700-0023-05-00 Rev. 1 © 2013 Cyan, Inc. – All Rights Reserved. Page 205
Appendix B: Acronyms and
Cyan Terminology
ACO Alarm Cut-Off
ADM Add/Drop Multiplexer
AID Access Identifier
AIS Alarm Indication Signal
ALS
Automatic Laser Shutdown — The ALS protocol is used to turn off the optical output power of
remote transmitters if an optical link is broken.
AMB
Air Management Board —
Cyan Air Management Boards are essential to proper cooling of the
shelf assembly. Air Management Boards must be installed over all unused slot openings to
prevent damage from overheating.
ARP Address Resolution Protocol
Attenuation
A loss in signal strength along an electrical or optical cable. In optical fibers, attenuation is the
reduction in signal strength. The higher the signal loss, the higher the attenuation. Attenuation is
caused by dispersion, absorption and light scattering. Attenuation is typically referenced in
decibels per length of medium in kilometers (dB/km).
AUI Attachment Unit Interface
AWG Arrayed Wavelength Grating
– or –
Array Wire Guide
– or –
American Wire Gauge
B-MAC
Backbone MAC address — B-MAC is an individual MAC address associated with a Provider
Instance Port and used in creating the MAC header of I-tagged frames transmitted across a
Provider Backbone Bridged Network.
B-VID
Backbone VLAN Identifier — B-VIDs are used in PBB-TE as part of the 3-tuple that identifies a
TESI path.
BE Bit Error
BER Bit Error Ratio
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