43
A p p e n d i x A
Acronyms
A
Ampere
ac
alternating current
ANSI
American National Standards Institute
B8ZS
bipolar with 8 zeroes substitution
b/s
bits per second
BRA
Basic Rate Access to ISDN
CAS
channel associated signaling
CCITT
International Telegraph and Telephone Consultative Committee
CCS
common channel signalling
CO
central office
CPE
customer premises equipment
CSU
channel services unit
dc
direct current
DCE
data circuit terminating equipment
DMM
digital multimeter
DS1
digital signal level 1 (1.544 Mb/s)
DSU
digital services unit
DTE
data terminal equipment
E1
digital signal, level 1, specified by ITU-T (2.048 Mb/s)
ESD
electrostatic discharge
ESF
extended superframe format for t1, comprising 24 frames in a superframe
ETSI
European Telecommunication Standards Institute
FCC
Federal Communications Commission
FDL
facility data link
FSK
frequency shift keying
ft
feet
Содержание MX250
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