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903-0623-00 Rev. A
6.3
GBES 4 Port Gigabit Ethernet Switch Board
Card P/N 903-5087-XX
The GBES (Quad Gigabit Ethernet Switch) interface board is a media converter card for fiber optic
transmission of Gigabit Ethernet between the remote and console modules. The GBES card operates as
a 4-port switch, eliminating the need for external switches prior to conversion of the electrical Ethernet
links to optical signals. A front panel view of the card in Figure 6.3-1 shows pin and LED locations on the
RJ-45 jacks.
6.3.1 Input/Output
The GBES media converter card is used to transmit up to four copper ports of 10/100/1000 Mbps
Ethernet traffic over a bidirectional optical link via an on-board SFP optical transceiver. Packet traffic on
the optical link is shared among the four copper ports, and the maximum aggregate throughput of the
GBES card is 1 Gbps in each uplink and downlink direction. Standard flow control procedures are used
by the switch to throttle back incoming packets when buffers are full, which may or may not be relevant to
specific applications, e.g. by causing delays in packet deliveries.
Focal Technologies Corp.
Model 903 User's Guide, FMB-X-2.5 Version
Figure 6.3-1: GBES Front Panel
Page 6-8
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