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2 Port T1/E1/PRI + 4 Port FXS PSTN Simulator
Part number CH-4FXS-MOD-2PRI (Basic Feature Set)
CH-4FXS-MOD-2PRI-A (Advanced Feature Set)
Basic Feature Set Advanced Feature Set
$2400 + S&H

$2600 + S&H

2 Port T1/E1/PRI + 4 Port FXS PSTN Simulator
  • Overview
  • Specificatons
  • Software
  • User Manual
  • Warranty
  • How to buy
One of the most feature rich PSTN simulator on the market. Unit has 4 analog phone lines (FXS) making it a perfect tool for testing VoIP gateways, IVR, V.90 modems, RAS servers, audio conference bridges or anything that requires analog phone lines. 2 port T1/E1/PRI module provides non-blocking switching among FXS ports and any of T1/E1/PRI B-channels or Time slots.

Telephone line simulator acts like a "telephone company in a box" providing dialtone,
ring voltage and all advanced phone line features such Caller ID, Call Waiting,
Call Hold, Three Way Calling and many others.

No only it can precisely simulate those features, it allows user to change or customize most
of the call parameters such as call progress frequencies or voltage levels with a powerful Windows
based management software.

Telephone line simulator is perfect tool to demonstrate functionality of any CPE that require analog
phone line such as Fax machines or Fax Servers, V.90 modems, alarm systems, RAS servers, Voice mail servers.

Simulator is capable of simulating not only North American phone lines also several European standards
including British Telecom.

Powerful real time logging capability allows saving call progress events to a file and analyzing those
offline for troubleshooting.

T1/E1/PRI Features

PRI Switch Types
National ISDN (primary-ni)
5ESS (primary-5ess)
DMS-100 (primary-dms100)
NET5 (primary-net5)
Q.SIG (primary-qsig)

CAS Robbed Bit Signalling (T1)

CAS Loop-Start FXS
CAS Loop-Start FXO
CAS Ground-Start FXS
CAS Ground-Start FXO
CAS E&M Wink Start FGD
CAS E&M Wink Start FGB
CAS E&M Immediate Dial
CAS E&M Delay Dial


E1: CRC4, no-CRC4

Number of Ports
2 PRI (T1/E1/PRI) Ports

Interface type
PRI: RJ-45 8-pin modular connector

Numbering Options
User defined phone numbers

Programmable Line Parameters (T1/E1/PRI)
Linecode (AMI, B8ZS)
Framing (SF, ESF)
Line build-out

Special Features
Q.921/Q.931 traffic analyzer
Configurable Tx/Rx delays for T1/E1/PRI ports
Satellite Delays
Loopback mode for CSU/DSU testing

FXS Features

Number of Ports
4 FXS (Loop start)

Interface type
RJ-11/45 8-pin modular connector

Programmable Line Parameters (FXS)
Call Progress Tones freq. and levels
Call Progress Timeouts
Dial Tone & Stutter Dial Tone
Line Impedance
Polarity Reversal (Metering, Connect/Disconnect supervision)
Metering Tones
Network Delays
On/Off Flash Hook Timing
Ring Frequency & Cadence
Ringing Voltage
Loop Start
In/Out Amplification

Programmable Line Features (FXS)
DTMF Generation
Hot Line Ringdown
Phone Numbers
Pulse/Tone Detection

Line Impairments (Advanced Feature Set only)
Configurable Delays up to 500ms
Near Echo
White Noise (Gaussian)

Caller ID Features
Programmable Names (CID)
DTMF Caller ID
Support for International Caller ID standards

Message Waiting Indicator
FSK (V.23 or Bell 202)
Stutter Dialtone
Neon Lamp (90VDC)

CLASS Features
Automatic Callback
Automatic Recall
Call Forward
Call Waiting Tone & Operation
Three Way Calling

PBX Features
Hunt Group Operation
"Meet-me" conference calls
Music on Hold (MOH)

Other Line Features
Audio Line Monitoring
Hook Flash Recognition
Precise Call Progress Tones

Management Interface
Serial COM Port - DB9
"PSTN Manager" Win32 Application

Supplementary Services
DNIS, ANI support
Caller ID

Operating Environment
Windows 2000/XP
Note: PC only required for setup of required configuration

Dimensions: 5"L X 6"W X 2"H

( 12.7cm X 15.24cm X 5.08cm )

Weight: 1 lb ( 500g )

Power Requirement: 110V/220V

Storage: -40 to +40C
Operating: 0 to 40C
Humidity: Max 85%

Power Supply

Type: Wall mount, external
Input: 220V, 110V (US, Canada)
Output: 20V AC, 1A
2.5 mm jack
UL Certified

Virtual Console warrants the product to be free of defects in workmanship and materials for a period of 1 year.


Policies and Procedures For Refunds, Repairs and Exchanges
There are several ways to purchase this product:

  1. You can buy this product online with a credit card.   
  2. For US based companies please e-mail your NET30 PO to or fax it to 718-228-5437.
    In some cases we may ask you for credit references.
  3. For International companies please e-mail your PO to and we will provide you with a payment instructions.
    International Purchase Orders require pre-payment via Wire Transfer before product can be shipped.
If you wish to receive a formal quote:   

Shipping Policy || Return Policy || Warranty

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