n $r;
}

// 版块版主权限判断: allowtop, allowmove, allowupdate, allowdelete, allowbanuser, allowviewip, allowdeleteuser
function forum_access_mod($fid, $gid, $access)
{
    global $grouplist, $forumlist, $uid;
    
    // 结果缓存，加速判断！
    static $result = array();
    $k = $fid . '-' . $gid . '-' . $access;
    if (isset($result[$k])) return $result[$k];

    if (1 == $gid || 2 == $gid) return TRUE; // 管理员有所有权限
    if (3 == $gid || 4 == $gid) {
        $group = $grouplist[$gid];
        $forum = $forumlist[$fid];
        $r = !empty($group[$access]) && in_string($uid, $forum['moduids']);
    } else {
        $r = FALSE;
    }
    $result[$k] = $r;
    
    return $r;
}

function forum_is_mod($fid, $gid, $uid)
{
    global $grouplist, $forumlist;
    

    if (1 == $gid || 2 == $gid) return TRUE; // 管理员有所有权限
    if (3 == $gid || 4 == $gid) {
        if (0 == $fid) return TRUE; // 此处不严谨！
        $group = $grouplist[$gid];
        $forum = $forumlist[$fid];
        return in_string($uid, $forum['moduids']);
    }
    
    return FALSE;
}

// ------------> 其他方法

function forum_access_format(&$access)
{
    
    if (empty($access)) return;
    
}

function forum_access_count($cond = array())
{
    
    $n = db_count('forum_access', $cond);
    
    return $n;
}




?>  !empty($attach) and attach_big_insert($attach);

    

    $attachlist = $imagelist = $filelist = '';
    $images = 0;
    $files = 0;
    // 处理不在 message 中的图片，删除掉没有插入的附件
    if ($message) {
        // 只有评论会传pid
        list($attachlist, $imagelist, $filelist) = $pid ? well_attach_find_by_pid($pid) : well_attach_find_by_tid($tid);

        

        if (!empty($imagelist)) {
            $aids = array();
            foreach ($imagelist as $key => $attach) {

                $image_url = $conf['upload_url'] . 'website_attach/' . $attach['filename'];

                

                if (FALSE === strpos($message, $image_url)) {

                    unset($attachlist[$attach['aid']], $imagelist[$attach['aid']]);

                    $aids[] = $attach['aid'];

                    $path = $conf['upload_path'] . 'website_attach/' . $attach['filename'];
                    is_file($path) and unlink($path);

                    

                    // 删除云储存文件
                }

                
            }

            !empty($aids) and well_attach__delete($aids);

            
        }

        $images = count($imagelist);
        $files = count($filelist);

        
    }

    

    $return += array('tid' => $tid, 'pid' => $pid, 'icon' => $icon, 'message' => $message, 'images' => $images, 'files' => $files);

    

    return $return;
}

// 关联内容中的文件，逐渐放弃使用该函数，使用 well_attach_assoc_handle()
function well_attach_assoc_file($arr = array())
{
    global $conf, $time;

    

    $uid = array_value($arr, 'uid', 0);
    $tid = array_value($arr, 'tid', 0);
    $post_create = array_value($arr, 'post_create', 0); // 创建回复
    $pid = array_value($arr, 'pid', 0);
    $images = array_value($arr, 'images', 0);
    $files = array_value($arr, 'files', 0);
    $message = array_value($arr, 'message');

    if (!$tid && !$pid) return $message;

    

    $attach_dir_save_rule = array_value($conf, 'attach_dir_save_rule', 'Ym');
    $day = date($attach_dir_save_rule, $time);
    $path = $conf['upload_path'] . 'website_attach/' . $day;
    $url = $conf['upload_url'] . 'website_attach/' . $day;
    is_dir($path) || mkdir($path, 0777, TRUE);

    if (!empty($arr['sess_tmp_files'])) {

        $message = urldecode($message);
        preg_match_all('#<img[^>]+src="(.*?)"#i', $message, $match);

        $localurlarr = array(
            'http://' . $_SERVER['SERVER_NAME'] . '/',
            'https://' . $_SERVER['SERVER_NAME'] . '/',
        );

        // 跳过云储存
        $conf['cloud_url'] and $localurlarr[] = $conf['cloud_url'];

        

