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Table 7: 1 in 8 TEST PATTERN FOR B8ZS LINE CODING

Pattern Average Ones Dens-

ity

Maximum Zeros Circuit Stressed

1 in 8 (un-framed) 12.5% 7 Timing

1 in 8 (framed)* 12.5% 8 Timing

*When the 1 in 8 bit pattern is sent with framing bits, the 1 bit must be located in the second position to prevent a

yellow alarm or excessive zero condition.

5.5. 3 in 24 PATTERN

This pattern simultaneously stresses both the minimum ones density and the maximum number of consecutive zeros.

This sequence is useful for testing the timing recovery circuit of the repeater. When framed, the frame bit must be

located in the position identified, or either a yellow alarm or a sequence of 16 zeros will occur. This test pattern is used

to test the minimum ones density for an AMI line code.

. . . 0100 F 01000100 00000000 00000100 01000100. . .

Table 8: 3 in 24 TEST PATTERN FOR AMI LINE CODING

Pattern Average Ones Dens-

ity

Maximum Zeros Circuit Stressed

3 in 24 (un-framed) 12.5% 15 Timing

3 in 24 (framed)* 12.5% 15 Timing

The frame bit location must be as specified to prevent a D4 yellow alarm or excessive zero condition.

5.6. ALL ONES

This sequence is useful for stressing the regenerator circuit of a repeater. When received, the all ones sequence

causes the repeater to consume the maximum amount of power. If inadequate, DC power is provided by the office

repeater through the simplex current path, which may cause the repeater to drop out.

AT&T Practice ATT-TP-000-000-006

Issue 1, 08/25/06

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ADC HDSL4 Bedienungsanleitung Seite 14