DS2156 datasheet(88/265 Pages) MAXIM

88 / 265 page

DS2156

88 of 265

14.

DS0 MONITORING FUNCTION

The DS2156 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 determines 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 appear in the transmit DS0 monitor (TDS0M) register.

The DS0 channel pointed to by the RCM0 to RCM4 bits 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 register values 0 through 23. E1 channels

1 through 32 map to register values 0 through 31. For example, if DS0 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 Channel Monitor Select

74h

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 appear in the TDS0M register.

Bits 5 to 7/Unused, must be set to 0 for proper operation

TDS0M

Transmit DS0 Monitor Register

75h

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).

DS2156 Datasheet(PDF) 88 Page - Maxim Integrated Products

DS2156 Datasheet(HTML) 88 Page - Maxim Integrated Products

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL