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1-8 IMACS System Release 5.1.6 Server Cards
Model No.
Running Head
ADPCM Server Card Specifications ADPCM Card
1.6 ADPCM Server Card Specifications
ADPCM Card (887160)
Input Voice Channels Can originate from any 2-wire or 4-wire voice card or from a DSO on a
WAN (El/T1 or HDSL) interface. µ-law & A-law 64Kbps PCM
compatible on a per channel basis.
Input Sub-rate Data SRU data traffic at 19.2Kbps or less can be carried on a 24Kbps
sub-channel.
Input BRI traffic B channel voice traffic can be compressed at any of the configurable
rates.
Modem Data Support Transcoder rate: 24, 32 or 40 Kbps; Modem Data: none, up to 4.8Kbps,
V.32 to 9.6Kbps, up to 12Kbps and V.32 bis to 14.4Kbps
Fax Support Transcoder rate for fax: 24, 32 or 40 Kbps; none, Group II and Group
III fax.
Voice Quality As measured by Mean Opinion Score (MOS) analysis, a subjective
evaluation with a range of 0 (poor quality) to 5 (good quality). Toll
quality voice is accorded a MOS of 4.0 24Kbps transcoder rate MOS is
3.6-3.8; 32Kbps transcoder rate MOS is 4.0-4.3 and 40Kbps transcoder
rate MOS is 4.0-4.3
Echo Cancellation Non provided—typically not required
Signaling Transmitted in-band utilizing CAS transitional signaling, as per ANSI
T1.302—1986 for 32Kbps and modified for use with 24Kbps and
40Kbps. Note Robbed Bit Signaling Alarm Transmission, as specified
in ANSI T1.302a-1989 is not supported.
Maximum Card Count 3 (2 active, 1 redundant)
Transcoder Operation Compliant to G.761 Alarm Indication and Fault Handling.
Standards Compatibility
ANSI T1.302 1989
T1.302a 1992
T1.303 1989
CEN EN 500 081-1
EN 500-092-1
EN 60950/A2
ITU-T G.721
G.723
G.726 12/90