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11. System Parameter Specification

MSAP2000 Technical Manual V3.0 11-7

11.5. POTS

Parameter FXO(COT POTS) FXS (RT POTS)

Subscriber Phone

Signaling format

Dial Pulse (DP) and Dual Tone Multiple

Frequency (DTMF)

Signaling Transmission

Format

Channel Associated Signaling (CAS) or

Common Channel Signaling (CCS)

Caller ID Display (See

“Note” below)

DTMF and FSK

Impedance (balanced) 900Ω Nominal 600Ω Nominal

Line Code ITU-T G.711 A-law

Subscriber-end (RT)

Ring Format

220Hz, 60 Vrms (±10V).

One second on, two seconds off

(configurable)

Polarity Reversal Polarity Guard Polarity Reversal

Detection

Minimum startup

voltage required for RT

≥20mA. The DC loop

resistance is 1200Ω

(including internal

phone resistance)

Voice Mailbox Complies with Chunghwa Telecom’s ME

7230-2: System Specifications for

Telephone Voice Mailboxes

Messaging Services Transparently transmits the messages

between Exchange Servers and

Telephones

Standard

Specification

(Table 11-A)

Note: Supports CENTREX, caller ID, and complies with CHT

ME2420-2: Specification for Caller ID Frequency Shift Keying (FSK)

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