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903-0623-00 Rev. A
5.5.1 Input/Output
The three ports on the front panel accept industry standard RJ-45 UTP (Unshielded Twisted Pair) or STP
(Shielded Twisted Pair) Cat 5e cables wired per EIA/TIA-568. All of the twisted pair ports are transformer-
coupled to the internal switching hub, which has additional on-board filtering. Packets sent into one of the
front panel ports will be routed by the switch only to the port associated with the matching MAC address,
be it on one of the local ports or one of the ports at the other end of the system. (Broadcast and multi-cast
packets are sent to all ports.) An internal 64 KB buffer is shared among all of the ports for storing and
forwarding packets.
All front panel RJ-45 ports have auto-MDI/MDI-X configuration so that the jacks may be used with either
"straight through" cables (wired to EIA/TIA-568B on both ends) or "cross-over cables (wired to
EIA/TIA-568A on one end and EIA/TIA-568B on the other end). Auto-negotiation and auto-MDI/MDIX
configuration are activated each time a new link is being established between the EIB-10/100 port and the
external device, for example after power up or after changing a cable.
The pin assignments of the RJ-45 jacks are summarized in Table 5.1-1. Typically, the switch port should
be in MDI configuration for connection to NICs (network interface cards) and in MDI-X configuration for
connection to other repeating hubs and switches.
RJ-45 Contact
LED
The green LED on each RJ-45 jack is on when there is a link pulse present, indicating
Green
an external device is connected with a valid Ethernet link. The green LED flashes
(RJ-45)
during packet transfers.
The amber LED on each RJ-45 jack is on if the link is full duplex and off if the link is
half duplex. When operating in half-duplex mode, the LED flashes when there is a
Amber
collision. Normally the amber LEDs should be on at all times when the external
(RJ-45)
equipment supports full-duplex operation. Some equipment, such as web cameras
and older Ethernet gear, do not support full-duplex operation.
The T and R LEDs at the bottom of the panel indicate traffic through a fourth port on
the switching hub connected to the backplane. The green TX LED indicates data
T and R
traffic arriving from the backplane and leaving the front panel, and the red RX LED
(Bottom
indicates data traffic coming in the front panel and being sent to the backplane.
Panel)
The T and R LEDs are off when the optical version of the EIB-10/100 card is used.
Focal Technologies Corp.
Table 5.5-1: RJ-45 Pin Assignments
MDI-X
1
TXD+
2
TXD-
3
RXD+
Unused
4
5
Unused
6
RXD-
7
Unused
8
Unused
Table 5.5-2: EIB-10/100 Front Panel LEDs
Description
Model 903 User's Guide, FMB-X-2.5 Version
MDI
RXD+
RXD-
TXD+
Unused
Unused
TXD-
Unused
Unused
Page 5-17
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