![](http://datasheet.mmic.net.cn/330000/PEF20550_datasheet_16444055/PEF20550_115.png)
PEB 20550
PEF 20550
Operational Description
Semiconductor Group
115
01.96
The subscriber’s upstream time slots 2 and 3 are initialized as monitor and C/I-channels
with decentral D-channel handling
Write
MADR = FF
H
received C/I-code to be compared to '1111'
B
Write
MAAR = 88
H
from upstream CFI-port 0, time slot 2
Write
MACR = 78
H
write CM-data addressed by MAAR with content of MADR;
write CM-code addressed by MAAR with '1000'
B
(even
address code for decentral monitor and C/I-channels)
Read
STAR
Wait for STAR:MAC = 0
Write
MAAR = 89
H
from upstream CFI-port 0, time slot 3
Write
MACR = 70
H
write CM-code addressed by MAAR with '0000'
B
(odd
address code for decentral monitor and C/I-channels)
Read
STAR
Wait for STAR:MAC = 0
The subscriber’s downstream B
1
-channel is internally looped via PCM-port 1, time slot 1
Write
MADR = 85
H
internal loop from PCM-port 1, time slot 1
Write
MAAR = 00
H
to downstream CFI-port 0, time slot 0
Write
MACR = 71
H
write CM-data addressed by MAAR with content of MADR;
write CM-code addressed by MAAR with '0001'
B
(code for a
simple 64-kbit/s connection)
Read
STAR
Wait for STAR:MAC = 0
The subscriber’s downstream B
2
-channel is switched from PCM-port 0, time slot 1
Write
MADR = 01
H
connection from PCM-port 0, time slot 1
Write
MAAR = 01
H
to downstream CFI-port 0, time slot 1
Write
MACR = 71
H
write CM-data addressed by MAAR with content of MADR;
write CM-code addressed by MAAR with '0001'
B
(code for
a simple 64-kbit/s connection)
Read
STAR
Wait for STAR:MAC = 0
The subscriber’s downstream time slots 2 and 3 are initialized as monitor and C/
I-channels with D-channel handling by the SACCO-A
Write
MADR = FF
H
C/I-code to be transmitted = '1111'
B
(MADR = F3
H
D-channel blocking code '1100'
B
to be transmitted.)
Write
MAAR = 08
H
to downstream CFI-port 0, time slot 2
Write
MACR = 7A
H
write CM-data addressed by MAAR with content of MADR;
write CM-code addressed by MAAR with '1010'
B
(even
address code for monitor and C/I-channels with D-channel
handling by SACCO-A)
Read
STAR
Wait for STAR:MAC = 0
Write
MAAR = 09
H
from upstream CFI-port 0, time slot 3
Write
MACR = 7B
H
write CM-code addressed by MAAR with '1011'
B
(odd
address code for monitor and C/I-channels with D-channel
handling by SACCO-A)
Read
STAR
Wait for STAR:MAC = 0