NETGEAR EN516 - Hub - EN Manuale utente
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This chapter provides information on:
·Preparing the site
·Package contents
·Required tools
·Installing the hub
·Connecting the hub
·Completing and verifying the installation
Preparing the Site
Before you begin installing the Model EN516 hub, prepare the installation site.
Make sure the operating environment meets the physical requirements of the hub.
The ambient temperature must be between 0° C and 40° C. The maximum relative
humidity must not exceed 90%.
You can install the hub on a flat surface, such as a tabletop or shelf, or within a
standard 19-inch rack. You should ensure that the front and rear panel of all units
to be connected are easily accessible for connecting cables and power and for
monitoring the LED indicators.
Package Contents
The package should contain the following items:
·Model EN516 hub
·This manual
·AC power cord
·Rack mount kit
·Four rubber pads for installation on a flat surface
·One BNC T-connector
·One BNC terminator
·Warranty and Owner Registration Card
CAUTION:Use the appropriate power cord as required by your national
electrical codes and ordinances.
Call your dealer if there are any wrong, missing, or damaged parts. Keep the
carton, including the original packing materials. Use them to repack the hub if
there is a need to return it for repair.
Be sure to complete the Owner Registration Card and return it to NETGEAR to
qualify for product updates and product warranty registration.
Required Tools
To install the hub on a flat surface, you do not need any special tools. However, to
install the hub in a rack, you need the following tools:
·#1 Phillips screwdriver to attach mounting brackets
·#2 Phillips screwdriver to tighten mounting screws
Installing the Hub
To install the Model EN516 hub, follow these steps:
1. Unpack the hub.
2. Choose a location near the devices to be connected and close to an
electrical outlet.
3. Follow the instructions for installing the hub on a flat surface or in a
rack.
Installing the Hub on a Flat Surface
To install the hub on a flat surface such as a tabletop or shelf, follow these steps:
1. Install self-adhesive pads on the bottom of the hub.
Peel off the protective backing from the rubber pads and apply one at each
marked location on the bottom of the hub.
2. Set the hub on a tabletop or shelf so that it has at least 2 inches (5 cm) of
space on all sides.
Restricted air flow could cause overheating.
3. Install any PCs, additional hubs, or other devices in your stack.
For information on connecting the hub, refer to "Connecting the Hub" on
page 3-4.
Installing the Hub in a Rack
To install the hub in a rack, follow these steps:
1. Attach the mounting brackets (supplied in the rack mounting kit) to the
sides of the hub using the screws provided.
Hold a mounting bracket against each side of the hub, as shown in Figure
3-1, and align the countersunk screw holes in the bracket with the bracket
mounting holes in the hub. Use a #1 Phillips screwdriver to tighten the
screws to secure each bracket.
2. Attach the hub (with the mounting bracket) to the rack using two
pan-head screws with nylon washers.
Use a #2 Phillips screwdriver and tighten the screws to secure the hub to
the rack.
3. Install any PCs, additional hubs, or other devices in your stack.
For information on connecting the hub, refer to "Connecting the Hub" on
page 3-4.
Figure 3-1. Installing mounting brackets to the hub and to a rack
Connecting the Hub
This section discusses connecting to the hub, cascading to multiple hubs, and
connecting to other NETGEAR products. For instructions on connecting to the
ports or connecting to other NETGEAR products, refer to the following sections:
·"Connecting to the RJ-45 Ports" on this page
·"Connecting to the BNC Port" on page 3-7
·"Connecting to the AUI Port" on page 3-9
·"Connecting to Other NETGEAR Products" on page 3-10
Connecting to the RJ-45 Ports
You can connect PCs, Apple Macintosh computers, UNIX workstations, and any
device equipped with a 10BASE-T Ethernet interface to the RJ-45 ports on the
Model EN516 hub using twisted pair Ethernet cables.
The twisted pair cable extended from an RJ-45 port (or UTP port) is called a
twisted pair segment and can be up to 100 m in length. The UTP ports, with the
exception of port 16, are MDI-X (or Normal) ports. To connect any of the
Normal ports to a PC, a server, or another device with an MDI (or Uplink) port,
you can simply use a regular UTP cable. To connect any of the Uplink ports to
another Uplink port, use an RJ-45 crossover cable.
Port 16 is switchable between Normal (MDI-X) and Uplink (MDI) positions and
should be configured according to the following guidelines:
·Set the Normal/Uplink push button to the Normal position and use a
straight-through cable if the remote end of the cable is connected to an
MDI-wired device such as a PC.
·Set the Normal/Uplink push button to the Uplink position and use a
straight-through cable if the remote end of the cable is connected to an
MDI-X device such as a 10 Mbps or 100 Mbps hub or repeater.
