RAD DV-MUX3 Adaptive Multiplexer for Voice and Data

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DV-MUX3

RAD DV-MUX3 Adaptive Multiplexer for Voice and Data
 

FEATURES

  • Integrates voice/fax and data for transmission via a dial-up modem or a digital link

  • Adaptive bandwidth allocation optimizes bandwidth utilization

  • One or two compressed voice/fax channels plus one synchronous data channel

  • TDM, bit-interleaved for low delay

  • High quality MPMLQ voice compression at 4.8, 6.4, 7.2, 9.6 or 12.8 kbps

  • Automatic voice/fax detection

  • In-band fax support for Group III fax

  • Supports applications requiring double compression

  • Voice interfaces:

    • 2-wire FXS

    • 2-wire FXO

    • 2-wire/4-wire E&M

  • Integral support of DC current feed and ring generation for FXS interface

  • Link data rates from 9.6 to 256 kbps

  • Guaranteed bandwidth allocation for SNA traffic

  • Link interfaces:

    • V.24/RS-232

    • V.35

    • V.36/RS-449

    • RS-530

    • X.21

  • Configuration downloading to remote unit

  • Remote loopback, BER test, tone injection

  • Dial-up on demand function for PSTN applications

  • Automatic adjustment to fall-back data rate

DESCRIPTION

  • DV-MUX3 is an adaptive TDM Multiplexer, integrating one or two voice/fax channels together with one synchronous data channel onto a dial-up modem or digital link.

  • The voice channels provide high quality voice compression using the MPMLQ voice digitizing algorithm, at selectable rates of 4.8, 6.4, 7.2, 9.6 or 12.8 kbps. Toll quality voice reproduction (compatible to ADPCM at
    32 kbps) is guaranteed when using rates of 6.4, 7.2, 9.6 or 12.8 kbps.

  • Each compressed voice channel is available with one of the following interfaces (see Ordering):

    • 2-wire FXS for direct connection to a telephone set

    • 2-wire FXO for connection to a PABX extension line

    • 2-wire, 4-wire E&M interface.

  • In-band fax support is available for Group III fax machines and complies with T.4 and T.30 standards.

  • For applications requiring low delay, such as IBM SNA sessions, DV-MUX3 ensures that the minimal required bandwidth is always available, even in adaptive mode (see Figure 2).

  • The synchronous data channel operates at rates up to 252.8 kbps. The actual rate depends on the data rate of the main link, and on whether the operating mode is adaptive or non-adaptive. In the adaptive mode, the bandwidth is allocated to the voice and data channels dynamically, with the data channel receiving additional bandwidth when the voice channel is "idle" (telephone on-hook). In the non-adaptive mode, each channel is allocated a fixed bandwidth.

  • Each compressed voice channel is equipped with an integral echo canceller for canceling the near end hybrid echo. The module is also equipped with forward error correction for checking the most vital speech information bits (at 7.2 and 9.6 kbps), thus maintaining voice quality even at a channel bit error rate of 1 x 10-3.

  • Status indicator LEDs include: transmit and receive data (selectable for link, data or voice channels), sync loss, test and power. The LEDs also provide configuration error indication.

  • Diagnostics include remote loopback for each channel, BER test for data channel and tone injection for the voice channels.

  • The dial-up mechanism for PSTN applications activates the DTR signal to the modem only if the voice channel is in the "off-hook" state, or if the DTR of the data channel is active.

  • Two DV-MUX3 units (1U high each) can fit side-by-side in a 19" rack.

  • DV-MUX3 works only opposite another DV-MUX3 unit (not compatible with DV-MUX or DV-MUX2).

SPECIFICATIONS?

DV-MUX3 Adaptive Multiplexer for Voice and Data

LINK

Data Rates

9.6, 12, 14.4, 16.8, 19.2, 21.6, 24, 26.4, 28.8, 32, 38.4, 48, 56, 64, 128, 192 or 256 kbps

Timing

Externally clocked

Interface

V.24/RS-232, V.35, V.36/RS-449, RS-530, X.21, strap-selectable,

DTE

Connector

Built-in:

- X.21 interface: 15-pin D-type female

Via an adapter cable:

- V.35 interface: 34-pin female
- V.36 interface: 37-pin female
- RS-530 interface: 25-pin female
- V.24/RS-232 interface: 25-pin female

DATA CHANNEL

Data Rate

Up to 252.8 kbps

Timing

Derived from the link clock

Interface

V.24/RS-232, V.35, V.36/RS-449, RS-530, X.21, strap-selectable, DCE

Connector

Same as for LINK connector

VOICE/FAX CHANNEL

Number of Channels

1 or 2 (see Ordering)

