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09/03

2-341

DC 3535/2240/1632, WC M24

16-389, 16-390

Status Indicator RAPs

Initial issue

16-389 DFE/ESS Communication Failure 19

NAK-generated packet number error.

Initial Actions

Switch the power off, then on. If the problem continues, check the connections at the MCU

PWB and the I/F PWB. Check that the DDI cables from the Network Controller (NC) to the IOT

are secured and are free from damage.

Procedure

Switch off the power. Disconnect the DDI cables and the network cable from the NC to the IOT.

Switch on the power. The fault, or another DFE communications fault (16-361 through 16-

390) is still present.

Reload DFE software. If the problem persists, Switch the DDI cables from the NC to the

IOT (switch both ends). If the problem changes, replace the cables.

If the problem continues, verify that the NC is functioning correctly. Refer to the NC ser-

vice documentation.

• Reload IOT software.

• Replace the VSEL PWB (PL 13.1).

• Replace the ESS PWB (PL 13.1).

• Replace the MCU PWB (PL 13.1).

If the problem persists, replace the Network Controller.

16-390 DFE/ESS Communication Failure 20

Initialization request from DFE not received within the allotted time.