DS2196 datasheet(96/157 Pages) DALLAS

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DS2196

96 of 157

16.

ERROR INSERTION FUNCTION

An Error insertion function is available in each formatter of the DS2196 and is used to create errors in the

payload portion of the T1 frame in the transmit path. See Figure 21-7 for location. Errors can be inserted

over the entire frame or the user may select which channels are to be corrupted. Errors are created by

inverting the last bit in the count sequence. For example if the error rate 1 in 16 is selected, the 16th bit is

inverted. F-bits are excluded from the count and are never corrupted. Error rate changes occur on frame

boundaries. Error insertion options include continuous and absolute number with both options supporting

selectable insertion rates.

Transmit error insertion setup guideline.

Enter desired error rate in the ERC register. Refer to table 16-1 for available

rates. Note: If ER3:0 = 0, no errors will be generated even if the constant error

insertion feature is enabled.

2A.

For constant error insertion set CE = 1 (ERC.4).

2B.

For a defined number of errors:

- Set CE = 0 (ERC.4)

- Load NOE1 & NOE 2 with the number of errors to be inserted

- Toggle WNOE (ERC.7) from 0 to 1, to begin error insertion

DS2196 Datasheet(PDF) 96 Page - Dallas Semiconductor