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Glossary of Terms
DDF
DDN
DTMF
DF
DWDM
DXC
E
EB
EOW
ES
ESF
ESR
ETSI
F
FAS
FC
FCS
FDDI
FEAC
FEBE
FEC
FERF
Flags
G
GUI
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Digital Distribution
H
Frame
HDB3
Digital Data Network
Header
Dual Tone Multifre-
quency Signaling
The Don't fragment bit
carried in the flags field
HDLC
Dense Wave Division
Multiplexing
Digital Cross Connect
HEC
HO Path RAI
Error Block
HO PTE
Engineering Orderwire
Error Seconds
HO
Extended Superframe
HP-IB
Format
Errored Second Ratio
HP-PLM
European Telecommu-
nications Standards
HP-RDI
Institute
HP-REI
Frame Alignment
HP-TIM
Signal
Foreground Channel
HP-UNEQ
Frame Check sequence
Hz
Fiber Distributed Data
Interface
Far End Alarm Channel
I
Far End Block Error
ICMP
Forward Error Connec-
tion
IHL
Far End Receive Failure
An internet header field
carrying control flags.
IP
Graphical User Inter-
ISDN
face
High Density Bipolar 3
Control information at
the beginning of a
message, datagram or
block of data.
High-level Data Link
control protocol
(layer2)
Header Error Control
High Order Path
Remote Alarm Indica-
tion
High Order Path Termi-
nating Equipment
High Order
Hewlett-Packard Inter-
face Bus (IEEE 488)
High Path Payload
Label Mismatch
High Path Remote
Defect Indication
High Path Remote Error
Indication
High Path Trace Identi-
fier Mismatch
High Path Unequipped
Hertz (cycles per
second)
Internet Control
Message Protocol
The internet header
field. Internet header
length is the header
length measured in 32
bit words.
Internet Protocol
Integrated Services
Digital Network
335
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