Yeastar S2 Module


Telephony Modules and Expansion Boards

Yeastarย P-Series PBX Systemย andย S-Series VoIP PBXย provide flexible telephony interfaces combination while allowing for future scalability with unique modular design. Besides the built-in rich SIP capabilities, you can decide what types of extensions and physical trunks you need in your telephone system. When your business expands, more uses and concurrent calls can also be added easily to meet growing business needs.



Add Telephony Modules

All the telephony interfaces are modular and customizable, whether itโ€™s FXS, FXO, ISDN BRI/PRI, or GSM/3G/4G.
S100, S300, P560, P570 require the combination of the Expansion Board and Telephony Modules to add interfaces.

  • S20 has 2 onboard module slots.
  • S50, S412, and P550 have 4 module slots.
  • P560 allows 1 Expansion Board.
  • S100 and P570 support 2 Expansion Boards.
  • S300 supports 3 Expansion Boards.

EX08 has 4 onboard module slots and 8 interfaces on the panel.
Supported Model: S100, S300, P560, P570

EX30 has 1 onboard E1/T1/PRI port.
Supported Model: S100, S300, P560, P570

Expand System Capacity

D30 Module

Add 100 VoIP Users & 30 Concurrent Calls
Supported Model: S100, S300, P560, P570

Yeastar S2 module is a module with 2 FXS ports to terminate two analog telephone or fax machines. It is
compatible with Yeastar S-Series VoIP PBX.


Port 2 RJ11 FXS Ports
Supported Model S412, S20, S50, S100, S300
Ring Frequency 25 Hz
Ring Load 840 Ohm
Loop Impedance 2000 Ohm
Loop Current 20 mA
Off-hook Voltage 11V
Ring Voltage 85V
On-hook Voltage (tip/ring) 48V
Off-hook Current 10 mA
Terminating Impedance Option 600 Ohm
Max Length Supported 1500M
ย Pulse Dial Speed 100~135 ms/ 10pps
ย Surge Voltage ย 1.5KV (10/70uS)
REN Load (1000M) 5REN=1400 Ohm
3REN=2330 Ohm
1REN=7000 Ohm



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