LambdaDriver 400 & 800
ML46430, Rev. 07
October 2004
Glossary
ALS/APR
ALS/APR is a special algorithm-&-sensor mechanism that regularly
checks link integrity on the access
and
trunk (WDM) side. If either of the
links is broken (when for e.g., the fiberoptic cable on the access
or
trunk
side is disconnected), the LDx00 performs Automatic Laser Shutdown
(ALS/APR) on the WDM link. As a result, power is reduced to the safety
level. After the links are reestablished, the LDx00 automatically
reactivates the laser.
CWDM
A technology for multiplexing
widely
differing wavelengths on a single
optical fiber. The range of wavelengths is typically 1470 to 1610 nm and
the gap between the wavelengths are usually integral multiples of 20 nm.
DWDM
A technology for multiplexing
narrowly
spaced wavelengths on a single
optical fiber. The wavelengths are in the infrared range, typically about
1550 nm and differ from one another usually by integral multiples of 0.2
to 0.8 nm.
LIN
LIN
feature notifies Terminal Equipment of link failure by cutting off laser
power on the access side whenever no power is received from the WDM
side, and vice versa. Specifically, power at the transponder
WDM TX
port
is cut off when no power is received at the
ACCESS RX
port. Also, power
at the transponder
ACCESS TX
port is cut off when no power is received
at the
WDM RX
port. LIN is permanently enabled.
OA
A device that directly amplifies an optical signal without first converting it
into an electrical signal.
OADM
Optical multiplexing device that enables specific wavelengths to be added
to or dropped from a WDM link while passing all other wavelengths to the
next node on the link.
OSC (Service)
An optical supervisory channel for carrying management data between
two WDM nodes. The wavelength of the channel is different from those of
the WDM channels. The traffic in the OSC is multiplexed along with the
traffic in the WDM channels on the same physical fiber.
Transponder
Device for converting a wave of one specific wavelength into a wave of a
different wavelength.
Virtual Fiber
A virtual fiber is infrared light of a specific wavelength. In the LDx00, the
virtual fibers are selected in the 1550 nm region for maximum operating
distance through fiber.
207
