82P2821BH IDT, Integrated Device Technology Inc, 82P2821BH Datasheet - Page 43

• Manufacturer Part Number: 82P2821BH
• Manufacturer: IDT, Integrated Device Technology Inc

Specifications of 82P2821BH

• Number Of Transceivers: 1
• Screening Level: Industrial
• Mounting: Surface Mount
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Lead Free Status / RoHS Status: Not Compliant

3.5
Error Counter, indicated by the respective interrupt bit and indicated by
RMFn or TMFn.
also be implemented.
3.5.1
DETECTION AND BPV INSERTION
3.5.1.1 Bipolar Violation (BPV) / Code Violation (CV) Detection
BPV is detected when the data is AMI coded and CV is detected when
the data is B8ZS/HDB3 coded. If the transmit system interface is in
Transmit Single Rail NRZ Format mode, the BPV/CV detection is
disabled in the transmit path automatically.
are received.
that are not a part of the B8ZS/HDB3 zero substitution are received.
tion LBPV_IS bit (b4, INTS2,...) will be set and an interrupt will be
reported by INT if not masked by the LBPV_IM bit (b4, INTM2,...).
Violation SBPV_IS bit (b5, INTS2,...) will be set and an interrupt will be
reported by INT if not masked by the SBPV_IM bit (b5, INTM2,...).
cated by the RMFn or TMFn pin. Refer to Section 3.5.6 Error Counter
and Section 3.5.7 Receive /Transmit Multiplex Function (RMF / TMF)
Indication respectively.
Functional Description
IDT82P2821
The diagnostic facilities include:
• BPV (Bipolar Violation) / CV (Code Violation) detection and BPV
• EXZ (Excessive Zero) detection;
• LOS (Loss Of Signal) detection;
• AIS (Alarm Indication Signal) detection and generation;
• Pattern generation and detection, including PRBS (Pseudo Ran-
The above defects, alarms or patterns can be counted by an internal
For diagnostic purposes, loopbacks and channel 0 monitoring can
BPV/CV is monitored in both the receive path and the transmit path.
A BPV is detected when two consecutive pulses of the same polarity
A CV is detected when two consecutive BPVs of the same polarity
When BPV/CV is detected in the receive path, the Line Bipolar Viola-
When BPV/CV is detected in the transmit path, the System Bipolar
BPV/CV may be counted by an internal Error Counter or may be indi-
insertion;
dom Bit Sequence), ARB (Arbitrary Pattern) and IB (Inband Loop-
back).
DIAGNOSTIC FACILITIES
BIPOLAR VIOLATION (BPV) / CODE VIOLATION (CV)
21(+1) CHANNEL HIGH-DENSITY T1/E1/J1 LINE INTERFACE UNIT
43
3.5.1.2 Bipolar Violation (BPV) Insertion
to be transmitted by writing a ‘1’ to the BPV_INS bit (b6, ERR,...). This
bit will be reset once BPV insertion is done.
3.5.2
IDT82P2821 provides two standards of EXZ definition for each kind of
line code rule. The standards are ANSI and FCC, as selected by the
EXZ_DEF bit (b7, ERR,...). Refer to Table-16 for details.
Table-16 EXZ Definition
INTS2,...) will be set and an interrupt will be reported by INT if not
masked by the LEXZ_IM bit (b2, INTM2,...).
INTS2,...) will be set and an interrupt will be reported by INT if not
masked by the SEXZ_IM bit (b3, INTM2,...).
Note:
If the transmit system interface is in Transmit Single Rail NRZ Format mode, the EXZ is
detected according to the standard of AMI.
The BPV can only be inserted in the transmit path.
A BPV will be inserted on the next available mark in the data stream
EXZ is monitored in both the receive path and the transmit path.
Different line code has different definition of the EXZ. The
Line Code
When EXZ is detected in the receive path, the LEXZ_IS bit (b2,
When EXZ is detected in the transmit path, the SEXZ_IS bit (b3,
HDB3
B8ZS
Rule
AMI
EXCESSIVE ZEROES (EXZ) DETECTION
An EXZ is detected when
any string of more than 15
consecutive
received.
An EXZ is detected when
any string of more than 7
consecutive
received.
An EXZ is detected when
any string of more than 3
consecutive
received.
ANSI (EXZ_DEF = 0)
‘0’s
‘0’s
‘0’s
Definition
are
are
are
T1/J1 - An EXZ is detected
when any string of more
than 80 consecutive ‘0’s are
received.
E1 - An EXZ is detected
when any string of more
than 15 consecutive ‘0’s are
received.
An EXZ is detected when
any string of more than 7
consecutive
received.
An EXZ is detected when
any string of more than 3
consecutive
received.
FCC (EXZ_DEF = 1)
February 6, 2009
‘0’s
‘0’s
are
are