COMSPHERE 3600 Series Data Service Units
Glossary-6 December 1996 3610-A2-GB46-60
filtering The 3600 Series DSU and hardware features present menus and selections based on features installed and
enabled. Filtering is not displaying options for hardware that is not installed.
flex The flex option is available for the Model 3610 with TDM or MCMP. When installed, each port can be set
independently as either an EIA-232 or V.35 interface.
framing A control procedure used with multiplexed digital channels where bits are inserted so the receiver can
identify time slots allocated to each subchannel.
front panel The front panel of a device that continuously provides status information about the device’s operation and
allows an operator to manage its operation. This is a generic term used for both the standalone and
carrier-mounted models.
full backup If the DSU/DBM detect a network failure, the DBM can automatically initiate dial backup and each
tributary communicates with the control DSU through a backup connection.
full-duplex The capability to transmit in two directions simultaneously.
Hz Hertz. A unit of frequency that equals one cycle per second.
IBF In-band framing. See bit robbing.
IEC InterExchange Carrier. A company that provides inter-LATA (local exchange carrier) telecommunication
services, like AT&T, MCI, and SPRINT. Access to these services can be provided through DDS dedicated
channels, T1.5 dedicated access channel, or digital switched access (DSA) channels.
IOC ISDN Ordering Code.
ISDN Integrated Services Digital Network. Provides capability to carry voice and data while sending signaling
on the D-channel.
ITU-TSS International Telecommunications Union Telecommunications Standardization Sector. An advisory
committee established by the United Nations to recommend communications standards and policies and
allocate transmission frequencies. Before March, 1993, it was called CCITT.
kbps Kilo (1,000) bits per second.
LADS Local Area Data Set is used to provide a point-to-point link between two devices (also called LDM).
LATA Local Area Transport Area. A region served by a local exchange carrier (LEC) that consists of one or
more area codes.
LCD Liquid Crystal Display. Thin glass plates containing liquid crystal material. When voltage is applied, the
amount of light able to pass through the glass plates is altered so that messages can be displayed.
LDM Limited-Distance Modem (also called a local area data set or LADS).
LEC Local Exchange Carrier. A company that provides intra-LATA (local exchange carrier)
telecommunication services, like NYNEX or Bell South.
LED Light Emitting Diode. A light or status indicator that glows in response to the presence of a certain
condition (e.g., an alarm).
link configuration Provides a communication path between point-to-point or multipoint units for compatibility with network
operations.
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