DS2196 datasheet(70/157 Pages) DALLAS

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DS2196

70 of 157

10.

DS0 MONITORING FUNCTION

Each framer in the DS2196 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 CCR5A &

CCR5B registers. In the receive direction, the RCM0 to RCM4 bits in the CCR6A & CCR6B registers

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 DS0 (RDS0M) register. The TCM4 to TCM0 and RCM4 to RCM0 bits should

be programmed with the decimal decode of the appropriate T1 channel. Channels 1 through 24 map to

in the receive direction needed to be monitored, then the following values would be programmed into

CCR5 and CCR6:

TCM4 = 0

RCM4 = 0

TCM3 = 0

RCM3 = 1

TCM2 = 1

RCM2 = 1

TCM1 = 0

RCM1 = 1

TCM0 = 1

RCM0 = 0

CCR5A: COMMON CONTROL REGISTER 5 FRAMER A (Address = 19 Hex)

CCR5B: COMMON CONTROL REGISTER 5 FRAMER B (Address = B9 Hex)

[Repeated here from section 6 for convenience with only the TX monitor function present]

(MSB)

(LSB)

TCM4

TCM3

TCM2

TCM1

TCM0

SYMBOL

POSITION

NAME AND DESCRIPTION

TCM4

CCR5.4

Transmit Channel Monitor Bit 4. MSB of a channel decode

that determines which transmit channel data will appear in the

TDS0M register.

TCM3

CCR5.3

Transmit Channel Monitor Bit 3.

TCM2

CCR5.2

Transmit Channel Monitor Bit 2.

TCM1

CCR5.1

Transmit Channel Monitor Bit 1.

TCM0

CCR5.0

Transmit Channel Monitor Bit 0. LSB of the channel

decode.

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