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參數(shù)資料
| 型號(hào)： | DS21455DK |
| 廠商： | Maxim Integrated Products |
| 文件頁(yè)數(shù)： | 235/269頁(yè) |
| 文件大小： | 0K |
| 描述： | KIT DESIGN FOR DS21458 |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 主要目的： | 電信，線路接口單元（LIU） |
| 已用 IC / 零件： | DS21455，DS21458 |
| 已供物品： | 板，子卡，CD |
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DS21455/DS21458 Quad T1/E1/J1 Transceivers
68 of 269
11.2 Automatic Alarm Generation
The device can be programmed to automatically transmit AIS or remote alarm.
11.2.1 Auto AIS
When automatic AIS generation is enabled (E1TCR2.1 = 1), the device monitors the receive side framer
to determine if any of the following conditions are present: loss of receive frame synchronization, AIS
alarm (all ones) reception, or loss of receive carrier (or signal). If any one (or more) of the above
conditions is present, then the framer will either force an AIS or remote alarm.
11.2.2 Auto RAI
When automatic RAI generation is enabled (E1TCR2.0 = 1), the framer monitors the receive side to
determine if any of the following conditions are present: loss of receive frame synchronization, AIS alarm
(all ones) reception, or loss of receive carrier (or signal) or if CRC-4 multiframe synchronization cannot
be found within 128ms of FAS synchronization (if CRC-4 is enabled). If any one (or more) of the above
conditions is present, then the framer will transmit a RAI alarm. RAI generation conforms to ETS 300
011 specifications and a constant remote alarm will be transmitted if the DS21455/DS21458 cannot find
CRC-4 multiframe synchronization within 400ms as per G.706.
Note: It is an illegal state to have both automatic AIS generation and automatic remote alarm
generation enabled at the same time.
11.2.3 Auto E-Bit
When automatic E-Bit generation is enabled (E1TCR2.2 = 1), and the transmitter is in CRC-4 mode, the
transmitter will automatically set the E-Bit according to the following.
Table 11-2. Auto E-Bit Conditions
CONDITION
E-BIT
STATE
Receive CRC-4 disabled
0
Receive CRC-4 enabled but not synchronized
0
Receive CRC-4 enabled, Synchronized, with CRC Sub Multiframe codeword error
0
Receiver synchronized in CRC-4 mode with no CRC Sub Multiframe codeword errors
1
11.2.4 G.706 CRC-4 Interworking
G.706 Specifies a method to allow automatic interworking between equipment with and without CRC-4
capability. When basic frame alignment is established the device begins searching for the CRC-4
alignment pattern. If after 8ms the CRC-4 alignment is not found, it is assumed that frame alignment was
invalid and the device returns to the basic frame alignment search to establish new frame alignment.
After the new frame alignment is established the device starts a new 8ms search period for CRC-4
alignment. If CRC-4 alignment is found, the device starts CRC-4 performance monitoring and setting of
the transmitted E-bits according to G.706. (See the Auto E-bit section.) If CRC-4 alignment is not
achieved the device continues to return to the basic frame alignment procedure followed by an 8ms
search period for CRC-4. This process continues for 400ms. At the end of this 400ms period, it is
assumed that the far end equipment is non-CRC-4, the search for CRC-4 alignment is terminated and the
E-bits transmitter toward the far end equipment are set continuously = 0. The DS21455/DS21458 provide
a flexible method for implementing this procedure. Once the device is put into the receive CRC-4 mode, a
counter begins to run. The user can access this counter via Information Register 7.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS21455N | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC Quad E1-T1-J1 Transceiver RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| DS21455N+ | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC Quad E1-T1-J1 Transceiver RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| DS21458 | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC Quad E1-T1-J1 Transceiver RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| DS21458+ | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC Quad E1-T1-J1 Transceiver RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| DS21458DK | 功能描述:網(wǎng)絡(luò)開(kāi)發(fā)工具 DS21458 Dev Kit RoHS:否 制造商:Rabbit Semiconductor 產(chǎn)品:Development Kits 類型:Ethernet to Wi-Fi Bridges 工具用于評(píng)估:RCM6600W 數(shù)據(jù)速率:20 Mbps, 40 Mbps 接口類型:802.11 b/g, Ethernet 工作電源電壓:3.3 V |
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