Last modified by Kilight Cao on 2024/12/31 16:31
<
From version < 119.1 >
edited by Kilight Cao
on 2022/12/30 09:23
To version < 83.4 >
edited by Xiaoling
on 2022/08/23 10:01
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Summary

Details

Page properties
Author
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1 -XWiki.Kilight
1 +XWiki.Xiaoling
Content
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16 16  
17 17  
18 18  
19 -= 1. Introduction =
19 += **1. Introduction** =
20 20  
21 -== 1.1 What is LPS8v2 ==
22 22  
22 +== **1.1 What is LPS8v2** ==
23 23  
24 +
24 24  (((
25 25  (((
26 26  The LPS8v2 is an (% style="color:green" %)**open-source LoRaWAN Gateway**(%%). It lets you bridge LoRa wireless network to an IP network via (% style="color:green" %)**WiFi , Ethernet or Cellular Network**(%%) (via Optional 4G module). The LoRa wireless allows users to send data and reach extremely long ranges at low data rates.
... ... @@ -43,9 +43,10 @@
43 43  )))
44 44  
45 45  
46 -== 1.2 Specifications ==
47 47  
48 +== **1.2 Specifications** ==
48 48  
50 +
49 49  (% style="color:#037691" %)**Hardware System:**
50 50  
51 51  * CPU: Quad-core Cortex-A7 1.2Ghz
... ... @@ -66,7 +66,7 @@
66 66  
67 67  
68 68  
69 -== 1.3 Features ==
71 +== **1.3 Features** ==
70 70  
71 71  
72 72  * Open Source Debian system
... ... @@ -86,11 +86,11 @@
86 86  
87 87  
88 88  
89 -== 1.4 Block Diagram ==
91 +== **1.4 Block Diagram** ==
90 90  
91 91  
92 92  
93 -== 1.5 LED Indicators ==
95 +== **1.5 LED Indicators** ==
94 94  
95 95  
96 96  LPS8-V2 has totally four LEDs, They are:
... ... @@ -98,48 +98,35 @@
98 98  
99 99  (% style="color:blue" %)//**➢ Power LED**//(%%)//: This RED LED will be solid if the device is properly powered//
100 100  
101 -(% style="color:blue" %)//**➢ ETH LED**//(%%)//:  This RGB LED will blink GREEN when the ETH port is connecting//
103 +(% style="color:blue" %)//**➢ LoRa LED**//(%%)//: This RGB LED will blink GREEN when the LoRaWAN module starts or transmit a packet//
102 102  
103 -(% style="color:blue" %)//**➢ SYS LED**//(%%)//:  This RGB LED will show different colors in different states~://
105 +(% style="color:blue" %)//**➢ SYS LED**//(%%)//: This RGB LED will show different colors in different states~://
104 104  
105 -// ✓ **SOLID GREEN:** The device is alive with a LoRaWAN server connection.//
107 +// ✓ **SOLID BLUE:** The device is alive with a LoRaWAN server connection.//
106 106  
107 -// ✓ **BLINKING GREEN:** a) Device has internet connection but no LoRaWAN Connection. or b) Device is in booting stage, in this stage, it will BLINKING GREEN for several seconds and then with BLINKING GREEN together//
109 +// ✓ **BLINKING BLUE:** a) Device has internet connection but no LoRaWAN Connection. or b) Device is in booting stage, in this stage, it will BLINKING BLUE for several seconds and then with SOLID RED and BLINKING BLUE together//
108 108  
109 109  // ✓** SOLID RED:** Device doesn't have an Internet connection.//
110 110  
111 -(% style="color:blue" %)//**➢ WIFI LED**//(%%)//: This LED shows the WIFI interface connection status.//
113 +(% style="color:blue" %)//**➢ ETH LED**//(%%)//: This LED shows the ETH interface connection status.//
112 112  
113 113  
114 -== 1.6 Button Intruction ==
115 115  
117 += **2. Quick Start** =
116 116  
117 -LPS8-V2 has a black toggle button, which is:
118 118  
119 -
120 -(% style="color:blue" %)**//➢ //Long press 4-5s  : **(%%)the gateway will reload the Network and Initialize wifi configuration
121 -
122 - // **LED status: ** ETH LED will BLINKIND BULE Until the reload is finished.//
123 -
124 -
125 -(% style="color:blue" %)//**➢ **//**Long press more than 10s:**(%%)**    **//the gateway will restore the factory settings.//
126 -
127 - //**LED status: ** ETH LED will SOLID BULE Until the restore is finished.//
128 -
129 -
130 -= 2. Quick Start =
131 -
132 -
133 133  The LPS8-V2 supports network access via Ethernet or Wi-Fi connection and runs without a network.
