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User Manual for the NETGEAR 7300S Series Layer 3 Managed Switch Software
B-6
Cabling Guidelines
202-10088-01, March 2005
Unlike 10BASE-T and 100BASE-TX, which use only two of the four pairs of wires within the
Category 5, 1000BASE-T uses all four pairs of the twisted pair. Make sure all wires are tested
⎯
this is important.
Factors that affect the return loss are:
The number of transition points, as there is a connection via an RJ-45 to another connector, a patch
panel, or device at each transition point.
Removing the jacket that surrounds the four pairs of twisted cable. It is highly recommended that,
when RJ-45 connections are made, this is minimized to 1-1/4 inch (32 mm).
Untwisting any pair of the twisted-pair cabling. It is important that any untwisting be minimized to
3/8 inch (10 mm) for RJ-45 connections.
Cabling or bundling of multiple Category 5 cables. This is regulated by ANSI/EIA/TIA-568A-3. If
not correctly implemented, this can adversely affect all cabling parameters.
Near End Cross Talk (NEXT)
This is a measure of the signal coupling from one wire to another, within a cable assembly, or
among cables within a bundle. NEXT measures the amount of cross-talk disturbance energy that is
detected at the near end of the link — the end where the transmitter is located. NEXT measures the
amount of energy that is “returned” to the sender end. The factors that affect NEXT and cross talk
are exactly the same as outlined in the Return Loss section. The cross-talk performance is directly
related to the quality of the cable installation.
Patch Cables
When installing your equipment, replace old patch panel cables that do not meet Category 5e
specifications. As pointed out in the NEXT section, this near end piece of cable is critical for
successful operation.
RJ-45 Plug and RJ-45 Connectors
In a Fast Ethernet network, it is important that all 100BASE-T certified Category 5 cabling use
RJ-45 plugs. The RJ-45 plug accepts 4-pair UTP or shielded twisted-pair (STP) 100-ohm cable
and connects into the RJ-45 connector. The RJ-45 connector is used to connect stations, hubs, and
switches through UTP cable; it supports 10 Mbps, 100 Mbps, or 1000 Mbps data transmission.
Page 377 / 400
User Manual for the NETGEAR 7300S Series Layer 3 Managed Switch Software
Cabling Guidelines
B-7
202-10088-01, March 2005
Figure 12-6
shows the RJ-45 plug and RJ-45 connector.
Figure 12-6:
RJ-45 Plug and RJ-45 Connector with Built-in LEDs
Table 12-1
lists the pin assignments for the 10/100 Mbps RJ-45 plug and the RJ-45 connector.
Table 12-1.
10/100 Mbps RJ-45 Plug and RJ-45 Connector Pin Assignments
Table E-2 lists the pin assignments for the 100/1000 Mbps RJ-45 plug and the RJ-45 connector.
PIN
NORMAL ASSIGNMENT ON
PORTS 1 TO 8
UPLINK ASSIGNMENT ON
PORT 8
1
Input Receive Data +
Output Transmit Data +
2
Input Receive Data –
Output Transmit Data –
3
Output Transmit Data +
Input Receive Data +
6
Output Transmit Data –
Input Receive Data –
4, 5, 7, 8
Internal termination, not used for data transmission
Page 378 / 400
User Manual for the NETGEAR 7300S Series Layer 3 Managed Switch Software
B-8
Cabling Guidelines
202-10088-01, March 2005
Table 12-2.
100/1000 Mbps RJ-45 Plug and RJ-45 Connector Pin Assignments
Conclusion
For optimum performance of your 1000BASE-T product, it is important to fully qualify your cable
installation and ensure it meets or exceeds ANSI/EIA/TIA-568-A:1995 or ISO/IEC 11801:1995
Category 5 specifications. Install Category 5e cable where possible, including patch panel cables.
Minimize transition points, jacket removal, and untwist lengths. Bundling of cables must be
properly installed to meet the requirements in ANSI/EIA/TIA-568A-3.
