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903-0623-00 Rev. A
Model 903 User's Guide, FMB-X-2.5 Version
6.2.1 Input/Output
The front panel Input/Output ports, RJ-45 pin assignments and front panel LEDs of the optical and
electrical versions of the EIB-10/100 card are the same. Please refer to section 5.5.1 of this manual for
more details.
6.2.2 Configuration Settings
The configuration settings of the optical and electrical versions of the EIB-10/100 card are the same.
Please refer to section 5.5.2 of this manual for more details.
6.2.3 Flow Control
The flow control performed by the EIB-10/100 card is the same for both versions of the card (optical and
electrical). Please refer to section 5.5.3 of this manual for more details.
6.2.4 Optical Configuration
Most optical versions of the EIB-10/100 card are CWDM-based modules identified with the wavelength of
the CWDM laser as a suffix, e.g. EIB-10/100-1470 has a 1470 nm CWDM laser. The CWDM laser allows
the card to be integrated in a "pure" CWDM system, where all cards use CWDM components, or with
standard 1310/1550 nm FMBs, which may be used with 1470 nm and 1490 nm wavelengths only.
Each EIB-10/100 optical card has two available optical ports, common and bypass, that allow the card to
be "daisy chained" to other optical cards, such as FMB-X-2.5 cards. Common and bypass ports are
accessible either through notches in the front panel, via internal jumpers routed underneath the cards, or
from an adjacent optical access panel with fiber optic bushings.
The position of the EIB-10/100 card in the "optical chain" determines whether the bypass port is needed.
If the EIB-10/100 is at the end of the chain, the bypass port is not used. This is typically the case when
combined with CWDM-based FMBs. If the EIB-10/100 is not at the end of the optical chain, the common
port is attached to the upstream end (closer to the umbilical) and the bypass is connected to the
downstream end (further from the umbilical). This is typically the case when combining the EIB-10/100
with 1310/1550 nm FMBs.
Figure 6.2-2 shows the CWDM optical connections on the EIB-10/100 cards. Typical bypass loss is less
than 2.5 dB for wavelengths passed through the EIB-10/100 to other cards, such as FMB-X-2.5 cards.
When integrated with an FMB-X-2.5 card at the factory, optical jumpers are internally routed between the
FMB-X-2.5 and the EIB-10/100. When integrated with an FMB-X-2.5 in the field, optical jumpers may be
routed externally between the front panel bushings of the FMB-X-2.5 and an enclosed, standalone
version of the EIB-10/100.
Focal Technologies Corp.
Page 6-6
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