AMI
ANI
Asynchronous Data
B8ZS
B Channel
Bearer Channel
Behind the PBX
Bell Labs
Bellcore
BERT
Billing Telephone
     Number
Bit Error Rate Test
Bit Rate
Blocking
Both Way Trunks
BRI
BRITE
BTN
Business Office
Called Party Address
CCIS
Central Office
Channel
Choke Exchange
Circuit
Circuit Switched Data
Circuit Switching
CLASS
CLEC
CLID
CO
Codec
Combination Trunk
Common Channel
    Interoffice Signaling
Competitive Local
    Exchange Carrier
Concentration
CPE
CSD
CSU
CSU/DSU
Custom ISDN
D4
D Channel
DCE
DDS
Dedicated Circuit
Dedicated Digital Service
DID
DID Extension or
    DID Station
DID Number
DID Trunk
Direct Inward Dialing
Directory Number
Directory 1&2
DNIS
DSL
DSU
DTE
DTMF
E1
ESF
ETS 300
Euro ISDN
Exchange
Extended Superframe
Four Wire
Frame
Glare
Grade of Service
Ground Start Trunk
HDB3
Hunt Group
Hybrid
IEC
ILEC
IMUX
In Band Signaling
Incumbent Local
    Exchange Carrier
Independent
Interconnect Company
Interexchange Carrier
Inverse Multiplexing
IOC Capability Packages
ISDN
ISDN Protocol
ISDN 2
ISDN 30
ISG
IXC
Kbps
Key Telephone System
LATA
LDN
LEC
Line
Line Card
Line Coding, T1
Line Format, T1
Listed Directory Number
Local Exchange Carrier
Local Access &
    Transport Area
Long Distance
Loop
Loop Qualification
Loop Start Line
Loop Start Trunk
Lucent Technologies
MSN
National ISDN
NCTE
Network Channel
    Terminating Equipment
NIUF
Nortel
Northern Telecom
NT1
PBX
PIC
PMP
POP
Port
POT
POTS
PRI
Provisioning
PS2 Power
PTP
RBOC
RD
Regional Bell Operating
    Company
Repeater
Robbed Bit Signaling
Rollover
S Interface
SØ
S2M
Sealing Current
SF
Silence Suppression
SLC-96
SLIC
SPID
Station Line
Statistical Multiplexing
Subscriber
Superframe
Switch
Switch Type
Switched Circuit
Switched-56
Synchronous Data
T-Link
T1
TA
Tandem Switch
Tandem Tie Trunk
   Switching
TD
Telco
Telco Setting
Telcordia
Telephone Number
Telos Customer Support
Telos Test Line
Terminal Adapter
Tie Line
Tie Trunk
Trouble Ticket
Trunk
Trunk Group
Two-way DID Trunk
Two Wire
U Interface
V.35
Variant
Virtual ISDN
Work Order
X.21