907-Gbe2 (Dual Gigabit Ethernet); Figure 4-7: 907-Gbe2, Dual Gigabit Ethernet Media Converter Card - Focal 907 User Manual

907-0601-00 Rev. C
4.6

907-GBE2 (Dual Gigabit Ethernet)

Card P/N
Config. Dwg.
Diagnostics:
The 907-GBE2, shown in Figure 4-7, is a Dual Gigabit Ethernet Media Converter and is used to convert two
channels of 1000 Mbps Ethernet data into optical format at the remote end and vice-versa at the console end.
The optical data rates can be 2.5 Gbaud, 1.25 Gbaud or 625 Mbaud, and these rates can be selected using
switch SW1. The 907-GBE2 can be used as a standalone card or optically integrated into a 907 system stack
via CWDM modules.
The 907-GBE2 provides two independent 10/100/1000 Mbps* Ethernet ports sharing a single optical
transceiver. The optical transceiver when operating at 2.5 Gbaud, a full 1 Gbps is available to each RJ-45
port. In the default 1.25 Gbaud mode, 1 Gbps of optical data capacity is shared between the two ports. The
625 Mbaud mode is typically used for multimode cables and provides 500 Mbps of optical data capacity
shared between the two ports. Note that any packets that cause the input buffers to overflow are simply
discarded, i.e. there is no flow control.
This media converter card can be used for multi-beam sonar devices running "dual head" configurations, or
for any application that requires simultaneous yet dedicated point-to-point "switchless" connections over fiber.
The physical layer interface also minimizes latency.
The 907-GBE2 has on-board SFP diagnostics, which are transmitted over the optical link with the user-
Ethernet traffic to the 907-GBE2 console card. A 907-DIAG-E diagnostics card stacked on the console card
can read diagnostic information from the 907-GBE2 remote and console cards. Diagnostic-specific data
accounts for less than 0.1% of the total throughput from the remote to console, and are transmitted at a lower
priority than user-based traffic. The 907-GBE2 may also be configured as a diagnostic master to read
diagnostics from other cards in the stack, as per the 907-GBES. Details of the 907-DIAG-E card and the
CWDM modules are provided in the System Modules section.
The 907-GBE2 cards are available in pressure tolerant versions with a 6000 psi rating.

Figure 4-7: 907-GBE2, Dual Gigabit Ethernet Media Converter Card

*Cards with serial number lower than 10019957 support only 1000 Mbps on the RJ-45 ports unless they have
been reprogrammed with firmware version A1 or higher.
Focal Technologies Corp.
907-0030-XX
907-2040-00
907-DIAG-E Compatible
Model 907 Video/Data Multiplexer – User's Guide
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