Comtech EF Data SDM-9220 - Manual (Page 123)

Networking Features
Memotec Inc. 7-3
7.2 Voice Channels
• Voice compression algorithms : ACELP-CN (8K/6K), G.729/G.729A (8K), G.711
(PCM 64K), G.723 (low 5.3K/high 6.4K), G.726 (ADPCM 16K/24K/30K/40K)
• Dialing : Multi-Frequency (MF), Dual Tone Multi-Frequency (DTMF) or Pulse
• Line activation : dedicated or switched
• Fallback : buffering scheme for packetization of DSP packets:
• Signaling : E&M 4w/2w (Type I, II and V) Immediate Start, Wink Start; Loop
Start and Ground Start FXS (OPX) and FXO (SLT), ISDN-BRI, ISDN-PRI,
QSIG, custom signaling; software configurable
• Voice/fax line impedance : 600/900 ohms or complex
• Echo cancellation : CCITT G.165
• Fax Relay : Group III FAX 4.8, 7.2, 9.6, 12.0, 14.4 Kbps, over PowerCell. Super
G3 configurable to passthrough or fallback to G3. Group IV fax and other non-
voice bearer ISDN channel at 64K
• Fax signal types : V.21 channel 2, V27ter 2400 bps, V27ter 4800 bps, V29 7200
bps, V29 9600 bps, V33 12000bps, V33 14400bps, V17 7200bps, V17 9600bps,
V17 12000bps, V17 14400bps
• Modem Relay : V.32bis demodulation up to 14.4 Kbps, modem passthrough
(G.711) for other modem types
• Encoding : Mu-law or A-law
Compression Packetization Fallback (Buffering)
ACELP-CN 8K and 6K
(configurable)
up to 5
G.723 6.4K and 5.3K
(configurable)
up to 3
G.726 16K 16K none
G.726 24K 24K none
G.726 32K 32K none
G.726 40K 40K none
G.729, G.729A 8K up to 8
PCM64K 64K up to 2
Table 7-1: Packetization of DSP packets