CX28398 Conexant Systems, CX28398 Datasheet - Page 157

• Manufacturer Part Number: CX28398
• Description: (CX28394 - CX28398) Quad/x16/Octal?T1/E1/J1 Framers
• Manufacturer: Conexant Systems

CX28394/28395/28398
Quad/x16/Octal—T1/E1/J1 Framers
ZCSUB
EXZ
BPV
100054E
021—Receive Line Code Status (RSTAT)
—
7
Zero Code Substitution—Indicates one or more B8ZS/HDB3 substitution patterns have been
detected on receiver input data, depending on T1/E1N line rate selection. ZCSUB is reported
regardless of whether ZCS decoding is enabled [RAMI; addr 040]. ZCSUB is latched active
high upon detection of the first ZCS pattern. The active high hold interval is defined by
LATCH_ERR [addr 046].
Excessive Zeros—Reports one or more long strings of zeros detected on the receiver data
inputs. Depending on bits RZCS [addr 040] and T1/E1N [addr 001], occurrences of 8, 10, or
16 consecutive zeros are detected. EXZ is latched active high upon detection of the first error.
The active high hold interval is defined by LATCH_ERR [addr 046]. If EXZ_LCV [addr 045]
is enabled, EXZ errors are also accumulated in LCV count [addr 054, 055].
Bipolar Violation—Reports one or more bipolar violations detected on the receiver data
inputs. Depending on RZCS [addr 040], BPV may or may not include bipolar violations
received as part of a B8ZS or HDB3 zero code substitution. Detection of BPV or LCV errors
can be selected regardless of whether receive ZCS decoding is enabled [RAMI; addr 040].
BPV is latched active high upon detection of the first error. The active high hold interval is
defined by LATCH_ERR [addr 046]. BPV errors are also accumulated in LCV count [addr
054, 055].
—
6
EXZ
ZCSUB
BPV
0
1
1
1
0
1
1
1
1
0
1
1
T1/E1N.
T1/E1N
X
ZCSUB
0
1
1
X
0
0
1
1
T1/E1N
5
X
0
1
RZCS
RZCS
X
X
0
1
X
0
1
0
1
No ZCS patterns detected
HDB3 pattern detected
B8ZS pattern detected
EXZ
No error
10 consecutive zeros
16 consecutive zeros
8 consecutive zeros
4
No error
All BPVs, including HDB3 coded BPV
Code violation per ITU 0.162 (two consecutive BPVs of
same polarity)
All BPVs, including B8ZS coded BPV
Only BPVs that are not part of B8ZS
Conexant
ZCSUB Status
EXZ Status
BPV
3
BPV Status
3.7 Primary Control and Status Registers
—
2
—
1
3.0 Registers
—
0
3-35