907-Gbes (Quad Gigabit Ethernet Switch); Figure 4-8: 907-Gbes Media Converter Card - Focal 907 User Manual

907-0601-00 Rev. C

4.7 907-GBES (Quad Gigabit Ethernet Switch)

Card P/N
Config. Dwg.
Diagnostics:
The Quad-port Gigabit Ethernet Switch (GBES) media converter card, shown in Figure 4-8, 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 via
an Ethernet Switch, and the maximum aggregate throughput of the 907-GBES 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. Although the switch provides advanced management of the Ethernet traffic, it does
introduce latency, typically in the hundreds of microseconds.
The 907-GBES has on-board SFP diagnostics, which are transmitted over the optical link with the user-
Ethernet traffic to the 907-GBES console card. A 907-DIAG-E diagnostics card stacked on the console card
can read diagnostic information from the 907-GBES remote and console cards. Diagnostic-specific data
accounts for less than 0.1% of the total Gigabit throughput from the remote to console, and are transmitted at
a lower priority than user-based traffic.
Like the 907 motherboards, the 907-GBES can be configured as a diagnostic master to read the diagnostic
information from other diagnostic-capable cards in the stack. As with the on-board SFP diagnostics,
diagnostic data collected from cards in the remote stack can be packaged and transmitted by the 907-GBES
remote card over the optical link.
The 907-GBES card can supply +5 VDC power to other stacked cards or receive +5 V power from other cards
in the stack. In this way, the 907-GBES card behaves like a 907 motherboard or a 907 media converter. Each
907-GBES is fuse limited to 5.0 A for on-board current draw plus total current draw from the stacked cards.
The 907-GBES cards are available in pressure tolerant versions with a 6000 psi rating.
Focal Technologies Corp.
907-0027-XX
907-2037-00
907-DIAG-E Compatible

Figure 4-8: 907-GBES Media Converter Card

Model 907 Video/Data Multiplexer – User's Guide
Page 4-8