DTX-600   by ECI Telecom

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The DTX family of products produced by ECI Telecom, Israel, are known as Digital Circuit Multiplication Equipment or DCME.

The DTX-600 is capable of accepting up to 480 channels carrying combinations of voice, non-fax data, fax, 64 kbit/s and Native data traffic for transmission over a single 2 Mbit/s bearer (31 channels). The DTX-600 also supports multiple bearers to multiple international destinations.

The DTX-600 enables Telstra to maximise the effective use of its international transmission facilities by utilising compression techniques such as Digital Speech Interpolation (DSI), CS-ACELP (8 kbit/s voice encoding: ITU-T G729), Variable Bit Rate encoding (VBR), Fax compression, CCS7 data link compression and 'End to End' circuit compression

This is the first DCME product that enables carriers such as Telstra to actively manage and configure their entire network end-to-end from a central location by using the In Band Management feature of the DTX-600 product. All In Band Management is via the DTX-600 bearer/s using TCP/IP.

DTX-600 provides a toll quality compression ratio or gain of 16:1 (using mixed voice and data traffic).

DTX-360   by ECI Telecom

The DTX-360 DCME is capable of accepting up to 360 channels, carrying combinations of voice, non-fax data, fax and 64kbit/s traffic for transmission over a single 2 Mbit/s bearer (31 channels).

The DTX-360 enables Telstra to maximise the effective use of its international transmission facilities by utilising compression techniques such as Digital Speech Interpolation (DSI), LD-CELP (2 bit voice encoding), Variable Bit Rate (VBR) and Fax compression.

DTX-360 provides a toll quality compression ratio or gain of 8:1

DTX-240   by ECI Telecom

The DTX-240 Digital Circuit Multiplication Equipment (DCME), first introduced in 1988, accepts up to 240 channels, carrying combinations of voice, non-fax data, fax and 64kbit/s traffic for transmission over a single 2 Mbit/s bearer.

The DTX-240 uses the following compression techniques, Digital Speech Interpolation (DSI), ADPCM (4 bit voice encoding), Variable Bit Rate (VBR) and Fax compression.

DTX-240 provides a toll quality compression ratio or gain of 4:1

DX-3000   by Mitsubishi

The DX-3000 Digital Circuit Multiplication Equipment (DCME) accepts up to 300 channels, carrying combinations of voice, non-fax data, fax and 64kbit/s traffic for transmission over a single 2 Mbit/s bearer.

The DX-3000 uses the following compression techniques, Digital Speech Interpolation (DSI), ADPCM (4 bit voice encoding) and Variable Bit Rate (VBR).

DX-3000 provides a toll quality compression ratio or gain of 4:1 .

Celtic-3G   by ALCATEL

The Celtic-3G Digital Circuit Multiplication Equipment (DCME) accepts up to 240 channels, carrying combinations of voice, non-fax data, fax and 64kbit/s traffic for transmission over a single 2 Mbit/s bearer.

The Celtic-3G uses the following compression techniques, Digital Speech Interpolation (DSI), ADPCM (4 bit voice encoding) and Variable Bit Rate (VBR).

Celtic-3G provides a toll quality compression ratio or gain of 4:1

IAT   by AT&T (Lucent Technology)

Although the IAT (Integrated Access Terminal) performs the same function as other DCME, technically, it is not a DCME. The IAT is a PCME (Packetized Circuit Multiplication Equipment). It packetizes voice, voiceband data, facsimile, digital data and network control signals, using ISDN D-channel (LAPD) protocol. The packets are statistically multiplexed onto to a packet stream and depacketized at the far end.

The IAT uses Digital Speech Interpolation (DSI) and Adaptive Diffferential Pulse Code Modulation (ADPCM) to compress the voice and voiceband data. A toll quality compression ratio of 4:1 can be achieved.

LRE   by OKI

The OKI TC2000 sixty channel transcoder or Low Rate Encoder - LRE, accepts up to 60 channels, carrying combinations of voice and low speed data traffic for transmission over a single 2 Mbit/s bearer. The OKI TC2000 enables Telstra to maximise the effective use of its international transmission facilities to small destinations by utilising the ADPCM (4 bit voice encoding) compression technique.

OKI LRE provides a fixed compression ratio or gain of 2:1

TMUX   by NEC

The DTM6005 sixty channel transmultiplexer accepts 60 channels of digital voice or data ( 2 by 2 Mbit/s bit streams) for transmission over a single analogue 60 channel supergroup. The TMUX does not provide 64 kbit/s transparency over the analogue link.

DOS   by Telstra / DTS

DOS modems (Digital On Supergroup) allow the transmission of digital voice and data signals transparently over an analogue transmission system. Telstra uses two type of DOS modems in its international network, the 1.5 Mbit/s DOS modem and the 2 Mbit/s DOS modem, both types transmit over a single analogue 60 channel supergroup. The 2 Mbit/s DOS modem was developed by Telstra while the 1.5 Mbit/s DOS modem was manufactured by DTS.

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