cx28394 Conexant Systems, Inc., cx28394 Datasheet - Page 162

• Manufacturer Part Number: cx28394
• Description: Quad/x16/octal-t1/e1/j1 Framers
• Manufacturer: Conexant Systems, Inc.

3.0 Registers
3.9 Receiver Registers
Table 3-12. Receive PRBS Test Pattern Measurements (2 of 2)
ZLIMIT
RPATT[1:0]
Unused bits are reserved and should be written to 0.
DN_LEN[1:0]
3-40
042—Receive Loopback Code Detector Configuration (RLB)
FRAMED
—
7
1
1
1
1
1
1
PRBS Zero 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 received bit
error ratio during out of service testing. Refer to
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. Standard data
inversion is used for selected PRBS test patterns unless ZLIMIT is enabled, in which case the
test pattern always uses non-inverted data.
Loopback Deactivate Code Length—Selects the number of loopback pattern bits from LBD
[addr 044] that are compared to received data. This is done in order to determine whether a
Loopback Deactivate Code [LOOPDN; addr 048] has been detected. LOOPDN is recovered if
the received data pattern contains fewer than 63 bit errors in a 24 ms period, or lost if 64 or
more bit errors are detected in a subsequent 24 ms period. F-bits that overwrite or are inserted
into the loopback pattern are not counted as bit errors. Accurate code detection is provided on
lines with up to 1E-3 BER.
ZLIMIT
—
6
0
0
1
1
1
1
DN_LEN
00
01
10
11
—
5
RPATT
10
11
00
01
10
11
LBD Length
Table 3-12
4 bits
5 bits
6 bits
7 bits
Framed 2
Framed 2
Framed 2
Framed 2
Framed 2
Framed 2
—
4
Conexant
20
23
11
15
20
23
for test pattern measurement options.
with 7 zero limit
with 7 zero limit (non-std)
with 14 zero limit (QRSS/QRS/QRTS)
with 14 zero limit (non-std)
Test Pattern Measurements
DN_LEN[1]
3
Table 3-12
DN_LEN[0]
2
Quad/x16/Octal—T1/E1/J1 Framers
for test pattern measurement
CX28394/28395/28398
UP_LEN[1]
1
Inversion
UP_LEN[0]
Yes
100054E
No
No
No
No
No
0