus (BI_DB+)
GND (Positive V
port)
Bi-directional Pair A Plus (BI_DA+)
-52V power (Negative Vport)
4 Bi-directional Pair C Plus (BI_DC+)
-52V power (Negative Vport)
Bi-directional Pair D Plus (BI_DD+)
GND (Positive Vport)
5 Bi-directional Pair C Minus (BI_DC-)
-52V power (Negative V
port)
Bi-directional Pair D Minus (BI_DD-)
GND (Positive Vport)
6 Bi-directional Pair B Minus (BI_DB-)
GND (Positive Vport)
Bi-directional Pair A Minus (BI_DA-)
-52V power (Negative Vport)
7 Bi-directional Pair D Plus (BI_DD+)
GND (Positive Vport)
Bi-directional Pair C Plus (BI_DC+)
-52V power (Negative Vport)
8 Bi-directional Pair D Minus (BI_DD-)
GND (Positive V
port)
Bi-directional Pair C Minus (BI_DC-)
-52V power (Negative Vport)
Table 8: 1000BASE-T MDI and MDI-X Port Pinouts (Continued)
Pin MDI Signal Name MDI-X Signal Name
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