DS2154 Dallas Semiconducotr, DS2154 Datasheet - Page 43

• Manufacturer Part Number: DS2154
• Description: Enhanced E1 Single Chip Transceiver
• Manufacturer: Dallas Semiconducotr

6.0 DS0 MONITORING FUNCTION
The DS2154 has the ability to monitor one DS0 64 kbps channel in the transmit direction and one DS0
channel in the receive direction at the same time. In the transmit direction the user will determine which
channel is to be monitored by properly setting the TCM0 to TCM4 bits in the CCR4 register. In the
receive direction, the RCM0 to RCM4 bits in the CCR5 register need to be properly set. The DS0
channel pointed to by the TCM0 to TCM4 bits will appear in the Transmit DS0 Monitor (TDS0M)
register and the DS0 channel pointed to by the RCM0 to RCM4 bits will appear in the Receive (RDS0M)
register.
The TCM4 to TCM0 and RCM4 to RCM0 bits should be programmed with the decimal decode of the
appropriate E1 channel. For example, if DS0 Channel 6 (timeslot 5) in the transmit direction and DS0
Channel 15 (timeslot 14) in the receive direction needed to be monitored, then the following values would
be programmed into CCR4 and CCR5:
CCR4: DS0 MONITORING FUNCTION (Address=A8 Hex)
[repeated here from section 3 for convenience]
(MSB)
RLB
SYMBOL
TCM4
TCM3
TCM2
TCM1
TCM0
LIAIS
RLB
LLB
LLB
POSITION
CCR4.7
CCR4.6
CCR4.5
CCR4.4
CCR4.3
CCR4.2
CCR4.1
CCR4.0
LIAIS
TCM4=0 ........................................................................................ RCM4=0
TCM3=0 ........................................................................................ RCM3=1
TCM2=1 ........................................................................................ RCM2=1
TCM1=0 ........................................................................................ RCM1=1
TCM0=1 ........................................................................................ RCM0=0
NAME AND DESCRIPTION
Remote Loopback. See Section 3 for details.
Local Loopback. See Section 3 for details.
Line Interface AIS Generation Enable. See Section 3 for
details.
Transmit Channel Monitor Bit 4. MSB of a channel decode
that determines which transmit DS0 channel data will appear in
the TDS0M register.
Transmit Channel Monitor Bit 3.
Transmit Channel Monitor Bit 2.
Transmit Channel Monitor Bit 1.
Transmit Channel Monitor Bit 0. LSB of the channel decode
that determines which transmit DS0 channel data will appear in
the TDS0M register.
TCM4
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TCM3
TCM2
TCM1
TCM0
(LSB)
DS2154