BT8375 Datasheet, PDF (196/323 Pages) Conexant Systems, Inc – single chip transceivers for T1/E1 and Integrated Service Digital Network (ISDN) primary rate interfaces

3.12 Transmitter Registers
Bt8370/8375/8376
Fully Integrated T1/E1 Framer and Line Interface
TPATT[1:0]
PRBS test patterns used by RPATT [addr 041] and TPATT [addr 076] are defined in the ITU
standards O.151 and O.152 to use either inverted or non-inverted data. Bt8370/8375/8376 uses
standard data inversion for the selected PRBS test pattern unless ZLIMIT is enabled, in which
case the test pattern uses non-inverted data (see Table 3-21).
Table 3-21. Transmit PRBS Test Pattern
FRAMED
ZLIMIT
TPATT
Test Pattern
Inversion
0
0
00
Unframed 2¹¹
No
0
0
01
Unframed 2¹⁵
Yes
0
0
10
Unframed 2²⁰
No
0
0
11
Unframed 2²³
Yes
0
1
00
Unframed 2¹¹ with 7 zero limit
No
0
1
01
Unframed 2¹⁵ with 7 zero limit
No
0
1
10
Unframed 2²⁰ with 14 zero limit (QRSS/QRS/QRTS)
No
0
1
11
Unframed 2²³ with 14 zero limit (non-std)
No
1
0
00
Framed 2¹¹
No
1
0
01
Framed 2¹⁵
Yes
1
0
10
Framed 2²⁰
No
1
0
11
Framed 2²³
Yes
1
1
00
Framed 2¹¹ with 7 zero limit
No
1
1
01
Framed 2¹⁵ with 7 zero limit (non std)
No
1
1
10
Framed 2²⁰ with 14 zero limit (QRSS/QRS/QRTS))
No
1
1
11
Framed 2²³ with 14 zero limit (non-std)
No
3-78
Conexant
N8370DSE