82V2048DA IDT, Integrated Device Technology Inc, 82V2048DA Datasheet - Page 16

• Manufacturer Part Number: 82V2048DA
• Manufacturer: IDT, Integrated Device Technology Inc

Specifications of 82V2048DA

• Screening Level: Industrial
• Mounting: Surface Mount
• Package Type: TQFP
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Lead Free Status / RoHS Status: Not Compliant

Table-7 AIS Condition
IDT82V2048 OCTAL T1/E1 SHORT HAUL LINE INTERFACE UNIT
Table-8 Error Detection
2.4.6.1 BPV DETECTION AND REPORTING IN AMI LINE CODING
represent logical values. A logic 0 is represented by no symbol and a
logic 1 by pulses of alternating polarity. In AMI line coding, marks
2.4.6.2 EXZ AND BPV DETECTION IN HDB3
consecutive zeros while maintaining DC balance. HDB3 encoder will
encode any 4 consecutive zeros as 000V or B00V where V is a bipolar
violation and B is a balancing pulse that is opposite in polarity to the
previous V. If there is an odd number of B pulses since the last V, then
the four consecutive zeros will be substituted as 000V. If there is an even
number of B pulses since the last V, then B00V substitution is chosen.
The HDB3 decoder, once receiving correctly encoded 000V or B00V, will
automatically restore the pattern back into 4 consecutive zeros.
consecutive zeros.
AIS Detected
Line Code
AIS Cleared
AMI stands for Alternative Mark Inversion. It uses bipolar pulses to
The purpose of HDB3 is to prevent transmission of more than 3
HDB3 decoder will report an EXZ (excessive zero) when it receives 4
B8ZS/
HDB3
AMI
Hardware Mode
Bipolar Violation +
Less than 3 zeros contained in each of two
consecutive 512-bit stream are received
3 or more zeros contained in each of two
consecutive 512-bit stream are received
Pin CVn Reports
Bipolar Violation
Code Violation
(Register LAC defaulted to ‘0’)
ITU G.775 for E1
RRINGn
RCLKn
RTIPn
RDn
CVn
1
B8ZS/HDB3
Line Code
AMI
2
Figure-7 AMI Bipolar Violation
CODVn in e-CODV CZERn in e-CZER
Less than 3 zeros contained in a 512-bit
stream are received
3 or more zeros contained in a 512-bit
stream are received
3
1
Bipolar Violation
4
(Register LAC set to ‘1’)
0
0
1
1
-
ETSI 300 233 for E1
2
5
16
(pulses) are transmitted or received alternatively on tip and ring. If a
mark (pulse) is transmitted or received in the same polarity as the prior
mark (pulse), it is a bipolar violation.
that has the same polarity as the previous non-zero signal element.
zeros in HDB3 line coding, depends on the number of alternate ones
between two consecutive ‘V’ (code violation) in the input data pattern. If
the number of alternate ones between two consecutive violations is an
odd number, no violation detection is reported. In
there is one code violation detection for two 000V patterns. It can be
inferred that in Figure-8, there is another code violation prior to the first
000V pattern, and the number of alternate pulses between these two
violations is an odd number.
is an even number, there is a code violation reported for 000V as in
Figure-9.
Bipolar violation (BPV) is a non-zero signal element in an AMI signal
The detection of code violation in 000V, coded for 4 consecutive
Conversely, if the number of alternate pulses between two violations
3
V
0
1
0
1
4
-
Host Mode
6
Bipolar Violation detected
5
Less than 9 zeros contained in a 8192-bit stream (a ones
density of 99.9% over a period of 5.3 ms) are received
9 or more zeros contained in a 8192-bit stream are
received
Bipolar Violation + Code Violation + Excessive Zeros
7
INDUSTRIAL TEMPERATURE RANGES
V
Bipolar Violation + Excessive Zeros
Bipolar Violation + Code Violation
6
ANSI T1.231 for T1
Pin CVn Reports
Bipolar Violation
Bipolar Violation
Figure-8
input pattern,