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Glossary
GL-3
3162-A2-GB20-30
March 1999
Channel Service Unit. A device that connects service user equipment such as a DSU to
the local digital telephone loop, protects the line from damage, and regenerates the signal.
Control branch of the CSU menu tree.
Clear To Send. A signal indicating that the device is ready for the DTE to transmit data.
Usually occurs in response to Request To Send (RTS).
Customer 1 configuration area. The first of two sets of customer-defined configuration
options.
Customer 2 configuration area. The first of two sets of customer-defined configuration
options.
The transmission standard that specifies 12 frames as a superframe that is used for frame
synchronization and to locate signaling bits.
Connecting the COM port of one device to the AUX port of another device to provide
SNMP connectivity.
An organized compilation of computerized data.
A 15-position connector used on cables or devices.
A continuous frequency signal that can be modulated by another signal that contains
information to be transmitted.
Data Communications Equipment. The equipment that provides the functions required to
establish, maintain, and end a connection. It also provides the signal conversion required
for communication between the DTE and the network.
A factory-preset value that is assumed to be correct unless changed by the user.
Device Failure. A message that indicates that an internal failure has been detected by the
operating firmware. An 8-digit code appears for use by service personnel.
Device Health and Status branch of the CSU menu tree.
A mechanical, electrical, or electronic unit with a special purpose.
A signal composed of only two discrete values, representing the binary digits 0 and 1.
A thin, flexible magnetic disk enclosed in a protective jacket.
Download branch of the CSU menu tree.
DTE Loopback. Loopback mode that loops the information received on the DTE T1
network interface back to the network as close to the network interface as possible.
A process that transfers device firmware and software from a locally-attached PC to a
device, or allows the duplication of firmware and software from a local device to a remote
device.
An interconnection point for terminals, multiplexers, and transmission facilities. Individual
channels may be inserted into the aggregate stream or dropped out to accommodate
specific applications.
Digital signal level 0 (zero). A 64 kbps digital telecommunications signal or channel.
Digital signal level 1 (one). A digital signal transmitted at the rate of 1.544 Mbps in North
America.
Defines objects for managing E1 interfaces and supports the network and G.703 DTE
interfaces on the E1 NTU.
CSU
Ctrl branch
CTS
Cust1
Cust2
D4
daisy chaining
database
DB15 connector
data carrier
DCE
default
DevFail
DevHS branch
device
digital signal
diskette
DL branch
DLB
download
drop/insert
DS0
DS1
DS1/E1 MIB