ZyXEL Communications Multi-service Access Platform MSAP2000 - Manual (Page 236)

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) 900
Ω Nominal
600
Ω 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 1200
Ω
(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)