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Dialogic VFX/41JCT-LS Media Boards
Field proven, high performance, 4 port media processing for media and advanced fax processing

Dialogic VFX/41JCT-LS Media Boards

Dialogic Products
JCT Media Boards
Dialogic VFX/41JCT-LSEW 4-port Analog Media Board, Loop-Start, PCIe
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The Dialogic VFX/41JCT-LS Media Board is a 4-port analog converged communications board that supports voice, fax, and software-based speech recognition processing in a single PCI Express slot, providing four (4) analog telephone interface circuits for direct connection to analog loop start lines.

Dialogic JCT Media Boards – including this model - can be used by developers to provide small- and medium-sized enterprise Computer Telephony (CT) applications that require high-performance voice and fax processing. Among the features and benefits of this model, and other Dialogic JCT Media Boards, are the following. They use Digital Signal Processor (DSP) voice processing technology, making them wellsuited for server-based CT systems under Windows and Linux. They also provide a powerful platform for creating sophisticated Interactive Voice Response (IVR) applications for the small and medium-sized enterprise market segments. Their Caller ID support lets applications, such as IVR, receive calling party information via a telephone trunk line; Caller ID is supported for North America (CLASS protocol), the United Kingdom (CLI protocol), and in Japan (CLIP protocol). Features such as fax and software-based speech recognition processing enable unified messaging applications. They also provide Automatic Gain Control (AGC), so even a weak telephone signal can be recorded and replayed with clarity.

Features and Benefits:

Features Benefits
Supports up to four (4) channels of enhanced on-board fax Reduces the number of boards per system
Supports Continuous Speech Processing (CSP) Provides a flexible speech processing technology, which, when coupled with efficient drivers, off-loads critical real-time signal processing in speech-enabled applications to on-board DSPs. Reduces system latency, increases recognition accuracy, and improves overall system response time for high-density speech solutions.
Available in PCI Express form factor PCI Express form factor compatible with x1 lane configuration or higher
A-law or µ-law voice coding at dynamically selectable data rates, 24 kbit/s to 64 kbit/s, selectable on a channel-by-channel basis Allows for a beneficial tradeoff between disk storage and voice quality
Telcordia CLASS, UK CLI, Japanese Caller ID, and other international protocols Supports international Caller ID capability via on-hook audio path
Advanced outbound call progress analysis Monitors outgoing call status quickly and accurately


