Zhone Technologies 900, 800, 600 manual Adpcm Card Descriptions, Adpcm Compression Rates

ADPCM Card Descriptions ADPCM Card

The ADPCM 64 Card can transport low-speed asynchronous data transmission (19.2 kbps or less) from an SRU user card port that will occupy a 24 kbps engine. Each data circuit must be paired with a 40 kbps voice channel. The card can also compress B-channel voice traffic from a BRI card without restricting compression rates.

The Integrated Access System can have up to three ADPCM 64 Cards (two normal cards and an identical redundant card).

The ADPCM 64 Card supports Transition Signaling as defined in ANSI T1.302-1989, with the exception of the Alarm bits. ANSI T1.302 specifies signaling at the 32 bps compression rate. The card uses this scheme for 24 bps and 40 bps, even though those rates are not included in the standard. Table 1-1summarizes the signals supported by each transcoder data rate. Your DS0 time slot configuration must adhere to these specifications.

Table 1-1. ADPCM Compression Rates

Transcoder	Voice Quality	Modem Data	DTMF	FAX
Rate	(MOS)*
24 kbps	3.6-3.8 Range	no	no	no
32 kbps	4.0-4.3 Range	up to 4.8 kbps	OK	Group II
		V.32 9.6 kbps
40 kbps	4.0-4.3 Range	up to 12 kbps	OK	Group III
		V.32 14.4 (no/yes)

*MOS = Mean Opinion Score based on subjective evaluation

1.2.1.1Card Jumper/Switch Settings

The ADPCM 64 Card does not have any jumpers or switches on its motherboard.

1.2.1.2Installing the ADPCM Card

Insert the ADPCM card into one of the server card chassis slots (P1 to P3). The system can accommodate up to three server cards.

1-2 Server Cards