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| 型號： | SI2400URT-EVB |
| 廠商： | Silicon Laboratories Inc |
| 文件頁數(shù)： | 10/94頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVAL FOR SI2400 ISOMODEM |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | ISOmodem® |
| 主要目的： | 電信，調(diào)制解調(diào)器 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | SI2400 |
| 主要屬性： | 雙路 RJ-11 連接至電話線路，音頻連接器 |
| 次要屬性： | RS-232，TTL 串行和 USB 接口 |
| 已供物品： | 板，調(diào)制解調(diào)器，電源 |
| 相關(guān)產(chǎn)品： | SI2400-BS-ND - IC ISOMODEM SYSTEM-SIDE 16SOIC SI2400-FS-ND - IC ISOMODEM SYST-SIDE DAA 16SOIC 336-1093-ND - IC ISOMODEM SYSTEM-SIDE 16SOIC |
| 其它名稱： | 336-1166 |
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Si2400
18
Rev. 1.3
5.5. Parallel Phone Detection
The Si2400 has the ability to detect a phone or other
device that is off hook on a shared line. This enables the
ISOmodem to avoid interrupting a call in progress on a
shared line and to intelligently handle an interruption by
another device when the Si2400 is using the line. An
automatic algorithm to detect parallel phone intrusion
(defined as an off-hook parallel handset) is provided by
default.
5.5.1. On-Hook Intrusion Detection
To implement intrusion detection, the Si2400 uses loop
voltage sense register SDB (LVCS). When on hook,
LVCS monitors the line voltage. (When off-hook, it
measures line current.) LVCS has a full scale of 87 V
with an LSB of 2.75 V. The first code (0
→ 1) is skewed
such that a 0 indicates that the line voltage is < 3.0 V.
The voltage accuracy of LVCS is ±20%. The user can
read these bits directly when on hook through register
SDB (LVCS).
The automatic on-hook detector algorithm can be
tripped by either an absolute level or by a voltage
differential
by
selecting
S13[3] (ONHD) = 0b
for
absolute or S13[3] (ONHD) = 1b for differential. If the
absolute detector is chosen, the Si2400 algorithm will
detect an intrusion if LVCS is less than the value stored
in on-hook intrusion threshold, S11[4:0] (AVL). In other
words, an intrusion has occurred if LVCS < AVL.
AVL defaults to 1000b, or 25 V on powerup. The
absolute detector is the correct method to use for most
countries and should also be used to detect the
presence (or absence) of a line connection.
Under the condition of a very short line and a current-
limiting telephone off hook, the off-hook line voltage can
be as high as 40 V. The minimum on-hook voltage may
not be much greater. This condition can occur on phone
lines with current-limiting specifications such as France.
For
these
lines,
a
differential
detector
is
more
appropriate.
The differential detector method checks line status
every 26.66 ms. The detector compares (LVCS (t –
0.02666) – LVCS (t)) to the differential threshold level
set in register S11[7:5] (DVL). The default for DVL is
0x02 (5.5 V). If the threshold is exceeded (LVCS (t –
0.02666) – LVCS (t) > DVL), an intrusion is detected. If
(LVCS (t) – LVCS (t – 0.02666) > DVL), then the
intrusion is said to have terminated.
Figure 7. Loop Voltage—LVCS Transfer Function
0
3
6
9 121518 212428 30 333639 42 45 4751 5457 6063666972
100
0
5
75 78 81 84 87
LVC S
BIT S
Loop Voltage (V)
10
15
20
25
30
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SI2401 | 制造商:SILABS 制造商全稱:SILABS 功能描述:V.22BIS ISOMODEM㈢ WITH LOW-COST DAA |
| SI2401-C-FS | 制造商:Silicon Laboratories Inc 功能描述: |
| SI2401DC-EVB | 功能描述:子卡和OEM板 SI2401 Daughter Card RoHS:否 制造商:BeagleBoard by CircuitCo 產(chǎn)品:BeagleBone LCD4 Boards 用于:BeagleBone - BB-Bone - Open Source Development Kit |
| SI2401-FS | 功能描述:電信線路管理 IC 2400b/s System Side 3rd Gen DAA Tech RoHS:否 制造商:STMicroelectronics 產(chǎn)品:PHY 接口類型:UART 電源電壓-最大:18 V 電源電壓-最小:8 V 電源電流:30 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VFQFPN-48 封裝:Tray |
| Si2401FS08-EVB | 功能描述:網(wǎng)絡(luò)開發(fā)工具 Si2401+Si3008 ISO modem Eval Board RoHS:否 制造商:Rabbit Semiconductor 產(chǎn)品:Development Kits 類型:Ethernet to Wi-Fi Bridges 工具用于評估: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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