BT8375 CONEXANT [Conexant Systems, Inc], BT8375 Datasheet - Page 167

• Manufacturer Part Number: BT8375
• Description: single chip transceivers for T1/E1 and Integrated Service Digital Network (ISDN) primary rate interfaces
• Manufacturer: CONEXANT [Conexant Systems, Inc]

Bt8370/8375/8376
Fully Integrated T1/E1 Framer and Line Interface
FRAMED
Table 3-11. Receive PRBS Test Pattern
ZLIMIT
RPATT[1:0]
N8370DSE
FRAMED
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
PRBS Framed—When set, PRBS test pattern bits are not checked during framing bit positions.
In T1 mode, F-bit locations are not searched. In E1 mode, time slot 0 and time slot 16 (if CAS
framing is selected) are not searched. CAS framing is selected by setting RFRAME[3] to 1 in
the Primary Control register [CR0; addr 001]. If FRAMED is disabled, the PRBS pattern
receiver searches all time slots for the test pattern. FRAMED, ZLIMIT, and RPATT establish
the test pattern measurement type as listed in
PRBS 0 Limit—Determines the number of consecutive zeros allowed within the selected
PRBS test pattern. Refer to
PRBS Test Pattern—Selects one of four PRBS test pattern lengths used to measure the
received bit error ratio during out of service testing. Refer to
measurement options. 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 the standard data inversion option for the selected PRBS test pattern
unless ZLIMIT is enabled, in which case the test pattern always uses non-inverted data.
ZLIMIT
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
RPATT
00
01
10
11
00
01
10
11
00
01
10
11
00
01
10
11
Table 3-11
Unframed 2
Unframed 2
Unframed 2
Unframed 2
Unframed 2
Unframed 2
Unframed 2
Unframed 2
Framed 2
Framed 2
Framed 2
Framed 2
Framed 2
Framed 2
Framed 2
Framed 2
Conexant
11
15
20
23
11
15
20
23
for test pattern measurement options.
11
15
20
23
11
15
20
23
with 7 0 limit (non-std)
with 7 0 limit
with 14 0 limit (QRSS/QRS/QRTS)
with 14 0 limit (non-std)
with 7 0 limit
with 7 0 limit (non-std)
with 14 0 limit (QRSS/QRS/QRTS)
with 14 0 limit (non-std)
Table
Test Pattern
3-11.
Table 3-11
for test pattern
3.8 Receiver Registers
Inversion
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No
No
No
No
No
3-49