AVT MAGIC ISDN, Hardware Description

Page: 50 / 66

PA G E 5 0
T E C H N I C A L D A T A
Operator interfaces
Operator interface RS 232 C
TTLI/O interface, programmable by operator, control current
max. 5 mA per channel
Bus system Internal bus
No. of channels
Variable, dependent on configuration and equipping, e.g.
max. 20 mono channels, or 10 stereo channels
A1.2 Audio Codec Layer II / III
Coding standard ISO/MPEG Layer III (as per ISO/IEC 11172-3)
ISO/MPEG Layer II (as per ISO/IEC 11172-3)
DAB ETS 300 401
No. of channels 2
×
mono or
1
×
stereo
Data rates Layer II: 40-kbit/s to 384-kbit/s
Layer III: 40-kbit/s to 256-kbit/s
Sampling frequencies 32, 44.1 or 48-kHz (selectable) for digital input
48 kHz for analogue input
Modes of operation Mono L, Mono R, Mono (L+R)/2,
Dual channel, Stereo, Joint Stereo
Audio interface Digital input as per AES/EBU professional
Digital output as per AES/EBU professional
Data interface RS 232C for additional data
(variable baud rate)
Error detection CRC16 check in ISO/MPEG data stream
(switchable)
Measures taken on detection of errors
Muting / repetition
Bus system Internal bus
TABLE 4.1 DELAY TIMES AT 48-kHZ
Data rate Layer III Layer II
64-kbit/s (Mono) ca. 290 ms 145 ms
128-kbit/s (Mono) ca. 250 ms 140 ms
192-kbit/s (Stereo) ca. 245 ms 135 ms
256-kbit/s (Stereo) ca. 230 ms 130 ms
320-kbit/s (Stereo) 130 ms
384-kbit/s (Stereo) 130 ms
}
bidirektional