For further cabling guidelines, refer to Appendix B, "Cabling Specifications."
Refer to the following illustrations for connecting to the RJ-45 ports and proceed
to "Completing and Verifying the Installation" on page 3-11.
Figure 3-2 illustrates a workstation connected to an RJ-45 port on the Model
EN516 hub.
Figure 3-2. Connecting a workstation to an RJ-45 port on the Model EN516
hub
NOTE: Ethernet specifications limit segments to 328 feet (100 m) in
length.
Cascading refers to connecting hubs together to increase the number of ports, or
the number of users supported on the network. The RJ-45, BNC, or AUI ports
can be used to cascade hubs together. Figure 3-3 illustrates multiple hubs
cascaded in a hierarchical star.
Figure 3-3. Cascading multiple hubs in a hierarchical star through the RJ-45
ports
NOTE: Ethernet specifications limit the number of hubs in any
communication path to five hubs, as shown in Figure 3-3. For example,
when PC "A" communicates with PC "B," the communication path goes
from hub 5 to hub 7, passing through hubs 2, 1, and 4.
Figure 3-4 illustrates multiple hubs cascaded in a daisy-chain style.
Figure 3-4. Cascading multiple hubs daisy-chain style through the RJ-45
ports
NOTE: Each twisted pair cable between two hubs is counted as one
network segment. When cascading hubs daisy-chain style through the
twisted pair cable, stay within Ethernet specifications and make sure the
total hub count does not exceed five hubs.
Connecting to the BNC Port
The BNC port at the rear panel of the Model EN516 hub is used for connecting to
a thin coaxial segment. You can connect servers, workstations, or other devices to
the BNC port or several Model EN516 hubs as shown in Figure 3-5. By using the
BNC port for cascading, you treat each connected hub as just another node on the
coaxial segment.
When using the BNC interface, follow these steps:
1. Insert the BNC T-connector on the BNC port of the Model EN516
hub.
2. Connect the coaxial cable that leads from a device on the network to
one of the self-locking ends of the BNC T-connector.
3. Connect the coaxial cable from another device to the remaining end of
the self-locking BNC T-connector. If there are no more devices to be
connected, terminate the connection with the 50 Ohm terminator that
is provided with the product.
4. Proceed to "Completing and Verifying the Installation" on page 3-11.
Figure 3-5 illustrates three hubs cascaded through the BNC connector. The
separation marks in the coaxial cable between the two top hubs illustrate the
incorporation of other devices and show that interconnection is not limited to
hubs.
Figure 3-5. Cascading hubs through the BNC port
NOTE: Ethernet specifications limit a BNC segment to 30 stations,
specify a minimum of 0.5 m between any two stations, and limit segments
to 600 feet (185 m) in length.
For further information about using coaxial cables, refer to Appendix B, "Cabling
Specifications."
Connecting to the AUI Port
The AUI port at the rear panel of the Model EN516 hub is normally used for
connecting a thick coaxial segment.
When using the AUI port, refer to Figure 3-6 and follow these steps:
1. Connect the AUI port on the hub to an external coaxial transceiver
through an AUI transceiver cable.
With the right type of transceiver, you could use the AUI port to connect to
most types of network media, including 10BASE-T twisted pair, thin
coaxial, thick coaxial, and 10BASE-FL fiber optic cables.
2. Disable the signal quality error (SQE) test function for each external
transceiver connected to the AUI port.
Refer to your transceiver documentation for information about disabling the
SQE test function.
NOTE: If the SQE test function is not disabled, the port is automatically
partitioned.
3. Proceed to "Completing and Verifying the Installation" on page 3-11.
Figure 3-6. Cascading hubs through the AUI port
NOTE: Ethernet specifications limit segments to 100 stations and 1,640
feet (500 m) in length, and specify that the AUI cable between the hub and
the transceiver is limited to 164 feet (50 m).
Connecting to Other NETGEAR Products
You can extend your network by connecting to an Ethernet switch, such as the
NETGEAR Model SW507 Ethernet Switch. Figure 3-7 illustrates power users on
a 100 Mbps network using the NETGEAR Model FE516 Fast Ethernet Hub and
connecting to the 10 Mbps network through a Model SW507 switch.
Figure 3-7. Connecting multiple NETGEAR products
Completing and Verifying the Installation
To complete the installation, connect the power cord first to the power entry
receptacle on the hub rear panel and then to the power outlet on the wall. When
power has been applied to the hub, the following conditions should exist:
·Green Power LED on the front panel is on.
·Yellow BNC Partition LED is on if the BNC port is not connected.
·Green Link/Rx LED on each connected port is on.
If there are any problems, refer to Chapter 4, "Troubleshooting."
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