參數(shù)資料
型號: AM79C32A
廠商: Advanced Micro Devices, Inc.
英文描述: Digital Subscriber Controller⑩ (DSC⑩) Circuit
中文描述: 數(shù)字用戶控制器⑩法(DSC⑩)電路
文件頁數(shù): 22/101頁
文件大小: 1607K
代理商: AM79C32A
22
Am79C30A/32A Data Sheet
Therefore, in this example, MCR1 provides a data link
from the S Interface and MCR2 sets up a voice connec-
tion across the S Interface.
To loopback a channel, the same channel code is used
for port 1 and port 2. For example, to loopback B1, B2,
and Ba, the MCRs would be:
MCR3 has higher priority than MCR2. MCR2 has
higher priority than MCR1.
If multiple connections are made to the same port, the
data from the connecting ports in the highest priority
MCR will overwrite the data from the connecting port in
the lower priority MCR, for example:
The final data transfers are:
B1 (LIU) receives Bb (MPI),
Ba (MAP) receives Bb (MPI),
Bb (MPI) receives Ba (MAP).
Therefore, the data transfer from B1 (LIU) to Bb (MPI)
is lost in the arrangement proposed in MCR2.
Port 1
Port 2
Register 7 6 5 4 3 2 1 0 Channel Connection
MCR1
0 0 0 1 0 0 0 1 B1 (LIU) Loopback
MCR2
0 0 1 0 0 0 1 0 B2 (LIU) Loopback
MCR3
0 0 1 1 0 0 1 1 Ba (MAP) Loopback
Peripheral Port
B-channel
MUX
Ba MAP
MPI
Bb
Bc
Bd
Be
Bf
B1
B2
LIU
09893H-3
Figure 2.
MUX Logical Channels
Port 1
Port 2
Register 7 6 5 4 3 2 1 0 Channel Connection
MCR1
0 0 0 0 0 0 0 0 No connect
MCR2
0 0 0 1 0 1 0 0 B1 (LIU)
Bb (MPI)
MCR3
0 1 0 0 0 0 1 1 Bb (MPI)
Ba (MAP)
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