        /*$match[1]
            Array
            (
                [0] => https://nimg.ws.126.net/?url=http://dingyue.ws.126.net/2021/1109/d3321a58j00r29xq20013c000hk00h4g.jpg&thumbnail=650x2147483647&quality=80&type=jpg
                [1] => https://nimg.ws.126.net/?url=http://dingyue.ws.126.net/2021/1109/e4974b87j00r29xq30013c000fi00i3g.jpg&thumbnail=650x2147483647&quality=80&type=jpg
                [2] => upload/tmp/1_KAUXKFMJHFTUMNS.jpg
                [3] => https://nimg.ws.126.net/?url=http://dingyue.ws.126.net/2021/1109/5a7be552j00r29xq3001qc000hs00hvg.jpg&thumbnail=650x2147483647&quality=80&type=jpg
            )*/
        $upload_arr = array();
        $http_arr = array();
        if (!empty($match[1])) {
            foreach ($match[1] as $_url) {

                foreach ($localurlarr as $localurl) {
                    if ($localurl == substr($_url, 0, strlen($localurl))) continue 2;
                }

                if (substr($_url, 0, 7) == 'http://' || substr($_url, 0, 8) == 'https://') {
                    $http_arr[] = $_url;
                } elseif (substr($_url, 0, 11) == 'upload/tmp/' || substr($_url, 0, 12) == '/upload/tmp/' || substr($_url, 0, 14) == '../upload/tmp/') {
                    $upload_arr[] = $_url;
                }
            }
        }

        

        $attach = array();
        foreach ($arr['sess_tmp_files'] as $file) {

            // 过滤非内容图，不包括附件
            if (!in_array($file['url'], $upload_arr) && 0 != $file['isimage']) {
                unlink($file['path']);
                continue;
            }

            

            // 后台提交的内容需要替换掉../
            $file['url'] = $file['backstage'] ? str_replace('../upload/', 'upload/', $file['url']) : str_replace('/upload/', 'upload/', $file['url']);

            

            // 内容附件 将文件移动到 upload/website_attach 目录
            $filename = file_name($file['url']);

            

            // 绝对路径
            $destfile = $path . '/' . $filename;
            // 相对路径
            $desturl = $url . '/' . $filename;
            // 复制
            xn_copy($file['path'], $destfile) || xn_log("xn_copy($file[path]), $destfile) failed, tid:$tid, pid:$pid", 'php_error');

            

            if (is_file($destfile) && filesize($destfile) == filesize($file['path'])) unlink($file['path']);

            // 按照$destfile文件路径，上传至云储存或图床，返回数据.附件分离，最优方案是redis队列，单独写上传云储存php文件，nohup后台运行，将队列数据上传云储存，然后根据aid更新附件表attach_on、image_url自动，根据tid更新主题表attach_on。关联附件上传云储存，有可能导致超时。

            

            $attacharr = array(
                /*'tid' => $tid,
                'pid' => $pid,*/
                'uid' => $uid,
                'filesize' => $file['filesize'],
                'width' => $file['width'],
                'height' => $file['height'],
                'filename' => $day . '/' . $filename,
                'orgfilename' => $file['orgfilename'],
                //'image_url' => '', // 图床文件完整网址
                'filetype' => $file['filetype'],
                'create_date' => $time,
                'isimage' => $file['isimage']
            );

            $tid and $attacharr += $pid ? array('pid' => $pid) : array('tid' => $tid);

            

            $attach[] = $attacharr;

            // 关联内容再入库
            //$aid = well_attach_create($attach);

            $file['backstage'] and $message = str_replace('../upload/', 'upload/', $message);
            $message = str_replace($file['url'], $desturl, $message);

            
        }

        !empty($attach) and attach_big_insert($attach);

        

        // 清空 session
        $_SESSION['tmp_website_files'] = array();
    }

    

    // 更新附件数
    $update = array();
    $_images = 0;
    $_files = 0;
    // 处理不在 message 中的图片，删除掉没有插入的图片附件
    if ($message) {

        // 只有评论会传pid
        list($attachlist, $imagelist, $filelist) = $pid ? well_attach_find_by_pid($pid) : well_attach_find_by_tid($tid);

        

        if (!empty($imagelist)) {
            $aids = array();
            foreach ($imagelist as $key => $attach) {

                $url = $conf['upload_url'] . 'website_attach/' . $attach['filename'];

                

                if (FALSE === strpos($message, $url)) {
                    unset($attachlist[$attach['aid']], $imagelist[$attach['aid']]);

                    $aids[] = $attach['aid'];

                    $path = $conf['upload_path'] . 'website_attach/' . $attach['filename'];
                    is_file($path) and unlink($path);

                    

                    // 删除云储存文件
                }

                
            }

            !empty($aids) and well_attach__delete($aids);

            
        }

        $_images = count($imagelist);
        $images != $_images and $update['images'] = $_images;

        $_files = count($filelist);
        $files != $_files and $update['files'] = $_files;

