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Glossary 299
Installation and Maintenance Guide
disconnect supervision
A feature that enables the system to detect if an external caller hangs up. Enable
Disconnect Supervision under Trunk/Line data in Lines programming.
disk mirroring
The Business Communications Manager supports the RAID 1 disk mirroring protocol,
which creates an exact data duplicate of the system hard disk on a second, co-located hard
disk within the BCM1000. If one of the hard disks becomes inoperable, the system halts
the mirroring process and boots from the unaffected hard disk. You can then schedule disk
replacement during normal maintenance periods. This does not replace your BRU backup
disks, which should still be run on a regular schedule and be kept off-site.
Do Not Disturb
A feature that stops calls from ringing at a telephone. Only Priority Calls ring at the
telephone when this feature is set. A line button flashes when a call is received, but the set
does not ring.
domain name
The domain name is used to translate Internet IP addresses into common language to allow
for easier user access.
Domain Name Server (DNS)
The domain name system or server is the system that maps names of objects into IP
numbers or other resource record values.
dual tone multifrequency (DTMF)
Two distinct telephone signaling tones used for dialing.
dynamic IP address
This feature is provided by an IP address server which assigns an IP address to a computer
every time it logs on to the network.
Emergency 911 dialing
The ability to access a public emergency response system by dialing the digits
9-1-1.
emergency telephone
A single-line telephone that becomes active when there is no power to the Business
Communications Manager. This telephone is also referred to as a 500/2500 telephone.
Ethernet
A local area network that networks computers with coaxial cable or twisted pair wiring.
This protocol makes use of Carrier Sense Multiple Access/Collision Detect (CSMA/CD)
LAN to allow computers, such as the Business Communications Manager to listen for
pauses before they communicate.