m-it-001-1

IGS-M-IT-001-1(0) Feb.2007

APPROVED

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IGSIranian Gas Standards

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Technical Specification for Small Capacity PABX , Part(1) : less than 100 extensions

Fax:(9821)-8131-56793345 67894: ;?;@A9 BC;A=3 D>E4F@G: 6HI? JC4KL 6M NOP ;?;@A9Q9 D3;R@A9 S94M

http://igs.nigc.ir/igs [email protected]

NIGC 2007 IGS-M-IT-001-1

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1- ITU-T: International Telecommunication Union-Telecommunication

(Series E & Q)

2- IEEE: Institute of Electrical and Electronic Engineering

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CAS: Channel-Associated Signaling

Co: Central office

DTMF: Dual-Tone Multi Frequency

E&M: reciEive and transMit

FSK: Frequently Shift Keying

FX: Foreign eXchange


LOM: List Of Material

LOP: List Of Price

Mbps: Mega bit per second

SOC: State Of Compliance

PABX: Private Automatic Branch eXchange

PCM: Pulse Code Modulation

PRI: Primary Rate Interface

TCI: Telecommunication Company of Iran

TDM: Time Division Multiplexing

UPS: Uninterruptible Power Supply

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