參數(shù)資料
型號： IDT82P20516DBFG
廠商： IDT, Integrated Device Technology Inc
文件頁數(shù)： 41/115頁
文件大?。?/td> 0K
描述： IC LIU T1/E1/J1 16CH SH 484BGA
標(biāo)準(zhǔn)包裝： 84
功能： 線路接口單元（LIU）
接口： E1，J1，T1
電路數(shù)： 16
電源電壓： 1.8V, 3.3V
功率（瓦特）： 2.89W
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 484-LFBGA
供應(yīng)商設(shè)備封裝： 484-CABGA（19x19）
包裝： 托盤
包括： AIS 警報檢測器和發(fā)生器，回送功能，PRBS 發(fā)生器 / 檢測器，遠(yuǎn)程檢測器和發(fā)生器
IDT82P20516
16-CHANNEL SHORT HAUL E1 LINE INTERFACE UNIT
Functional Description
31
December 17, 2009
3.5
DIAGNOSTIC FACILITIES
The diagnostic facilities include:
BPV (Bipolar Violation) / CV (Code Violation) detection and BPV
insertion;
EXZ (Excessive Zero) detection;
LOS (Loss Of Signal) detection;
AIS (Alarm Indication Signal) detection and generation;
Pattern generation and detection, including PRBS (Pseudo Ran-
dom Bit Sequence), ARB (Arbitrary Pattern) and IB (Inband Loop-
back).
The above defects, alarms or patterns can be counted by an internal
Error Counter, indicated by the respective interrupt bit.
3.5.1
BIPOLAR VIOLATION (BPV) / CODE VIOLATION (CV)
DETECTION AND BPV INSERTION
3.5.1.1 Bipolar Violation (BPV) / Code Violation (CV) Detection
BPV/CV is monitored in both the receive path and the transmit path.
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.
A BPV is detected when two consecutive pulses of the same polarity
are received.
A CV is detected when two consecutive BPVs of the same polarity
that are not a part of the B8ZS/HDB3 zero substitution are received.
When BPV/CV is detected in the receive path, the Line Bipolar Viola-
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,...).
When BPV/CV is detected in the transmit path, the System Bipolar
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,...).
3.5.1.2 Bipolar Violation (BPV) Insertion
The BPV can only be inserted in the transmit path.
A BPV will be inserted on the next available mark in the data stream
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
EXCESSIVE ZEROES (EXZ) DETECTION
EXZ is monitored in both the receive path and the transmit path.
Different line code has different definition of the EXZ. The
IDT82P20516 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-9 for details.
When EXZ is detected in the receive path, the LEXZ_IS bit (b2,
INTS2,...) will be set and an interrupt will be reported by INT if not
masked by the LEXZ_IM bit (b2, INTM2,...).
Table-9 EXZ Definition
Line Code
Rule
Definition
ANSI (EXZ_DEF = 0)
FCC (EXZ_DEF = 1)
AMI
An EXZ is detected when
any string of more than 15
consecutive
‘0’s
are
received.
E1 - An EXZ is detected
when any string of more
than 15 consecutive ‘0’s are
received.
B8ZS
An EXZ is detected when
any string of more than 7
consecutive
‘0’s
are
received.
An EXZ is detected when
any string of more than 7
consecutive
‘0’s
are
received.
HDB3
An EXZ is detected when
any string of more than 3
consecutive
‘0’s
are
received.
An EXZ is detected when
any string of more than 3
consecutive
‘0’s
are
received.
Note:
If the transmit system interface is in Transmit Single Rail NRZ Format mode, the EXZ is
detected according to the standard of AMI.
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