Nortel BCM 3.7, Manual, Page: 902 / 1004

902 D
N0008589 3.3
double density
Double density for station modules is a function of Business Communications Manager
3.0 and later software. This functionality uses the B2 portions of the line to provide an
additional 16 possible telephone connections on each MSC bus. Only station modules that
support this feature provide this access, including the ASM8, DSM16+ and the DSM32+
media bay modules. The Business Communications Manager has two double density
system settings. Partial Double Density (PDD) is the default system setup. This
configuration leaves Bus 06 and 07 with B1/B2 capability to support a legacy Companion
system. Full Double Density (FDD) provides 32 lines on all six module buses.
D-packet
A BRI T loop can be used in combination with a BRI S loop to provide D-packet service
for a point-of-sale terminal adapter (POSTA) or other D-packet device. D-packet service is
a 16 kbps data transmission service that uses the D-channel of an ISDN line. The T and S
loops must be on the same physical module.
DPNSS
Digital Private Network Signaling System (DPNSS) is a networking protocol that
provides access to Business Communications Manager features over multiple combined
networks. Corporate offices, separated geographically, can be linked over DPNSS to other
Business Communications Manager systems, bypassing the restrictions of the PSTNs to
which they may be connected. This allows connected Business Communications Manager
systems to function like a private network. DPNSS is available in International systems
only.
driver (device)
A program that allows a hardware peripheral, such as a network interface card, to
communicate with the Business Communications Manager base unit.
DRT
Delayed Ring Transfer to Prime (DRT) allows the system to transfer an unanswered call
on an external line to the prime telephone related to that line if the targeted telephone is
not answered within the configured number of rings. Configure this setting under Feature
settings, Delayed Ringer Transfer. (Services, Telephony Services, General Settings)
DTMF
Dual tone multifrequency (DTMF) provides two distinct telephone signaling tones used
for dialing.
Dynamic Host Configuration Protocol
See DHCP.