134 134  
135 135  In most cases, the first thing you need to do is make the lps8-v2 accessible to the network.
136 136  
137 137  
138 -== 2.1 Connects to the network and accesses the gateway Web UI ==
139 139  
140 -== 2.1.1 connect the network ==
126 +== **2.1 Connects to the network and accesses the gateway Web UI** ==
141 141  
142 142  
129 +== **2.1.1 connect the network.** ==
130 +
131 +
143 143  === (% style="color:blue" %)**Method 1**(%%):  Connect via Ethernet with DHCP IP from the router ===
144 144  
145 145  
... ... @@ -161,6 +161,28 @@
161 161  [[image:image-20220622100542-2.png||height="369" width="1256"]]
162 162  
163 163  
153 +(((
154 +The LPS8-V2 has a fall-back IP address on its WAN port. you have to access the gateway Web-UI to configure the WiFi connection via the fallback IP address.
155 +)))
156 +
157 +
158 +
159 +(% style="color:#037691" %)**Steps to connect via fallback IP:**
160 +
161 +~1. Connect PC's Ethernet port to LPS8-V2's WAN port
162 +
163 +2. Configure PC's Ethernet port has  IP: 172.31.255.253 and Netmask: 255.255.255.252
164 +
165 +
166 +[[image:image-20220622101433-4.png]]
167 +
168 +
169 +and then On the PC, use the IP address **http:~/~/172.31.255.254** to access the LPS8-V2 via Web or Console.
170 +
171 +
172 +[[image:image-20220622102210-5.png||height="569" width="1039"]]
173 +
174 +
164 164  Fill in the WiFi information by checking the box and clicking (% style="color:red" %)**Save&Apply**
165 165  
166 166  
... ... @@ -174,14 +174,16 @@
174 174  [[image:image-20220622102847-7.png]]
175 175  
176 176  
177 -[[image:image-20220622102901-8.png||height="476" width="938"]]
188 +[[image:image-20220622102901-8.png||height="513" width="1011"]]
178 178  
179 179  
180 -== 2.2 The LPS8-V2 is registered and connected to The Things Network ==
181 181  
182 -=== 2.2.1 Select your area frequency ===
192 +== **2.2 The LPS8-V2 is registered and connected to The Things Network** ==
183 183  
184 184  
195 +=== **2.2.1 Select your area frequency** ===
196 +
197 +
185 185  (((
186 186  First, you need to set the frequency plan in LPS8-V2 to match the end node we use, so to receive the LoRaWAN packets from the LoRaWAN sensor.
