Terms And Definitions - Alcatel-Lucent 1665 Installation Manual

Glossary
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VT-G
Virtual Tributary Group
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W
WAN
Wide Area Network

Terms and definitions

0x1
See Ring (0x1) Low-Speed Interface.
1+1
The 1+1 protection switching architecture protects against failures of the optical transmit/receive
equipment and their connecting fiber facility. One bidirectional interface (two fibers plus associated
OLIUs on each end) is designated "service," and the other is designated "protection." In each
direction, identical signals are transmitted on the service and protection lines ("dual-fed"). The
receiving equipment monitors the incoming service and protection lines independently, and selects
traffic from one line (the "active" line) based on performance criteria and technician/OS control. In
1+1 both service and protection lines could be active at the same time (service in one direction,
protection in the other).
1xN, 1x1
1xN protection switching pertains to circuit pack protection that provides a redundant signal path
through the Alcatel-Lucent 1665 Data Multiplexer (Alcatel-Lucent 1665 DMX) (it does not cover
protection switching of an optical facility; se "1+1"). In 1xN switching, a group of N service circuit
packs share a single spare protection circuit pack. 1x1 is a special case of 1xN, with N=1. In 1x1
only one is active at a time.
1GE
Gigabit Ethernet - 1.250 Gbps line rate.
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A
Active
Active identifies a 1+1 protected OC-N line which is currently selected by the receiver at either end
as the payload carrying signal or a 1x1 or 1xN protected circuit pack that is currently carrying
service. (See Standby).
AGNE - Alarm Gateway Network Element
A defined NE in an alarm group through which members of the alarm group exchange information.
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Alcatel-Lucent 1665 DMX R9.0
365-372-304R9.0 Issue 2
July 2010
Terms and definitions
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