        
    }

    

    if (empty($update)) return $pid ? array($message, $_images, $_files) : $message;

    if ($pid) {
        if ($post_create) {
            $update['message'] = $message;
            comment__update($pid, $update);
        } else {
            // 编辑回复返回的数据
            return array($message, $_images, $_files);
        }
    } else {
        well_thread_update($tid, $update);
    }

    

    return $message;
}

// thumbnail:主题主图 post:内容图片或附件
function well_attach_assoc_type($type)
{
    
    switch ($type) {
        case 'thumbnail':
            $k = 'tmp_thumbnail';
            break;
        case 'post':
            $k = 'tmp_website_files';
            break;
        
        default:
            return NULL;
            break;
    }
    $sess_tmp_files = _SESSION($k);
    // 如果session中没有，从数据库中获取储存的session
    //if (empty($sess_tmp_files) && preg_match('#' . $k . '\|(a\:1\:\{.*\})#', _SESSION('data'), $matches)) $sess_tmp_files = unserialize(str_replace(array('+', '='), array('_', '.'), $matches['1']));
    
    return $sess_tmp_files;
}

// Create thumbnail
function well_attach_create_thumbnail($arr)
{
    global $conf, $time, $forumlist, $config;

    $uid = array_value($arr, 'uid', 0);
    $tid = array_value($arr, 'tid', 0);
    $fid = array_value($arr, 'fid', 0);
    $forum = array_value($forumlist, $fid);

    $picture = $config['picture_size'];
    $picture = isset($forum['thumbnail']) ? $forum['thumbnail'] : $picture['picture_size'];
    $pic_width = $picture['width'];
    $pic_height = $picture['height'];

    $attachlist = well_attach_assoc_type('post');
    if (empty($attachlist)) return;

    $attach_dir_save_rule = array_value($conf, 'attach_dir_save_rule', 'Ym');

    $day = date($attach_dir_save_rule, $time);
    $path = $conf['upload_path'] . 'thumbnail/' . $day;
    is_dir($path) || mkdir($path, 0777, TRUE);

    $tmp_file = $conf['upload_path'] . 'tmp/' . $uid . '_' . $tid . '_' . $time . '.jpeg';

    $i = 0;
    foreach ($attachlist as $val) {
        ++$i;
        if (1 == $val['isimage'] && 1 == $i) {
            'clip' == array_value($conf, 'upload_resize', 'clip') ? well_image_clip_thumb($val['path'], $tmp_file, $pic_width, $pic_height) : well_image_thumb($val['path'], $tmp_file, $pic_width, $pic_height);
            break;
        }
    }
    $destfile = $path . '/' . $uid . '_' . $tid . '_' . $time . '.jpeg';
    xn_copy($tmp_file, $destfile) || xn_log("xn_copy($tmp_file), $destfile) failed, tid:$tid", 'php_error');
}

function well_save_remote_image($arr)
{
    global $conf, $time, $forumlist, $config;

    

    $message = array_value($arr, 'message');
    $tid = array_value($arr, 'tid', 0);
    $fid = array_value($arr, 'fid', 0);
    $uid = array_value($arr, 'uid', 0);
    $thumbnail = array_value($arr, 'thumbnail', 0);
    $save_image = array_value($arr, 'save_image', 0);

    $attach_dir_save_rule = array_value($conf, 'attach_dir_save_rule', 'Ym');

    $day = date($attach_dir_save_rule, $time);
    $attach_dir = $conf['upload_path'] . 'website_attach/' . $day . '/';
    $attach_url = $conf['upload_url'] . 'website_attach/' . $day . '/';
    is_dir($attach_dir) || mkdir($attach_dir, 0777, TRUE);

    

    if ($thumbnail) {

        $picture = $config['picture_size'];
        $forum = array_value($forumlist, $fid);
        $picture = isset($forum['thumbnail']) ? $forum['thumbnail'] : $picture['picture_size'];
        $pic_width = $picture['width'];
        $pic_height = $picture['height'];

        $thumbnail_path = $conf['upload_path'] . 'thumbnail/' . $day . '/';
        is_dir($thumbnail_path) || mkdir($thumbnail_path, 0777, TRUE);

        $tmp_file = $thumbnail_path . $uid . '_' . $tid . '_' . $time . '.jpeg';
    }

    $localurlarr = array(
        'http://' . $_SERVER['SERVER_NAME'] . '/',
        'https://' . $_SERVER['SERVER_NAME'] . '/',
    );
    // 跳过云储存
    $conf['cloud_url'] and $localurlarr[] = $conf['cloud_url'];