187 187  
... ... @@ -188,16 +188,17 @@
188 188  
189 189  )))
190 190  
191 -[[image:image-20220622103332-9.png||height="485" width="938"]]
204 +[[image:image-20220622103332-9.png]]
192 192  
193 193  
194 -=== 2.2.2 Get the only gateway EUI ===
195 195  
208 +=== **2.2.2 Get the only gateway EUI** ===
196 196  
210 +
197 197  Every LPS8-V2 has a unique gateway id. The ID can be found on LoRaWAN Semtech page:
198 198  
199 199  
200 -[[image:image-20220622103355-10.png||height="698" width="949"]]
214 +[[image:image-20220622103355-10.png]]
201 201  
202 202  
203 203  (% style="color:red" %)**Note: Choose the cluster that corresponds to a specific Gateway server address**
... ... @@ -215,9 +215,10 @@
215 215  [[image:image-20220622103956-12.png]]
216 216  
217 217  
218 -== 2.2.3 Register the gateway to The Things Network ==
219 219  
233 +== **2.2.3 Register the gateway to The Things Network** ==
220 220  
235 +
221 221  **Login to The Things Network**
222 222  
223 223  [[https:~~/~~/console.cloud.thethings.network/>>https://console.cloud.thethings.network/]]
... ... @@ -231,21 +231,23 @@
231 231  **Get it online**
232 232  
233 233  
234 -= 3. Web Configure Pages =
235 235  
236 -== 3.1 Home ==
250 += **3. Web Configure Pages** =
237 237  
238 238  
253 +== **3.1 Home** ==
254 +
255 +
239 239  //Shows the system running status~://
240 240  
241 -[[image:http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20All%20Gateway%20models/HP0C/WebHome/image-20220622102901-8.png?rev=1.1||alt="image-20220622102901-8.png" height="476" width="939"]]
242 242  
243 243  
244 -== 3.2 LoRa Settings ==
260 +== **3.2 LoRa Settings** ==
245 245  
246 -=== 3.2.1 LoRa ~-~-> LoRa ===
247 247  
263 +=== **3.2.1 LoRa ~-~-> LoRa** ===
248 248  
265 +
249 249  //This page shows the LoRa Radio Settings. There is a set of default frequency bands according to LoRaWAN protocol, and users can customize the band* as well.//
250 250  
251 251  //Different LPS8v2 hardware versions can support different frequency ranges~://
... ... @@ -262,15 +262,17 @@
262 262  
263 263  
264 264  (((
265 -(% style="color:red" %)//**Note *: See this instruction for how to customize the frequency band: **//(%%)**//__[[How to customized LoRaWAN frequency band - DRAGINO>>doc:Main.How to customized LoRaWAN frequency band.WebHome]]__//**
282 +(% style="color:red" %)//**Note *: See this instruction for how to customize the frequency band: **//(%%)**//__[[How to customized LoRaWAN frequency band - DRAGINO>>url:http://8.211.40.43/xwiki/bin/view/Main/How%20to%20customized%20LoRaWAN%20frequency%20band/]]__//**
266 266  )))
267 267  
268 268  
269 -== 3.3 LoRaWAN Settings ==
270 270  
271 -=== 3.3.1 LoRaWAN ~-~-> LoRaWAN Semtech UDP ===
287 +== **3.3 LoRaWAN Settings** ==
272 272  
273 273  
290 +=== **3.3.1 LoRaWAN ~-~-> LoRaWAN Semtech UDP** ===
291 +
292 +
274 274  //This page is for the connection set up to a general LoRaWAN Network server such as [[TTN>>url:http://www.thethingsnetwork.org/]], [[ChirpStack>>url:https://www.chirpstack.io/]], etc.//
275 275  
276 276  
... ... @@ -277,9 +277,10 @@
277 277  [[image:image-20220616111932-2.png||height="516" width="672"]]
278 278  
279 279  
280 -=== 3.3.2 LoRaWAN ~-~-> LoRaWAN Basic Station ===
281 281  
300 +=== **3.3.2 LoRaWAN ~-~-> LoRaWAN Basic Station** ===
282 282  
302 +
283 283  //This page is for the connection set up to the TTN Basic Station, AWS-IoT, etc.//
284 284  
285 285  
... ... @@ -287,53 +287,59 @@
287 287  
288 288  
289 289  (((
290 -Please see this instruction to know more detail and a demo for how to use of LoRaWAN Basic Station: __[[Use of LoRaWAN Basic Station - DRAGINO>>doc:Main.Use of LoRaWAN Basic Station.WebHome]]__
310 +Please see this instruction to know more detail and a demo for how to use of LoRaWAN Basic Station: __[[Use of LoRaWAN Basic Station - DRAGINO>>url:http://8.211.40.43/xwiki/bin/view/Main/Use%20of%20LoRaWAN%20Basic%20Station/]]__
291 291  )))
292 292  
293 293  