Technical Specifications
Number of ports 4
Maximum boards per system 8
CT Bus loads per board 1
Maximum CT Bus loads per system 20
Digital network interface 4 on-board loop start interface circuits
Resource sharing bus CT Bus
Control microprocessors 80C186 @ 34.8 MHz
Digital signal processor Freescale DSP56303 @ 100 MHz, with 128Kx24 private SRAM
Supported operating systems Windows; Linux
Signaling Analog loop start
Host Interface
Bus compatibility Complies with PCI-SIG PCI Express Base Specification, Rev. 1.1; x1 or higher compatible
Shared memory 32 KB page
Interrupt Legacy INTA emulation shared by Dialogic JCT PCIe Media Boards
Physical Dimensions
Dimensions Standard-height, full-length form factor
12.3 in. (31.24 cm) long without edge retainer, or 13.3 in. (33.78 cm) long with edge retainer
0.79 in. (2 cm) wide (total envelope)
3.87 in. (9.83 cm) high (excluding edge connector)
Power Requirements
+12 VDC 450 mA maximum
Environmental Requirements
Operating temperature +32°F (0°C) to +122°F (+50°C)
Storage temperature -4°F (–20°C) to 158°F (+70°C)
Humidity 8% to 80% noncondensing
Telephone Interface
Trunk type Loop start
Impedance 600 Ohms nominal
Ring detection 15 Vrms minimum, 13 Hz to 68 Hz, (each configurable by parameter*)
Loop current range 20 mA to 120 mA
Echo return loss Configurable by software parameter
Crosstalk coupling Less than –70 dB at 1 kHz channel to channel
Receive signal/noise ratio 70 dB referenced to –15 dBm
Frequency response 200 Hz to 3400 Hz ±3 dB (transmit and receive)
Connector 4 RJ-11 type
Estimated MTBF
  • Per Telcordia Method 1
  • 230,000 hours
Springware/JCT Technical Specifications
Fax compatibility
  • ITU-T G3 compliant (T.4, T.30)
  • ETSI NET/30 compliant
Data rate
  • 14.4 kbit/s (v.17) send
  • 9.6 kbit/s (v.29) receive
Variable speed selection Automatic step-down to 12,000 bit/s, 9600 bit/s, and lower
Transmit data modes
  • API-selectable Modified Huffman (MH)
  • Modified Read (MR)
  • Modified Modified Read (MMR) with Error Correction Mode (ECM)
Receive data modes API-selectable MH, MR, and MMR with ECM
File data formats Tagged Image File Format-Fax (TIFF-F) for transmit/receive MH, MMR, and ASCII text transmit
ASCII-to-fax conversion
  • Host-PC-based conversion
  • Direct transmission of text files
  • Windows fonts supported
  • Page headers generated automatically
Error correction Detection, reporting, and correction of faulty scan lines
Image widths
  • 1728 pixels
  • 2048 pixels
  • 2432 pixels
Image scaling Automatic horizontal and vertical scaling between page sizes
Polling modes
  • Normal
  • Turnaround
Image resolution
  • Normal (203 pels/in. x 98 lines/in.; 203 pels/2.54 cm x 98 lines/2.54 cm)
  • Fine (203 pels/in. x 196 lines/in.; 203 pels/2.54 cm x 196 lines/2.54 cm)
Fill minimization Automatic fill bit insertion and stripping
Audio Signal
Receive range –40 dBm to +2.5 dBm0 nominal, configurable by parameter*
Automatic gain contro
  • Application can enable/disable
  • Above –18 dBm0 results in full-scale recording, configurable by parameter*
Silence detection –40 dBm nominal, software adjustable*
Transmit level (weighted average) –9.5 dBm nominal, configurable by parameter*
Transmit volume control 40 dB adjustment range, with application-definable increments, capped according to country-specific regulations
Frequency Response
24 kbit/s 300 Hz to 2600 Hz ±3 dB
32 kbit/s 300 Hz to 3400 Hz ±3 dB
48 kbit/s 300 Hz to 2600 Hz ±3 dB
64 kbit/s 300 Hz to 3400 Hz ±3 dB
Audio Digitizing
13 kbit/s GSM 6.10 @ 8 kHz sampling
24 kbit/s 4-bit OKI ADPCM @ 6 kHz sampling
32 kbit/s 4-bit OKI ADPCM @ 8 kHz sampling
G.726 @ 8 kHz sampling
48 kbit/s G.711 µ-law PCM @ 6 kHz sampling
64 kbit/s G.711 µ-law PCM @ 8 kHz sampling
Digitization selection Selectable by application on function call-by-call basis
Playback speed control
  • Pitch controlled
  • Available for 24 kbit/s and 32 kbit/s data rates
