Cisco 10008 Hardware Installation Manual page 154

Glossary
See CLI.
Command Line
Interface
Data terminal equipment (DTE) through which commands are entered into a host.
Console
An alarm condition that might affect most or all subscribers that connect to the reporting node. To
Critical alarm
obtain more information about a problem, use the
show facility-alarm status command. See also
D
See DTE.
Data terminal
equipment
Data circuit-terminating equipment (ITU-T expansion). Devices and connections of a communications
DCE
network that comprise the network end of the user-to-network interface. The DCE provides a physical
connection to the network, forwards traffic, and provides a clocking signal used to synchronize data
transmission between DCE and DTE devices. Modems and interface cards are examples of DCE.
Compare with DTE.
Dynamic random access memory. RAM that stores information in capacitors that must be periodically
DRAM
refreshed. Delays can occur because DRAMs are inaccessible to the processor when refreshing their
contents. However, DRAMs are less complex and have greater capacity than SRAMs. See also SRAM.
Digital signal level 0. Framing specification used in transmitting digital signals over a single channel
DS0
at 64 kbps on a T1 facility. Compare with
Digital signal level 1. Framing specification used in transmitting digital signals at 1.544 Mbps on a T1
DS1
facility (in the United States) or at 2.108 Mbps on an E1 facility (in Europe). Compare with
DS3.
Digital signal level 3. Framing specification used for transmitting digital signals at 44.736 Mbps on a
DS3
T3 facility. Compare with
Data Service Unit. Device used in digital transmission that adapts the physical interface on a DTE
DSU
device to a transmission facility such as T1 or E1. The DSU is also responsible for such functions as
signal timing. Often used with CSU, as in CSU/DSU.
Data terminal equipment. Device at the user end of a user-network interface that serves as a data source,
DTE
destination, or both. DTE connects to a data network through a DCE device (for example, a modem)
and typically uses clocking signals generated by the DCE. DTE includes devices such as computers,
protocol translators, and multiplexers.
See DRAM.
Dynamic random
access memory
E
Wide-area digital transmission scheme used predominantly in Europe that carries data at a rate of 2.048
E1
Mbps. E1 lines can be leased for private use from common carriers. Compare with T1; see also DS1.
Cisco 10008 Router Hardware Installation Guide
GL-4
Major alarm
DS1 and DS3.
DS0 and DS1.
and Minor alarm.
DS0 and
OL-0659-13