Table of Contents
Advertisement
Terms and definitions
............................................................................................................................................................................................................................................................
Digital Multiplexer
Equipment that combines time-division multiplexing several digital signals into a single composite
digital signal.
DRI - Dual Ring Interworking
Two ring networks interconnected at two common nodes.
Drop and Continue
A technique that allows redundant signal appearances at two central offices in a DRI network,
allowing protection against central office failures.
DS1
Digital Signal Level 1 (1.544 Mb/s).
DS1(28) Circuit Pack
The DS1(28) circuit pack interfaces to the DSX-1 panel.
DS3
Digital Signal Level 3 (44.736 Mb/s).
DS3/EC-1 Circuit Pack
The DS3/EC-1 circuit pack interfaces to the DSX-3 panel.
DSn - Digital Signal Rate n
One of the possible digital signal rates at Alcatel-Lucent 1850 TSS-60 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 Alcatel-Lucent 1850 TSS-60s 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.
............................................................................................................................................................................................................................................................
365-372-603R2.0
Issue 1 January 2009
G L- 1 9
Advertisement
Table of Contents
