NEAX2400 IPX ISDN Features and Specifications
NDA-24311, Issue 1 Page 121
Simultaneous Voice and Data Transmissions - PRI S-86
S-86 Simultaneous Voice and Data Transmissions - PRI
General Description
This feature is provided by NEC’s proprietary NEAX2400 IPX digital Dterm family of terminal equipment. A 64
kbps digital voice signal and a data signal of up to 56 kbps can be transmitted simultaneously over the same 2-pair
cable. Voice and data calls can be placed to different locations via PRI.
Operating Procedure
To place a voice call
1. Go off-hook or press the Dterm’s SPEAKER key.
2. The Prime Line LED flashes and dial tone is received. If the SPEAKER key is used, the SPEAKER LED
illuminates steadily.
3. Dial a voice extension of the distant PBX.
4. When the called party answers, voice communication can begin.
To initiate a data call while the voice call is in progress
1. While a voice call is in progress, user A presses the DTX key.
2. On user A’s Dterm, the DTX LED illuminates, the DATA LED flashes, and displays:
3. When user B answers, both parties’ DATA LEDs illuminate steadily; both LCDs display:
Data communication can begin.
4. The voice call is not interrupted during this process. After 5 seconds, the voice call display returns.
The DSPY/AUTO key can be pressed to return the following display:
(Time Display)
D DTE XXXX
(Time Display)
READY D DTE XXXX
(Time Display)
READY D DTE XXXX