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CDQPrima USERS GUIDE

6-146-14

6.1.3.5 Encoder Line Format

Four line formats are available: Single Line (1 LN), uses only one of the

available lines. Dual Line (CCS 2 LN), uses inverse-multiplexing to

combine two available lines for 112 or 128 kb/s operation over ISDN or

other dedicated lines. H.221 (H221 6 LN) uses BONDING to combine up

to 6 lines (with internal terminal adapters) to achieve bit rates up to 384

kb/s over ISDN. Independent Mono (Ind. Mono) uses two or more

available lines to send different audio programs to two or more

different locations. The single line mode supports all available bit rates,

Dual Line supports only 112 and 128 kb/s. H.221 supports any multiple

of 64 kb/s, up to six. Independent mono supports only 56 and 64 kb/s

operation.

Since G.722 supports only 56 or 64 kb/s, if G.722 is selected, the valid

choices for line format are Single Line and Independent Mono. Any

MPEG Layer II algorithm supports all four line formats, and MPEG

Layer III supports only Single Line and Dual Line.

Encoder Algorithm

G.722 MPEG Layer 2 Mpeg Layer 3

Single Line

ü ü ü

Dual Line

ü ü

Ind. Mono send & receive send only receive only

H.221

Select the encoder line format at the

display. If you select the 1 LN, CCS 2-LN or H221 6 LN line modes, you

will then be prompted for the line number(s) to use. If you select Ind.

Mono you will be prompted to enter the line number(s) for the left and

right channels, and for MPEG Layer II, which channels to use for

ancillary data.

From a terminal, use the ELI command to select the line format.

6.1.3.6 Encoder Sample Rate

The next step is to select the encoder sample rate. The choices are 16

(not available with MPEGL Layer 3, only valid choice with G.722), 24,

For Layer III independent mono receive, select decoder line format = CCS2LN

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Musicam Roadrunner Manual do Utilizador Página 14