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GL-2
Cisco ASR 1000 Series Aggregation Services Routers MIB Specifications Guide
OL-15161-06
DS0
Digital signal level 0. Framing specification used in transmitting digital signals at 64 Kbps.
Twenty-four DS0s equal one DS1.
DS1
Digital signal level 1. Framing specification used in transmitting digital signals at 1.544 Mbps on a T1
facility.
DS3
Digital signal level 3. Framing specification used for transmitting digital signals at 44.736 Mbps on a
T3 facility.
DWDM
Dense Wave Division Multiplexing
E
EHSA
Enhanced High System Availability.
EMS
Element Management System. An EMS manages a specific portion of the network. For example the
SunNet Manager, an SNMP management application, is used to manage SNMP manageable elements.
Element Managers may manage asynchronous lines, multiplexers, PABX's, proprietary systems or an
application.
Encapsulation
The wrapping of data in a particular protocol header. For example, Ethernet data is wrapped in a
specific Ethernet header before network transit. Also, when bridging dissimilar networks, the entire
frame from one network is simply placed in the header used by the data link layer protocol of the other
network.
F
FRU
Field Replaceable Unit. Term applied to the Cisco 6400 components that can be replaced in the field,
including the NLC, NSP, NRP, and PEM units, plus the blower fans.
Forwarding
Process of sending a frame toward its ultimate destination by way of an internetworking device.
Frame
Logical grouping of information sent as a data link layer unit over a transmission medium. Often refers
to the header and trailer, used for synchronization and error control, that surround the user data
contained in the unit. The terms cell, datagram, message, packet, and segment are also used to describe
logical information groupings at various layers of the OSI reference model and in various technology
circles.
G
Gb
gigabit
GBIC
Gigabit Interface Converter —An optical transceiver (transmitter and receiver) housed in a small (30
mm x 65 mm), hot-pluggable, subenclosure. A GBIC converts electric currents (digital highs and lows)
to optical signals and optical signals to digital electric currents.
Gbps
gigabits per second