DS2154 datasheet(43/87 Pages) DALLAS

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DS2154

43 of 87

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)

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:

TCM4=0 ........................................................................................ RCM4=0

TCM3=0 ........................................................................................ RCM3=1

TCM2=1 ........................................................................................ RCM2=1

TCM1=0 ........................................................................................ RCM1=1

TCM0=1 ........................................................................................ RCM0=0

CCR4: DS0 MONITORING FUNCTION (Address=A8 Hex)

[repeated here from section 3 for convenience]

(MSB)

(LSB)

RLB

LLB

LIAIS

TCM4

TCM3

TCM2

TCM1

TCM0

SYMBOL

POSITION

NAME AND DESCRIPTION

RLB

CCR4.7

Remote Loopback. See Section 3 for details.

LLB

CCR4.6

Local Loopback. See Section 3 for details.

LIAIS

CCR4.5

Line Interface AIS Generation Enable. See Section 3 for

details.

TCM4

CCR4.4

Transmit Channel Monitor Bit 4. MSB of a channel decode

that determines which transmit DS0 channel data will appear in

the TDS0M register.

TCM3

CCR4.3

Transmit Channel Monitor Bit 3.

TCM2

CCR4.2

Transmit Channel Monitor Bit 2.

TCM1

CCR4.1

Transmit Channel Monitor Bit 1.

TCM0

CCR4.0

Transmit Channel Monitor Bit 0. LSB of the channel decode

that determines which transmit DS0 channel data will appear in

the TDS0M register.

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