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7.2.2. Line Interface Loopback
This card has a relay for loopback test on the primary side of the line to cut and divide into the
line failure or the PBX's own failure, when there is a defect in operation.
7.3. DSP
7.3.1. DSP Function Outline
This card realizes the following functions as in-band signaling function by DSP.
-DTMF Receiver
-DTMF Generator
-MFC-R1/R2 Receiver
-MFCR1/R2 Generator
However, DTMF Generator has also a resource on the Main Body side of the TDA160 system.
Table 5.5 shows a list of the DSP Resources by card type.
See the "DSP Interface Specification for T1 Card" for the details.
Table 5.5 List of DSP Resource by Card Type
Card Type
Function
T1
DTMF Generator
DTMF Receiver
MFC-R1
Generator
MFC-R1 Receiver
7.3.2. DSP Peripheral Interface
The function of the DSP shown in Table 5.5 is processed through the PCM highway. The PCM
highway is connected with a local highway (2.048Mbps) of the ASIC (IC2) through the
Fig.5.3 Outline diagram of the line interface
Resource Target Specification
No. of Channels
24
24
24
24
21
Procedure of Implementation
DTMF Generator on the Main Body
DSP
DSP
DSP
DSP
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