C
HAPTER
1
| Introduction
Description of Hardware
– 18 –
ES-3026/3026P
D
ESCRIPTION
OF
H
ARDWARE
10/100BASE-T
P
ORTS
The switch contains 24 RJ-45 ports that operate at 10 Mbps, or 100 Mbps,
half or full duplex. Because these ports support automatic MDI/MDI-X
operation, you can use straight-through cables for all network connections
to PCs or servers, or to other switches or hubs.
Each of these ports supports auto-negotiation, so the optimum
transmission mode (half or full duplex), and data rate (10, or 100 Mbps)
can be selected automatically. If a device connected to one of these ports
does not support auto-negotiation, the communication mode of that port
can be configured manually.
Each port also supports IEEE 802.3x auto-negotiation of flow control, so
the switch can automatically prevent port buffers from becoming
saturated.
SFP T
RANSCEIVER
S
LOTS
The Small Form Factor Pluggable (SFP) transceiver slots are shared with
Gigabit RJ-45 ports 25~26. In the default configuration, if an SFP
transceiver (purchased separately) is installed in a slot and has a valid link
on the port, the associated RJ-45 port is disabled. The switch can also be
configured to force the use of an RJ-45 port or SFP slot, as required.
The following table shows a list of transceiver types which have been
tested with the switch. For an updated list of vendors supplying these
transceivers, contact your local dealer. For information on the
recommended standards for fiber optic cabling, see
Table 1: Supported SFP Transceivers
Media Standard
Fiber Diameter
(microns)
Wavelength
(nm)
Maximum Distance
a
a.
Maximum distance may vary for different SFP vendors.
1000BASE-SX
50/125
850
700 m
62.5/125
850
400 m
1000BASE-LX
50/125
1300
550 m
62.5/125
1300
550 m
9/125
1300
10 km
1000BASE-LH
9/125
1310
35 km
1550
80 km
100BASE-FX
50/125 or 62.5/125
1300
2 km
9/125
1300
20 km
1000BASE-T
100 m
