Zhone IMACS 8000, User Manual

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19-8 Server Cards
Model No.
Running Head
ADPCM Server Card Specifications ADPCM Card
19.6 ADPCM Server Card Specifications
ADPCM Card (ADPCM)
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