DS3173N datasheet(49/232 Pages) DALLAS

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Table 9-1. Configuration of Port Register Settings

Note: The Line Mode has been configured with the LIU enabled and the JA in the receive path (LM[2:0] = 011) for

all modes. Only Port 1 registers have been displayed.

Test the DS317x with the following configuration settings.

MODE

PORT.CR1

0x040

PORT.CR2

0x042

PORT.CR3

0x044

PORT.CR4

0x046

DS3 C-Bit SCT

0x7C00

0000 0011 0000 0111

0x0000

DS3 M13 SCT

0x7C00

0000 0011 0000 1111

0x0000

E3.751 SCT

0x7C00

0000 0011 0001 0111

0x0000

E3.823 SCT

0x7C00

0000 0011 0001 111X

0x0000

Considerations

For best performance of the CLAD to meet jitter requirements across the temperature range, especially @ -40 C,

the following test registers should be set after reset:

Address 0x20B = 0x11

Address 0x20F = 0x11

9.1 Monitoring and Debugging

To determine if the device is receiving a good signal and that the chip is correctly configured for its environment,

check the following status registers.

Receive Loss of Lock – PORT.SR.RLOL – The clock recovery circuit of the LIU was unable to recover the clock

from the incoming signal. This may indicate that the LIU’s master clock does not match the frequency of the

incoming signal. Verify that the CLAD is configured to match the clock input on the CLKA, CLKB, and CLKC pins

(DS3, E3, STS-1). See Table 10-11.

Loss of Signal – LINE.RSR.LOS – This indicates that the LIU is unable to recover the clock and data because

there is no signal on the line, or that the signal is attenuated beyond recovery.

Loss of Frame – T3.RSR1.LOF (or E3751.RSR1 or E3832.RSR1) – This indicates that the framer was unable to

synchronize to the incoming data. Verify that the FM bits have been correctly configured for the correct mode of

traffic (DS3, E3 G.751, E3 G.832)

Other helpful techniques to utilize in diagnosing a problem include using Line Loopback and Diagnostic Loopback.

These features help to isolate and identify the source of the problem. Line Loopback will loop the receive input to

the transmit output, eliminating the transmit side input from the equation. Diagnostic Loopback will loop the transmit

output before the LIU to the receive framer, eliminating the analog Receive LIU and the receive side analog

circuitry.

One other potential problem is the Line Encoding/Decoding. The device needs to be configured in the same

mode as the far end piece of equipment. If the far end piece of equipment is transmitting and receiving HDB3/B3ZS

encoded data, the DS317x also must be configured to do the same. This is controlled by the LINE.TCR.TZSD and

the LINE.RCR.RZSD bits.

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