294 -== 3.4 Network Settings ==
295 295  
296 -=== 3.4.1 Network ~-~-> WiFi ===
315 +== **3.4 Network Settings** ==
297 297  
298 298  
318 +=== **3.4.1 Network ~-~-> WiFi** ===
319 +
320 +
299 299  [[image:image-20220616114756-4.png||height="251" width="669"]]
300 300  
301 301  
302 -=== 3.4.2 Network ~-~-> System Status ===
303 303  
325 +=== **3.4.2 Network ~-~-> System Status** ===
304 304  
327 +
305 305  [[image:image-20220820134112-2.png||height="539" width="668"]]
306 306  
307 307  
308 -=== 3.4.3 Network ~-~-> Firewall ===
309 309  
332 +=== **3.4.3 Network ~-~-> Firewall** ===
310 310  
334 +
311 311  [[image:image-20220616115351-6.png||height="244" width="661"]]
312 312  
313 313  
314 -== 3.5 System ==
315 315  
316 -=== 3.5.1  System ~-~-> System Overview ===
339 +== **3.5 System** ==
317 317  
318 318  
342 +=== **3.5.1  System ~-~-> System Overview** ===
343 +
344 +
319 319  Shows the system info:
320 320  
321 -[[image:image-20220917144512-5.png||height="618" width="853"]]
322 322  
323 323  
324 -=== 3.5.2 System ~-~-> Backup/Restore ===
349 +=== **3.5.2 System ~-~-> Backup/Restore** ===
325 325  
326 326  
327 -[[image:image-20220917144725-6.png||height="208" width="869"]]
352 +[[image:image-20220616115808-7.png||height="194" width="649"]]
328 328  
329 329  
330 -= 4. Build-in Server =
331 331  
356 += **4. Build-in Server** =
332 332  
358 +
333 333  The default factory version of LPS8-V2 is installed with the built-in Applicant server: (% style="color:blue" %)**Node-Red, and**(%%) LoRaWAN Server: (% style="color:blue" %)**The Things Network - Stack (Open Source 3.19 Version).**
334 334  
335 335  
336 -[[image:image-20220820115644-1.png||height="217" width="778"]]
362 +[[image:image-20220820115644-1.png]]
337 337  
338 338  
339 339  (% style="color:red" %)**Note:**
... ... @@ -346,16 +346,17 @@
346 346  
347 347  **~ 1. URL does not jump properly**
348 348  
349 - For the ttn-stack, you can click the update the URL which will update the configuration where change the hostname to the current local IP address as the URL.
375 + For the ttn-stack, you can click the update the URL which will update the configuration where change the hotsname to the current local IP address as the URL.
350 350  
351 - For the Node-Red, you can use the local IP address and the port is 1880 to access it.
377 + For the Node-Red, you can use the local IP address and the port is 18880 to access it.
352 352  
353 353  
354 -== 4.1 LoRaWAN Network  Server ~-~- The Things Network - Stack (TTN-V3) ==
355 355  
381 +== **4.1 LoRaWAN Network  Server ~-~- The Things Network - Stack (TTN-V3)** ==
356 356  
357 -You can access the gateway's built-in LNS server of (% style="color:blue" %)**The Things Network - Stack **(%%)via the URL( (% style="background-color:yellow" %)__**//http:~/~/<hostname>:8080 or http:~/~/<local-IPV4-address> //**__(%%)) in your browser.
358 358  
384 +You can access the gateway's built-in LNS server of **The Things Network - Stack **via the URL( (% style="background-color:yellow" %)__**//http:~/~/<hostname>:8080 or http:~/~/<local-IPV4-address> //**__(%%)) in your browser.
385 +
359 359  Such as  (% style="background-color:yellow" %)__**//http:~/~/dragino-54ff12:8080  or http:~/~/<Local-IPV4-Address>//**__
360 360  
361 361  
... ... @@ -369,44 +369,34 @@
369 369  [[image:image-20220725171719-1.png||height="570" width="769"]]
370 370  
371 371  
372 -== 4.2 Application Server ~-~- Node-Red ==
373 373  
400 +== **4.2. Application Server ~-~- Node-Red** ==
374 374  
375 -You can access the gateway's built-in AS server of (% style="color:blue" %)**Node-Red **(%%)via the URL((% style="background-color:yellow" %)__**//http:~/~/<hostname>:1880 or http:~/~/<local-IPV4-address>//**__(%%)) in your browser.
376 376  
403 +You can access the gateway's built-in AS server of **Node-Red **via the URL((% style="background-color:yellow" %)__**//http:~/~/<hostname>:8080 or http:~/~/<local-IPV4-address>//**__(%%)) in your browser.
