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903-0623-00 Rev. A
Ethernet connections are made using standard RJ-45 jacks with standard Gigabit Ethernet pinouts. The
copper interface meets or exceeds the IEEE 802.3ab standard. External cables should meet or exceed
Cat 5e EIA/TIA 568A/B specifications.
GBES cards in a Model 903 system use a CWDM optical channel wavelength (e.g. 1471 nm) for an
uplink and a separate CWDM channel (e.g. 1491 nm) as a downlink.
Optical output power of the GBES card is typically > -4 dBm at the LC bushing of the on-board SFP
transceiver. Optical sensitivity of the GBES card is typically < -28dBm, also at the on-board SFP
transceiver. However, overall flux budget of any optical link in the system is specified as 20 dB minimum,
accounting for losses in CWDMs and connectors.
Diagnostics can be retrieved from the GBES through the Backplane -X and the FMB-X-2.5 diagnostic
ports. The diagnostics information consists of the switch settings, optical link status, SFP diagnostics and
RJ45 port link status.
6.3.2 Configuration Settings
A side view of the GBES card is given in Figure 6.3-2. Default switch settings for the GBES card are given
in Table 6.3-1. Note that both switches are for factory use only and should never be changed from the
default positions.
Focal Technologies Corp.
Table 6.3-1: GBES Switches Default Settings
SWITCH 1
SW1:1
DEFAULT
OFF
SWITCH 2
SW2:1
DEFAULT
OFF
X = DON'T CARE
Figure 6.3-2: GBES Side View
Model 903 User's Guide, FMB-X-2.5 Version
SW1:2
SW1:3
SW1:4
ON
OFF
SW2:2
SW2:3
SW2:4
ON
X
X
X
Page 6-9
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