Specifications
© Copyright IBM Corp. 2000 193
Appendix D. Specifications of IBM 9783
The section will provide you with a basic understanding of the specifications
related to voice, trunking and frame relay of IBM 9783.
D.1 Analog Voice Ports
Electrical Interface: All telco interfaces are provided by two, 50-pin RJ2 HX
connectors (IBM 9783 support up to eight channels). The 9783 supports E&M tie
trunk interfaces of types 1, 2, 3, 4, and 5. The 9783 supports both normal and
reverse connections for each type. The 9783 supports Loop Start signaling for
FXS and FXO.
Echo Cancellation: Echo cancellation for Fax III meets or exceeds ITU-T G.165
for near-end echoes delayed by 0 to 45 msec. The 9783 supports minimum Echo
Return Loss (ERL) greater than 6 dB.
Echo canceller is console-configurable or can be automatically disabled by
modem tone per ITU-T specifications. The automatic tone disabling feature is
console-configured. Non-linear processing (also referred to as NLP, center
clipping, or residual echo suppression) is console configurable.
Signaling: The 9783 supports FXS loop start, FXO loop start, immediate start,
and wink start with DTMF dialing on analog and digital interfaces. The 9783
supports R2 signaling.
Voice Levels: Transmit and receive levels are console-configurable for each
voice channel within the range of -16 dB to +7 dB in 0.5 dB increments.
Fax III: The 9783 supports full V.29, 9.6 kbps Group III fax rate. Fax III channels
allocated 9.6 kbps or more will process voice, signaling, and full 9.6 kbps fax on
demand without intervention between automatic stations. Channels allocated less
than 9.6 kbps also transport Group III fax transparently at 7.2 kbps, or 4.8 kbps
depending on available bandwidth. Processing latency in either the transmit or
receive direction is less than 400 ms. The 9783 supportsThe 9783 provides auto
fallback, and tolerates network delays of up to 1 second.
Voice Compression: The 9783 provides high-quality voice at the following rates:
ATC* 7.47 to 32 kbps in increments of 533 bps
CELP* 5.33 kbps, 8.0 kbps, and 9.6 kbps
E-CELP 4.8 kbps, 7.47 kbps, and 9.6 kbps
E-CELP LPR** 4.8 kbps, 7.47 kbps, and 9.6 kbps
G.728 16 kbps
G.729 8 kbps (This vocoder is available as an option.)
ADPCM 32 kbps
Note : * These vocoders are not available in Release 3.1 and later releases.
** This vocoder is available in Release 3.2 and later releases.