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G L O S S A R Y
G L - 1 7
365-372-334 R2.0
Issue 4, November 2004
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Terms and Definitions
Numerics
0x1
Set up using unswitched cross connections on UPSR Ring Interfaces.
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).
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.
AIS - Alarm Indication Signal
A code transmitted downstream in a digital network that shows that an
upstream failure has been detected and alarmed.
AMI - Alternate Mark Inversion
A line code that employs a ternary signal to convey binary digits, in which
successive binary ones are represented by signal elements that are normally
of alternating, positive and negative polarity but equal in amplitude, and in
which binary zeros are represented by signal elements that have zero
amplitude.
ASCII - American Standard Code for Information Interchange
A standard 8-bit code used for exchanging information among data
processing systems and associated equipment.
Summary of Contents for Metropolis DMXplore
Page 8: ... C O N T E N T S v i i i 365 372 334 R2 0 Issue 4 November 2004 ...
Page 16: ... T A B L E S x v i 365 372 334 R2 0 Issue 4 Novmeber 2004 Glossary ...
Page 286: ... Backplane Pin Replacement Replacement Methods D 1 0 365 372 334 R2 0 Issue 4 November 2004 ...
Page 292: ... Installation Checklist Overview E 6 365 372 334 R2 0 Issue 4 November 2004 ...
Page 326: ... G L O S S A R Y G L 3 0 365 372 334 R2 0 Issue 4 November 2004 ...
