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參數資料
| 型號： | IDT82P20416DBFG |
| 廠商： | IDT, Integrated Device Technology Inc |
| 文件頁數： | 61/121頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC LIU T1/E1/J1 16CH SH 484BGA |
| 標準包裝： | 84 |
| 功能： | 線路接口單元（LIU） |
| 接口： | E1，J1，T1 |
| 電路數： | 16 |
| 電源電壓： | 1.8V, 3.3V |
| 功率（瓦特）： | 3.10W |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 484-LFBGA |
| 供應商設備封裝： | 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，遠程檢測器和發(fā)生器 |
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IDT82P20416
16-CHANNEL SHORT HAUL T1/E1/J1 LINE INTERFACE UNIT
Functional Description
44
December 17, 2009
3.5.7.3 Digital Loopback
The Digital Loopback can be configured manually or automatically.
Either manual Digital Loopback configuration or automatic Digital Loop-
back configuration will enable Digital Loopback.
Manual Digital Loopback is enabled by the DLP bit (b2, LOOP,...).
Automatic Digital Loopback is enabled when the pattern detection is
assigned in the transmit path (i.e., the PD_POS bit (b3, PD,...) is ‘1’) and
the AUTOLP bit (b3, LOOP,...) is ‘1’. The corresponding channel will
enter Digital Loopback when the activate IB code is detected in the
transmit path for more than 5.1 sec.; and will return from Digital Loop-
back when the deactivate IB code is detected in the transmit path for
more than 5.1 sec. Refer to section Inband Loopback (IB) Detection on
page 40 for details. When automatic Digital Loopback is active, setting
the AUTOLP bit (b3, LOOP,...) back to ‘0’ will also stop automatic Digital
Loopback. The setting of the PD_POS bit (b3, PD,...) should not be
changed during automatic Digital Loopback. The AUTOLP_S bit (b7,
STAT0,...) indicates the automatic Digital Loopback status.
In Digital Loopback mode, the data stream output from the TJA (if
enabled) is internally looped to the Decoder (if enabled). The data
stream to be transmitted is still output to the line side, while the data
stream received from the line side is covered by the Digital Loopback
data. However, LLOS and AIS detection in the receive path still monitors
the data stream received from the line side.
In Digital Loopback mode, the priority of the diagnostic facilities in the
receive path is: pattern generation > looped data; the priority of the diag-
nostic facilities in the transmit path is: pattern generation > looped data >
AIS generation. AIS generation is disabled in the receive path.
Figure-27 Priority Of Diagnostic Facilities During Digital Loopback
Tx path
BPV/CV, EXZ,
SLOS, AIS, pattern
detection
Pattern generation
Auto AIS
generation
Rx path
LLOS, AIS
detection
AIS generation
X
BPV/CV, EXZ,
AIS, pattern
detection
Pattern generation
Digital
Loopback
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