DS26401 datasheet(119/309 Pages) DALLAS

119 / 309 page

DS26401 Octal T1/E1/J1 Framer

119

9.8 T1 Transmit DS0 Monitoring Function

The DS26401 has the ability to monitor one DS0 (64kbps) 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 TDS0SEL register. In the receive direction, the RCM0

to RCM4 bits in the RDS0SEL 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 DS0 (RDS0M) register. The TCM4 to TCM0 and RCM4 to RCM0 bits should

be programmed with the decimal decode of the appropriate T1or E1 channel. T1 channels 1 through 24 map to

channel 6 in the transmit direction and DS0 channel 15 in the receive direction needed to be monitored, then the

following values would be programmed into TDS0SEL and RDS0SEL:

TCM4 = 0

RCM4 = 0

TCM3 = 0

RCM3 = 1

TCM2 = 1

RCM2 = 1

TCM1 = 0

RCM1 = 1

TCM0 = 1

RCM0 = 0

TDS0SEL

Transmit DS0 Channel Monitor Select

189h + (200h x n) : where n = 0 to 7, for Ports 1 to 8

Bit #

Name

—

TCM4

TCM3

TCM2

TCM1

TCM0

Default

Bits 0 to 4 / Transmit Channel Monitor Bits (TCM0 to TCM4).

TCM0 is the LSB of a 5 bit channel select that

determines which transmit channel data will appear in the TDS0M register.

Bits 5 to 7 / Unused. Must be set = 0 for proper operation.

TDS0M

Transmit DS0 Monitor Register

1BBh + (200h x n) : where n = 0 to 7, for Ports 1 to 8

Bit #

Name

Default

Bits 0 to 7 / Transmit DS0 Channel Bits (B1 to B8).

Transmit channel data that has been selected by the

Transmit Channel Monitor Select Register. B8 is the LSB of the DS0 channel (last bit to be transmitted).

DS26401 Datasheet(PDF) 119 Page - Dallas Semiconductor

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