Glossary
GL-18 Issue 3 June 2000
SDH
Synchronous Digital Hierarchy
Self-Healing
Ring architecture in which two or more fibers are used to provide route diversity. Node failures only
affect traffic dropped at the failed node.
SEFS
Severely Errored Frame Seconds
SEO
Single-Ended Operations — The maintenance capability that provides remote access to all
DDM-2000 systems from a single location over the DCC.
Service Line
On a DDM-2000 FiberReach system, a service (or "working") line is a pair of fibers (one transmit
and one receive) that terminate on an OLIU circuit pack in the
main
slot. As defined by the SONET
standard, the SONET APS channel is not defined on a service (or "working") line. (See Protection
Line.)
SES
Severely Errored Seconds — This performance monitoring parameter is a second in which a signal
failure occurs, or more than a preset amount of coding violations (dependent on the type of signal)
occurs.
SF
Super Frame (format for DS1 signal)
Shelf ID
A switch settable parameter with values of from 1 to 8. Used to log into a selected shelf in a bay
using the CIT.
SID
System Identification
Single 0x1 Cross-Connection
In a dual-homed application, the DDM-2000 OC-3/OC-12 Multiplexer uses a single 0x1 cross-con-
nection to map the VT1.5 channels between the DDM-2000 FiberReach OC-1 and the DDM-2000
OC-3/OC-12 rings. This single 0x1 architecture maps low speed to high speed on a specified ring
rotation. The high speed to low speed drop is made on the same specified ring with no path switch-
ing. Protection is provided at the VT1.5 end points. See Dual 0x1.
Single Homing
In DDM-2000 FiberReach, a network topology in which a single OC-3 shelf serves as a DDM-2000
FiberReach Multiplexer host supporting up to six OC-1 rings. A
SLC
-2000 Access System serving
as a host can support up to two OC-1 rings. See Dual Homing.
Site ID
A switch settable parameter with values of from 1 to 8. Displayed on SYSCTL circuit pack to indicate
to which site the user panel alarms and LEDs apply.
SLIM
Subscriber Loop Interface Module
SM
Single Mode
To Next Page
Loading...
Need help?
General
