TC Communications TC8518 T1, Руководство пользователя, Страница: 99 / 108

TC8518 Rev 2.2 User Manual Glossary-1
Glossary
A
ALM
A front panel LED that indicates an alarm. See SNMP Query, on page 5-1.
B
Bandwidth
A range of frequencies available for signaling; the differences between the
highest and lowest frequencies of a band are expressed in (Hz).
Bridge
A device used to connect two separate LANs or used to divide a large LAN into
smaller LANs. Each LAN acts as its own LAN, but uses a bridge device to
communicate from one LAN to another.
Bus
Path or channel, usually electrical, with one or more conductors, where all
devices are able to receive all transmissions at the same time.
C
Counter-
Rotating Ring
Aka. Self-Healing Ring; has two physical transmission lines or rings with
transmitting and receiving signals in each ring traveling in opposite directions. If
the line or a device along the ring fails, the ring re-anneals by bypassing the
device and or line and forms with the other ring to form a new single ring.
D
DCE
Acronym for Data Communication Equipment, aka. Data Circuit-Terminating
Equipment.
DCAR
Acronym for
Dry Contact Alarm Relay
DTE
Acronym for Data Terminating or Data Terminal Equipment.
DTR
Acronym for Data Terminal Ready.