PIN
CHANNEL
DESCRIPTION
1
2
A
Rx/Tx Data +
Rx/Tx Data
3
6
B
Rx/Tx Data +
Rx/Tx Data
4
5
C
Rx/Tx Data +
Rx/Tx Data
7
8
D
Rx/Tx Data +
Rx/Tx Data
Page 379 / 400
Glossary
C-1
202-10088-01, March 2005
Appendix C
Glossary
Use the list below to find definitions for technical terms used in this manual.
Numeric
802.1D
The IEEE designator for Spanning Tree Protocol (STP). STP, a link management protocol, is part of the
802.1D standard for media access control bridges. Using the spanning tree algorithm, STP provides path
redundancy while preventing endless loops in a network. An endless loop is created by multiple active paths
between stations where there are alternate routes between hosts. To establish path redundancy, STP creates a
logical tree that spans all of the switches in an extended network, forcing redundant paths into a standby, or
blocked, state. STP allows only one active path at a time between any two network devices (this prevents the
loops) but establishes the redundant links as a backup if the initial link should fail. If STP costs change, or if
one network segment in the STP becomes unreachable, the spanning tree algorithm reconfigures the
spanning tree topology and reestablishes the link by activating the standby path. Without spanning tree in
place, it is possible that both connections may be simultaneously live, which could result in an endless loop
of traffic on the LAN.
802.1P
The IEEE protocol designator for Local Area Network (LAN). This Layer 2 network standard improves
support of time critical traffic, and limits the extent of high bandwidth multicast traffic within a bridged
LAN. To do this, 802.1P defines a methodology for introducing traffic class priorities. The 802.1P standard
allows priority to be defined in all 802 MAC protocols (Ethernet, Token Bus, Token Ring), as well as in
FDDI. For protocols (such as Ethernet) that do not contain a priority field, 802.1P specifies a method for
indicating frame priority based on the new fields defined in the 802.1Q (VLAN) standard.
802.1Q VLAN
The IEEE protocol designator for Virtual Local Area Network (VLAN). This standard provides VLAN
identification and quality of service (QoS) levels. Four bytes are added to an Ethernet frame to allow eight
priority levels (QoS) and to identify up to 4096 VLANs. See “VLAN” on page 21 for more information.
10BASE-T
The IEEE specification for 10 Mbps Ethernet over Category 3, 4, or 5 twisted-pair cable.
100BASE-FX
The IEEE specification for 100 Mbps Fast Ethernet over fiber-optic cable.
Page 380 / 400
User Manual for the NETGEAR 7300S Series Layer 3 Managed Switch Software
C-2
Glossary
202-10088-01, March 2005
100BASE-TX
The IEEE specification for 100 Mbps Fast Ethernet over Category 5 twisted-pair cable.
1000BASE-SX
The IEEE specification for 1000 Mbps Gigabit Ethernet over fiber-optic cable.
1000BASE-T
The IEEE specification for 1000 Mbps Gigabit Ethernet over Category 5 twisted-pair cable.
gain access.
A
ABR
See “Area Border Router” on page 2.
Access Control List
An ACL is a database that an Operating System uses to track each user’s access rights to system objects
(such as file directories and/or files).
ACL
See “Access Control List” on page 2.
Address Resolution Protocol
An Internet Protocol that dynamically maps Internet addresses to physical (hardware) addresses on a LAN.
Advanced Network Device Layer/Software
Term for the Device Driver level.
Aging
When an entry for a node is added to the lookup table of a switch, it is given a timestamp. Each time a packet
is received from a node, the timestamp is updated. The switch has a user-configurable timer that erases the
entry after a certain length of time with no activity from that node.
Area Border Router
A router located on the border of one or more OSPF areas that connects those areas to the backbone
network. ABRs are considered members of both the OSPF backbone and the attached areas. They therefore
maintain routing tables describing both the backbone topology and the topology of the other areas. (Cisco
Systems Inc.)
ARP
See “Address Resolution Protocol” on page 2.

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