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Bandwidth Equivalencies
Pipe Speed Number of DSOs Equivalent to European Equivalent
DSO 64 Kbps 1 DSO 64 kbps
DS1 1.544 Mbps 24 24 DSO none (E1=2.048, 32 DSOs)
DS3 44.736 Mbps 672 28 DS1 E3
OC3 155.52 Mbps 2,016 3 DS3 STM1
OC12 622.08 Mbps 8,064 4 OC3 STM-4
OC48 2.488 Gbps 32,256 4 OC12 STM-16
OC192 9.953 Gbps 129,024 4 OC48 STM-64
OC768 39.813 Gbps 516,096 4 OC192  

Converged Network A single network capable of carrying a mixture of voice (telephone), video (production and training), and application data.

IP Telephony A LAN (Local Area Network) based PBX implementing toll-grade voice quality. This is part of a converged network solution. [see VoIP]

MBps Mega byte per second

mbps mega bits per second
OC-XXX (Optical Carrier)
OC-1: 51.85 Mbps
OC-3: 155.52 Mbps
OC-12: 622.08 Mbps
OC-24: 1.244 Gbps
OC-48: 2.488 Gbps
OC-192: 9.952 Gbps

POTS Plain Old Telephone system

PRI Primary Rate Interchange. Digital telephone services using a T1 line split into 23 voice or B (bearer) channels, and 1 signalling or D channel. Also known as Channel Associated Signalling (CAS).

PSTN Public Switched Telephone Network, also known as your local telephone company.

SDH Synchronous Digital Hierarchy. International high-speed baseband digital transport standard specifying incrementally increasing data stream rates for movement across digital optical links. U.S. version is called Sonet.

SONET Synchronous Optical Network. North American high-speed baseband digital transport standard specifying incrementally increasing data stream rates for movement across digital optical links.

STM-1 Synchronous Transfer Mode at 155 Mbit/s

STM4 Synchronous Transfer Mode at 622 Mbit/s

T1 A digital link with a carrying capacity of 24 64 kbps channels totalling 1.544 mbps. Each channel is called a DS0. A T1 is also called a DS1. For telephone services, signalling is commaonly referred to as Common Channel Signalling (CCS).

T3 A digital link with a carrying capacity of 45 mbps. A T3, also called a DS3, contains 28 T1 circuits.

TDM Time Division Multiplexing. Commonly associated with T1 signalling where multiple channels are assigned specific slots based upon timing intervals.

VoIP Voice over IP. A WAN (Wide Area Network) or internet based solution for bypassing telephone company long distance services. [see IP Telephony]
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