Datasheet

DS26514 4-Port T1/E1/J1 Transceiver

19-5856; Rev 4; 5/11 69 of 305

9.9.10 DS0 Monitoring Function

The DS26514 can monitor one DS0 (64kbps) channel in the transmit direction and one DS0 channel in the receive

direction at the same time.

Table 9-32 shows the registers related to the control of transmit and receive DS0.

Table 9-32. Registers Related to DS0 Monitoring

FRAMER 1

ADDRESSES

FUNCTION

Transmit DS0 Channel Monitor Select

TDS0SEL)

189h Transmit channel to be monitored.

Transmit DS0 Monitor Register

(

TDS0M)

1BBh Monitored data.

Receive Channel Monitor Select Register

(

RDS0SEL)

012h Receive channel to be monitored.

Receive DS0 Monitor Register

(

RDS0M)

060h Monitored data.

Note: The addresses shown above are for Framer 1. Addresses for Framers 2 to 4 can be calculated using the following: Framer n = (Framer 1

address + (n - 1) x 200hex), where n = 2 to 4 for Framers 2 to 4.

In the transmit direction the user will determine which channel is to be monitored by properly setting the TCM[4:0]

bits in the

TDS0SEL register. In the receive direction, the RCM[4:0] bits in the RDS0SEL register need to be

properly set. The DS0 channel pointed to by the TCM[4:0] bits will appear in the Transmit DS0 Monitor Register

(

TDS0M) and the DS0 channel pointed to by the RCM[4:0] bits will appear in the Receive DS0 Monitor Register

(

RDS0M). The TCM[4:0] and RCM[4:0] bits should be programmed with the decimal decode of the appropriate

T1or E1 channel. T1 channels 1 to 24 map to register values 0 to 23. E1 channels 1 to 32 map to register values 0

to 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