    

    //$save_image_quality = array_value($conf, 'save_image_quality', 0);
    $save_image_quality = 0;

    $message = urldecode($message);
    //$message = str_replace('&amp;', '&', $message);
    //$message = htmlspecialchars_decode($message);
    preg_match_all('#<img[^>]+src="(http.*?)"#i', $message, $match);

    

    if (!empty($match[1])) {
        $n = 0;
        $i = 0;
        foreach ($match[1] as $url) {

            foreach ($localurlarr as $localurl) {
                if ($localurl == substr($url, 0, strlen($localurl))) continue 2;
            }

            $full_url = htmlspecialchars_decode($url);
            $message = str_replace($url, $full_url, $message);
            $getimgsize = getimagesize($full_url);
            if (FALSE === $getimgsize) continue; // 非图片跳出

            $filename = $uid . '_' . xn_rand(16);
            if (1 == $getimgsize[2]) {
                $filename .= '.gif';
                $destpath = $attach_dir . $filename;
            } elseif (in_array($getimgsize[2], array(2, 3, 15, 18))) {
                $filename .= '.jpeg';
                $destpath = $attach_dir . $filename;
            } else {
                continue; // 非常见图片格式跳出
            }

            $desturl = $attach_url . $filename;
            $_message = str_replace($full_url, $desturl, $message);

            if ($message != $_message) {

                if ($save_image) {
                    if (0 == $save_image_quality) {
                        $imgdata = https_request($full_url);
                        //$destpath = $attach_dir . $filename;
                        file_put_contents_try($destpath, $imgdata);
                    } else {
                        // 图片压缩 GD 库效率低下 ImageMagick 需要额外安装扩展
                        switch ($getimgsize[2]) {
                            case 1: // GIF
                                $imgdata = imagecreatefromgif($full_url);
                                break;
                            case 2: // JPG
                                $imgdata = imagecreatefromjpeg($full_url);
                                break;
                            case 3: // PNG
                                $imgdata = imagecreatefrompng($full_url);
                                break;
                            case 15: // WBMP
                                $imgdata = imagecreatefromwbmp($full_url);
                                break;
                            case 18: // WEBP
                                $imgdata = imagecreatefromwebp($full_url);
                                break;
                        }
                        imagejpeg($imgdata, $destpath, $save_image_quality);
                        imagedestroy($imgdata);
                    }
                }

                // 创建缩略图
                if ($thumbnail) {

                    if (1 == ++$i) {

                        if (empty($save_image)) {
                            $imgdata = https_request($full_url);
                            file_put_contents_try($destpath, $imgdata);
                        }

                        // 裁切保存到缩略图目录
                        'clip' == array_value($conf, 'upload_resize', 'clip') ? well_image_clip_thumb($destpath, $tmp_file, $pic_width, $pic_height, $getimgsize) : well_image_thumb($destpath, $tmp_file, $pic_width, $pic_height, $getimgsize);
                        well_thread_update($tid, array('icon' => $time));
                    }

                    if (empty($save_image)) {
                        is_file($destpath) and unlink($destpath);
                        continue;
                    }
                }

                $filesize = strlen($imgdata);
                $attach = array('tid' => $tid, 'uid' => $uid, 'filesize' => $filesize, 'width' => $getimgsize[0], 'height' => $getimgsize[1], 'filename' => "$day/$filename", 'orgfilename' => $filename, 'filetype' => 'image', 'create_date' => $time, 'downloads' => 0, 'isimage' => 1);
                $aid = well_attach_create($attach);
                $n++;
            }

            $message = preg_replace('#(<img.*?)(class=.+?[\'|\"])|(data-src=.+?[\'|"])|(data-type=.+?[\'|"])|(data-ratio=.+?[\'|"])|(data-s=.+?[\'|"])|(data-fail=.+?[\'|"])|(crossorigin=.+?[\'|"])|((data-w)=[\'"]+[0-9]+[\'"]+)|(_width=.+?[\'|"]+)|(_height=.+?[\'|"]+)|(style=.+?[\'|"])|((width)=[\'"]+[0-9]+[\'"]+)|((height)=[\'"]+[0-9]+[\'"]+)#i', '$1', $_message);
        }
        
        $n and well_thread_update($tid, array('images+' => $n));
    }

    
    return $message;
}

function well_get_image_url($url)
{
    if ($n = strpos($url, '.jpg')) {
        $_n = $n + 4;
    } elseif ($n = strpos($url, '.jpeg')) {
        $_n = $n + 5;
    } elseif ($n = strpos($url, '.png')) {
        $_n = $n + 4;
    } elseif ($n = strpos($url, '.gif')) {
        $_n = $n + 4;
    } elseif ($n = strpos($url, '.bmp')) {
        $_n = $n + 4;
    }