377 377  
378 -Such as (% style="background-color:yellow" %)__**//http:~/~/dragino-54ff12:1880  or http:~/~/<Local-IPV4-Address>//**__
379 379  
406 +Such as (% style="background-color:yellow" %)__**//http:~/~/dragino-54ff12:8080  or http:~/~/<Local-IPV4-Address>//**__
380 380  
408 +
381 381  [[image:image-20220725172124-3.png||height="610" width="843"]]
382 382  
383 383  
384 384  
385 -=== **Using Node-Red, InfluxDB and Grafana** ===
413 += **6. How users can access LPS8v2 using serial USB** =
386 386  
387 -The LPS8-V2 supports this combination, the default, Node-red is pre-installed but the InfluxDB and Grafana is not pre-installed.
388 388  
416 +**USB TTL to LPS8v2  Connection:**
389 389  
390 -the users can refer to this link to install them.
391 -
392 -[[http:~~/~~/wiki.dragino.com/xwiki/bin/view/Main/Armbian%20OS%20instruction/#H2.6HowtoinstallGrafanaandinfluxdb>>http://wiki.dragino.com/xwiki/bin/view/Main/Armbian%20OS%20instruction/#H2.6HowtoinstallGrafanaandinfluxdb]]
393 -
394 -
395 -= 5. How users can access LPS8v2 using serial USB =
396 -
397 -
398 -(% style="color:blue" %)**USB TTL to LPS8v2  Connection:**
399 -
400 -
401 401  Port 1 of the UART on the LPS8v2 is GND
402 402  
403 403  (% class="box infomessage" %)
404 404  (((
405 -**TXD  <~-~--> UART RXD (Gray line)**
422 +TXD  <~-~--> UART RXD (Gray line)
406 406  
407 -**RXD  <~-~--> UART TXD (White line)**
424 +RXD  <~-~--> UART TXD (White line)
408 408  
409 -**GND <~-~--> GND (Black line)**
426 +GND <~-~--> GND (Black line)
410 410  )))
411 411  
412 412  
... ... @@ -425,133 +425,11 @@
425 425  [[image:image-20220804164747-2.png||height="622" width="594"]]
426 426  
427 427  
428 -= 6. Use the helium gateway-rs as the Data-only Hotspot =
429 429  
446 +(% style="color:inherit; font-family:inherit; font-size:29px" %)**10. Supports**
430 430  
431 -== **Step 1: Configure Frequency Band** ==
432 432  
433 -
434 -//Each country has a requirement for frequency region. Choose the right one for your area.//
435 -
436 -[[image:image-20220905164308-1.png]]
437 -
438 -
439 -
440 -== **Step 2: Configure the forward address** ==
441 -
442 -
443 -**Select one of the servers to configure.**
444 -
445 -**For example:**
446 -
447 -[[image:image-20220905164847-2.png]]
448 -
449 -
450 -
451 -== **Step 3: Download and Install the Helium-gateway-rs** ==
452 -
453 -
454 -**Access the gateway CLI via SSH.**
455 -
456 -[[image:image-20220905165222-3.png]]
457 -
458 -
459 -**Download gateway-rs.**
460 -
461 -[[image:image-20220905165715-5.png]]
462 -
463 -(% class="box infomessage" %)
464 464  (((
465 -**Command: wget [[http:~~/~~/repo.dragino.com/release/tool/gateway-rs/helium-gateway-v1.0.0-alpha.31-raspi234.deb>>http://repo.dragino.com/release/tool/gateway-rs/helium-gateway-v1.0.0-alpha.31-raspi234.deb]]**
466 -)))
467 -
468 -
469 -**Install gateway-rs.**
470 -
471 -[[image:image-20220905165917-7.png]]
472 -
473 -(% class="box infomessage" %)
474 -(((
475 -**Command: dpkg -i helium-gateway-v1.0.0-alpha.31-raspi234.deb **
476 -)))
477 -
478 -
479 -**Modify configuration.**
480 -
481 -
482 -[[image:image-20220905173847-12.png]]
483 -
484 -
485 -(% class="box infomessage" %)
486 -(((
487 -**region=<Enter regional parameters> \
488 -&& sed -i '/region/d' /etc/helium_gateway/settings.toml && sed -i "1 i\region = \"$region\"" /etc/helium_gateway/settings.toml \
489 -&& sed -i '/region/d' /etc/helium_gateway/default.toml && sed -i "22 i\region = \"$region\"" /etc/helium_gateway/default.toml**
490 -)))
491 -
492 -
493 -**Restart the helium_gateway**
494 -
495 -[[image:image-20220905170920-9.png]]
496 -
497 -
498 -(% class="box infomessage" %)
499 -(((
500 -**systemctl restart helium_gateway**
501 -)))
502 -
503 -
504 -**Check the helium_gateway Log：**
505 -
506 -[[image:image-20220905173952-13.png]]
507 -
508 -
509 -(% class="box infomessage" %)
510 -(((
511 -**journalctl -u helium_gateway -f**
512 -)))
513 -
514 -
515 -(% style="color:red" %)**Note: if your device is not finished the onboarding, which is unable to connect to the Helium console.**
516 -
517 -where the helium gateway log is shown:
518 -
519 -[[image:image-20220905174534-14.png]]
520 -
521 -
522 -So you have to finish the onboarding, ~-~--Please refer to [[Step 2.7>>doc:Main.Notes for Helium.WebHome||anchor="H2.7A0Step6:OnboardingData-OnlyHotspot"]] to onboarding your LPS8-V2.
