Glossary
Terms and Definitions
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G L - 2 1
Lucent Technologies - Proprietary
See notice on first page
365-372-327 R2.0
Issue 1, October 2003
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DSn - Digital Signal Rate n
One of the possible digital signal rates at Metropolis
®
DMXtend interfaces:
DS1 (1.544 Mb/s) or DS3 (44.736 Mb/s).
DSX - Digital Cross-Connect Panel
A panel designed to interconnect to equipment that operates at a designated
rate. For example, a DSX-3 interconnects equipment operating at the DS3 rate.
DTE - Data Terminating Equipment
That part of a data station that serves as a data source (originates data for
transmission), a data sink (accepts transmitted data), or both.
Dual Homing
A network topology in which two Metropolis
®
DMXtends serve as hosts
supporting up to 8 OC-3 rings or 4 OC-12 rings. Each OC-3 and OC-12 ring is
interconnected between the two separate hosts.
E
EC-1, EC-n - Electrical Carrier
The basic logical building block signal with a rate of 51.840 Mb/s for an EC-1
signal and a rate of n times 51.840 Mb/s for an EC-n signal. An EC-1 signal
can be built in two ways: A DS1 can be mapped into a VT1.5 signal and 28
VT1.5 signals multiplexed into an EC-1 (VT1.5 based EC-1), or a DS3 can be
mapped directly into an EC-1 (DS3 based EC-1).
ECI - Equipment Catalog Item
The bar code number on the faceplate of each circuit pack used by some
inventory systems.
ES - Errored Seconds
A performance monitoring parameter.
ESF - Extended Super Frame
The format for a DS1 signal.
F
FE - Far End
Any other network element in a maintenance subnetwork other than the one the
user is at or working on. Also called remote.
FE ACTY - Far End Activity
An LED on the SYSCTL circuit pack faceplate.
FEBE - Far End Block Error
An indication returned to the near-end transmitting node that an errored block
has been detected at the far end.