  • Adjustment range: ±50%
  • Adjustable through application or programmable DTMF control
DTMF Tone Detection
DTMF digits 0 to 9, *, #, A, B, C, D per Telcordia LSSGR Sec 6
Dynamic range –38 dBm0 to –3 dBm0 per tone, configurable by parameter*
Minimum tone duration 40 ms, can be increased with software configuration
Interdigit timing
  • Detects like digits with a >40 ms interdigit delay
  • Detects different digits with a 0 ms interdigit delay
Acceptable twist and frequency variation Meets Telcordia LSSGR Sec 6 and EIA 464 requirements
Noise tolerance Meets Telcordia LSSGR Sec 6 and EIA 464 requirements for Gaussian, impulse, and power line noise tolerance
Cut-through Local echo cancellation permits 100% detection with a >4.5 dB return loss line
  • Detects less than 20 digits while monitoring Telcordia TR-TSY-000763 standard speech tapes (LSSGR requirements specify detecting no more than 470 total digits)
  • Detects 0 digits while monitoring MITEL speech tape #CM 7291
Global Tone Detection
Tone type Programmable for single or dual
Maximum number of tones Application-dependent
Frequency range Programmable within 300 Hz to 3500 Hz
Maximum frequency deviation Programmable in 5 Hz increments
Frequency resolution ±5 Hz. Separation of dual frequency tones is limited to 62.5 Hz at a signal-to-noise ratio of 20 dB
Timing Programmable cadence qualifier, in 10 ms increments
Dynamic range Programmable, default set at –6 dBm0 to –3 dBm0 per tone
Global Tone Generation
Tone type Generate single or dual tones
Frequency range Programmable within 200 Hz to 4000 Hz
Frequency resolution 1 Hz
Duration 10 ms increments
Amplitude Programmable within –43 dBm to –3 dBm per tone
MF Signaling
MF digits 0 to 9, KP, ST, ST1, ST2, ST3 per Telcordia LSSGR Sec 6, TR-NWT-000506 and ITU-T Q.321
Transmit level Complies with Telcordia LSSGR Sec 6, TR-NWT-000506
Signaling mechanism Complies with Telcordia LSSGR Sec 6, TR-NWT-000506
Dynamic range for detection –25 dBm0 to –3 dBm0 per tone
Acceptable twist 6 dB
Acceptable frequency variation Less than ±1 Hz
Call Progress Analysis
Call Progress Analysis
  • Busy tone detection
  • Ring back tone detection
  • Positive voice detection
  • Positive answering machine detection
  • Fax/modem detection
  • Intercept detection
  • Dial tone detection before dialing
Tone Dialing
DTMF digits 0 to 9, *, #, A, B, C, D per Telcordia LSSGR Sec 6, TR-NWT-000506
Frequency variation Less than ±1 Hz
Rate 10 digits/s, configurable by parameter*
Level –4.0 dBm per tone, nominal, configurable by parameter*
Pulse Dialing
10 digits 0 to 9
Pulsing rate
  • 10 pulses/s, nominal
  • 20 pulses/s for Japan, configurable by parameter*
Break ratio 60% nominal, configurable by parameter*
Analog Caller Identification
Applicable standards
  • Telcordia TR-NWT-000030
  • Telcordia TR-NWT-000031
  • Telcordia TR-NWT-001188
  • TAS T5 PSTN1 ACLIP: 1994 (Singapore)
Modem standard Bell 202 or V.23, serial 1200 bits/sec (simplex FSK signaling)
Receive sensitivity –48 dBm (–50 dBv) to –1 dBm
Noise tolerance Minimum 18 dB SNR over 0 to –48 dBm dynamic range
Data formats Single Data Message (SDM) and Multiple Data Message (MDM) formats via API calls and commands
Line impedance AC coupled 600 Ohm (@ 1.8 kHz) termination during Caller ID on-hook detection interval
Message formats ASCII or binary SDM, MDM message content
Analog Display Services Interface (ADSI)
Analog Display Services Interface (ADSI)
  • FSK generation per Telcordia TR-NWT-000030
  • CAS tone generation and DTMF detection per Telcordia TR-NWT-001273

* Analog levels: 0 dBm0 corresponds to a level of +3 dBm at tip-ring analog point. Values vary depending on country requirements; contact your account manager


Download the Dialogic VFX/41JCT-LS Media Boards Datasheet (.PDF)


Dialogic Products
JCT Media Boards
Dialogic VFX/41JCT-LSEW 4-port Analog Media Board, Loop-Start, PCIe
Get a Quote!