523 -
524 -
525 -= 7. OTA System Update =
526 -
527 -
528 -LPS8v2 supports system auto update via OTA, please see **[[this URL>>url:http://wiki.dragino.com/xwiki/bin/view/OTA%20Update/]]** for the detail of this feature.
529 -
530 -
531 -= 8. Trouble Shooting =
532 -
533 -== 8.1  I can't log in to the built-in Server TTN Stack which shows '**Login failed**'. ==
534 -
535 -
536 -[[image:image-20220920135918-1.png]]
537 -
538 -
539 -This is caused by the inconsistency between the built-in TTN-Stack domain configuration and your login URL.
540 -
541 -By default, ttn-stack uses the gateway's domain name for URL resolution, but in some networks, they prefer to resolve IP-v4 addresses.
542 -
543 -
544 -So you can change the domain name of the TTN-Stack configuration to the IPv4 address.
545 -
546 -**Click the update URL button to configure the URL with the current eth port address.**
547 -
548 -[[image:image-20220920141936-2.png]]
549 -
550 -
551 -= (% style="color:inherit; font-family:inherit; font-size:29px" %)9. Supports(%%) =
552 -
553 -
554 -(((
555 555  **//If you are experiencing issues and can't solve them, you can send mail to [[support@dragino.com>>mailto:support@dragino.com]].//**
556 556  )))
557 557  
... ... @@ -559,17 +559,19 @@
559 559  **//With your question as detailed as possible. We will reply and help you in the shortest.//**
560 560  
561 561  
562 -= 10. Reference =
563 563  
458 += **11 Reference** =
564 564  
460 +
565 565  * Install Tago Core: Refer **Install Tago Core in LPS8v2** in[[ Instruction>>doc:Main.Tago\.IO.WebHome]].
566 566  * [[Advance OS Reference Guide for LPS8v2>>doc:Main.Armbian OS instruction.WebHome]].
567 567  
568 568  
465 +
569 569  
570 570  )))
571 571  
572 -= 11. Order Info =
469 += **12. Order Info** =
573 573  
574 574  
575 575  (% style="color:#0000ff" %)**LPS8v2-XXX-YYY**
... ... @@ -593,9 +593,10 @@
593 593  More info about valid bands, please see [[EC25-E product page>>url:https://www.quectel.com/product/ec25.htm]].
594 594  
595 595  
596 -= 12. Manufacturer Info =
597 597  
494 += **13. Manufacturer Info** =
598 598  
496 +
599 599  **Shenzhen Dragino Technology Development co. LTD**
600 600  
601 601  Room 202, Block B, BCT Incubation Bases (BaoChengTai),  No.8 CaiYunRoad
... ... @@ -603,9 +603,10 @@
603 603  LongCheng Street, LongGang District ; Shenzhen 518116,China
604 604  
605 605  
606 -= 13. FCC Warning =
607 607  
505 += **14. FCC Warning** =
608 608  
507 +
609 609  (((
610 610  This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:
611 611  )))
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