Encoding

Standard G.723 MPMLQ at 4.8, 6.4, 7.2, 9.6 or 12.8 kbps, strap-selectable

End-to-End Delay

120 ms

Level Adjustment

Transmit:+2 dBm to -13 dBm
Receive: +2 dBm to -13 dBm (FXS, E&M)
+1 dBm to -13 dBm (FXO)

Strap selectable in 1 dB steps

Signal to Total Distortion

At 9.6 kbps (G.712, G.713 method 2):

- 0 to -30 dBm0: better than 33 dB
- +3 to -45 dBm0: better than 22 dB

Idle Channel Noise

Better than -70 dBm0

Connector

RJ-45 per channel

Fax Standard

Supports Group III fax machines, complies with T.4 and T.30.

Fax Data Rates / Channel

Bandwidth

2.4 kbps / 4.8 kbps

4.8 kbps / 6.4, 7.2 kbps

7.2 kbps / 9.6 kbps

9.6 kbps / 12.8 kbps

all with auto-fallback

FXS Interface

Standard: EIA RS-464 Loop Start

Impedance: nominal 600W
Feed current: 25 mA at 300W loop resistance
Return loss: (300 to 3400 Hz) better than 20 dB
Ringer (45 VRMS (?10%) overload protected 22 Hz (?10%)):

1 second ON, 3 seconds OFF

FXO Interface

Standard: EIA RS-464 Loop Start Off-hook

DC impedance:

150W at 100 mA feed
330W at 25 mA feed

AC input impedance: 600W
Return loss: better than 22 dB

On-hook

DC impedance: >1 MW
AC impedance: 20 kW (at 20 Hz, 70 VRMS)
Ring detect range: > 20 VRMS: 17 to 25 Hz

E&M Interface

2 or 4-wire (strap-selectable)

Standards (strap-selectable):

EIA RS-464 Type 1
EIA RS-464 Types II, III and V*
British Telecom SSDC5*
Impedance: nominal 600W
* with -24V in place of -48V

GENERAL

Power

100, 115/230 VAC (?10%)
48 VDC (>?10%) 47-63 Hz, 15 VA

Physical

Height: 4.4 cm / 1.7 in (1U)
Width: 19.3 cm / 7.6 in
Depth: 24.0 cm / 9.4 in
Weight: 2.7 kg / 6.0 lb

Environment

Temperature: 0-45?C / 32-104?F
Humidity: up to 90%, non-condensing

ORDERING

DVMUX3-FXO-CARD
DVMUX3-FXS-CARD
DVMUX3/2V/115/E/3524
DVMUX3/2V/115/E/V24
DVMUX3/2V/115/E/V35
DVMUX3/2V/115/O/3524
DVMUX3/2V/115/O/530
DVMUX3/2V/115/O/V24
DVMUX3/2V/115/O/V35
DVMUX3/2V/115/S/3524
DVMUX3/2V/115/S/530
DVMUX3/2V/115/S/V24
DVMUX3/2V/115/S/V35
DVMUX3/2V/115/X/3524
DVMUX3/2V/115/X/530
DVMUX3/2V/115/X/V24
DVMUX3/2V/115/X/V35
DVMUX3/2V/230/03524
DVMUX3/2V/230/E/3524
DVMUX3/2V/230/O/3524
DVMUX3/2V/230/O/V24
DVMUX3/2V/230/O/V35
DVMUX3/2V/230/O24530
DVMUX3/2V/230/S/V24
DVMUX3/2V/230/S/V35
DVMUX3/2V/230/S24530
DVMUX3/2V/230/S3524
DVMUX3/V/115/E/3524
DVMUX3/V/115/E/V24
DVMUX3/V/115/E/V35
DVMUX3/V/115/O/3524
DVMUX3/V/115/O/V24
DVMUX3/V/115/O/V35
DVMUX3/V/115/S/3524
DVMUX3/V/115/S/530
DVMUX3/V/115/S/V24
DVMUX3/V/115/S/V35
DVMUX3/V/230/E/V35
DVMUX3/V/230/O/2124
DVMUX3/V/230/O/V35
DVMUX3/V/230/S/2124
DVMUX3/V/230/S/530
DVMUX3/V/230/S/V35
DVMUX3/V/48/E/V24

APPLICATION

DV-MUX3 Application


Figure 1. Voice/Fax and LAN Traffic over High Speed WAN Link



 


Figure 2. Voice/Fax and SNA Session over Dial-Up Connection



 


Figure 3. Tandem Application for Remote to Remote Connectivity via Central PABX and Router



 


Figure 4. Single Leased Line for two Voice Calls and Data Traffic

 

 

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