2-6 DS-1 configuration
297-2521-106 Standard 23.01 March 2001
Table 2-3
Channel ordering sequence
(continued)
Time slot D2D3/D4/ESF
10 10 19
11 11 13
12 12 23
13 13 11
14 14 14
15 15 2
16 16 18
17 17 6
18 18 22
19 19 10
20 20 16
21 21 4
22 22 20
23 23 8
24 24 24
—end—
Line coding
Line coding for a DS-1 is bipolar alternate mark inversion (AMI)/2B1Q.
The 6X50AA DS-1 card supports zero code suppression (ZCS) line coding,
and the 6X50AB DS-1 card supports bipolar eight zero substitution (B8ZS)
or ZCS, with the following conditions:
• ZCS coding format requires that the B-channels be used in the 64 kbit/s
restricted mode.
• The B8ZS coding format provides a 64 kbit/s clear channel.
General requirements for DS-1 zerio code supression are as follows:
• a maximum of 15 consecutive zero binary bits
• a minimum average of 12.5% density of one binary bit over any 192
consecutive bits
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