CITYLIGHT 10/100 ETHERNET TRANSCEIVER CARD
13
For these applications, an external 10dB attenuator is available to ensure that
the optical receive power falls within the operating limits of the receiver.
The fixed value 10dB attenuator, LCL505A, is of a doped-fiber design which
eliminates the troublesome reflections which an air-gap attenuator may introduce.
These reflections can upset the operation of lasers, particularly those used in high
data rate systems.
The 10dB attenuator may be deployed anywhere in the single-mode fiber link but it
is recommended that it be deployed at the receive end (rather than the transmit
end) of any particular point-to-point link.
The attenuator has a female connector at one end and a male connector at the
other end. The connector style should be specified at the time of ordering.
2.6 Ergonomics
The CityLIGHT 10/100 Ethernet Transceiver is able to be installed in any of the
CityLIGHT chassis including the 1U Chassis and 2-Card Chassis as well as the 3U
Chassis.
2.7 Power Supply
The CityLIGHT 10/100 Ethernet Transceiver receives all its power from the PSUs
mounted in the CityLIGHT Chassis. All chassis can support AC and 48V DC PSUs
in single and redundant forms. (See the CityLIGHT 1U or 3U Chassis or
CityLIGHT 2-Card Chassis as applicable for details).
2.8 Link Loss Forwarding
To allow fiber link failures to be passed to the copper interface, a link loss
forwarding feature is provided.
This is enabled by setting switch 4 to ON, and is disabled when switch 4 is OFF; see
Section 5, Switch Positions.
When enabled failures on the fiber link are passed to the copper port; they can be
seen by the device attached to the copper port as a link failure. Consequently the
fiber link must be good before the copper link is established.
When disabled, each of the fiber and copper links are established independently.
