Bt8370/8375/8376
AppendixA
Fully Integrated T1/E1 Framer and Line Interface
A.2 T1DM Format
A.2 T1DM Format
Table A-2. T1DM Frame Format
Bit Use in Each Time
Slot
F-Bits
Frame #
Bit #
Terminal
Framing Ft
Signaling
Framing Fs
Sync Byte
Info
Ctrl
1
1
0
1
—
—
0
—
10111YR0
—
1–7
—
8
—
8
185–192
193
—
—
—
0
2
1–7
—
2
378–385
386
—
—
—
0
10111YR0
—
—
8
3
1–7
—
3
571–578
579
—
—
—
1
10111YR0
—
—
8
4
1–7
—
4
764–771
772
—
—
—
1
10111YR0
—
—
8
5
1–7
—
5
957–964
965
—
—
—
0
10111YR0
—
—
8
6
1–7
—
6
1150–1157
1158
—
—
—
1
10111YR0
—
—
8
7
1–7
—
7
1343–1350
1351
—
—
—
1
10111YR0
—
—
8
8
1–7
—
8
1536–1543
1544
—
—
—
1
10111YR0
—
—
8
9
1–7
—
9
1729–1736
1737
—
—
—
0
10111YR0
—
—
8
10
10
11
11
12
1–7
—
1922–1929
1930
—
—
—
0
10111YR0
—
—
8
1–7
—
2115–2122
2123
—
—
10111YR0
—
—
8
1–7
Note:
1. Y-bit is used to indicate a Yellow Alarm (active-low).
2. R-bit is used solely by AT&T as an 8 kbps communications channel to collect performance data on long haul DDS facilities.
N8370DSE
Conexant
A-3
CONEXANT [ CONEXANT SYSTEMS, INC ]
