User's Manual
HT8000-I/HT8000-II/HT8000-VI
Appendix Terms and Abbreviations
Version 1.4(Oct.2019)
Beijing Huahuan Electronics Co., Ltd.
113
E
Electric
Supervisory
Channel (ESC)
ESC is a dedicated channel used to provide
supervisory communication between all nodes
within the optical transmission network. The ESC is
part of the overhead of the transmission frame,
transmitted together with the service signal.
M
Metropolitan
Area Network
MAN is capable of connecting multiple LANs to a
high-speed computer network covering the size of a
metropolitan area. Its coverage is between a LAN
and a WAN. MAN is regarded as a backbone
network which uses optical fibers as transmission
medium.
O
Optical
Transponder
Unit(OTU)
OTU refers to the device that converts the optical
wavelength signal of the UNI side into the
standard wavelength signal suitable for an open
WDM system.
Optical
Supervisory
Channel
（
OSC
）
OSC uses a specific wavelength as a dedicated
optical channel for supervisory communication
between different WDM nodes.
U
User
Network
Interface (UNI)
The interface between a user's device and a private
or public network device, such as an ATM switch.