    $url = $n ? mb_substr($url, 0, $_n, 'UTF-8') : NULL;

    return $url;
}




?>     // 频道和全局置顶主题
        foreach ($arrlist as $val) {
            if (in_array($val['fid'], $fids) && 2 == $val['sticky']) {
                $sticky2[$val['tid']] = $val;
            } elseif (3 == $val['sticky']) {
                $sticky3[$val['tid']] = $val;
            }
        }
    } else {
        // 栏目/上级频道/全局置顶
        foreach ($arrlist as $val) {
            if ($forum['fid'] == $val['fid'] && 1 == $val['sticky']) {
                $sticky1[$val['tid']] = $val;
            } elseif (in_array($val['fid'], $fids) && 2 == $val['sticky']) {
                $sticky2[$val['tid']] = $val;
            } elseif (3 == $val['sticky']) {
                $sticky3[$val['tid']] = $val;
            }
        }
    }

    $sticky3 = empty($sticky3) ? array() : array_multisort_key($sticky3, 'create_date', FALSE, 'tid');
    $sticky2 = empty($sticky2) ? array() : array_multisort_key($sticky2, 'create_date', FALSE, 'tid');
    $sticky1 = empty($sticky1) ? array() : array_multisort_key($sticky1, 'create_date', FALSE, 'tid');

    $arr = $sticky3 + $sticky2 + $sticky1;

    

    return $arr;
}

// 全部置顶缓存
function sticky_thread_find_cache()
{
    global $conf;

    

    $key = 'sticky_thread_list';
    static $cache = array(); // 用静态变量只能在当前 request 生命周期缓存，跨进程需要再加一层缓存：redis/memcached/xcache/apc
    if (isset($cache[$key])) return $cache[$key];

    

    if ('mysql' == $conf['cache']['type']) {
        $arr = sticky_thread__find(array(), array('tid' => -1), 1, 2000);
    } else {
        $arr = cache_get($key);
        if (NULL === $arr) {
            $arr = sticky_thread__find(array(), array('tid' => -1), 1, 2000);
            $arr AND cache_set($key, $arr, 1800);
        }
    }

    

    $cache[$key] = $arr ? $arr : NULL;

    

    return $cache[$key];
}




?><!DOCTYPE html><html lang="zh-cn"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><meta http-equiv="X-UA-Compatible" content="IE=Edge,chrome=1" /><meta http-equiv="Cache-Control" content="no-transform" /><meta http-equiv="Cache-Control" content="no-siteapp" /><meta name="viewport"
          content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no"><meta name="referrer" content="origin-when-cross-origin"><meta name="applicable-device" content="pc,mobile" /><meta name="MobileOptimized" content="width" /><meta name="HandheldFriendly" content="true" /><meta name="renderer" content="webkit" /><meta name="keywords" content="电力线,信号,技术,传输,实现,设备,信息" /><meta name="description" content="电力线通信技术及其应用" /><title>电力线通信技术及其应用编程频道|福州电脑网
</title><link rel="shortcut icon" href="/view/img/favicon.ico" /><link rel="icon" sizes="32x32" href="/view/img/favicon.ico"><link rel="Bookmark" href="/view/img/favicon.ico" /><link rel="stylesheet" href="/view/template/mitiqin/css/style.css?2.3.0"><link rel="stylesheet" href="/view/template/mitiqin/css/iconfont.css?2.3.0"><script src="/view/template/mitiqin/js/jquery-2.2.4.min.js?2.3.0" type="text/javascript"></script></head><body><div id="header"><div class="header container"><div class="logo"><a href="/"  title="福州电脑网_福州电脑维修_福州电脑之家_福州iThome"><img src="/view/template/mitiqin/img/logo.png" alt="福州电脑网_福州电脑维修_福州电脑之家_福州iThome"></a></div><div id="monavber" class="nav" data-type="index" data-infoid><ul id="nav" class="navbar"><li class="navbar-item" data-active="fid-0"><a href="/">首页</a></li><li class="navbar-item" fid="5" data-active="fid-5"><a href="/biancheng">编程之家</a></li><li class="navbar-item" fid="4" data-active="fid-4"><a href="/xitong">系统教程</a></li><li class="navbar-item" fid="12" data-active="fid-12"><a href="/shuma">数码周边</a></li><li class="navbar-item" fid="13" data-active="fid-13"><a href="/pc">电脑</a></li></ul></div><div id="mnav"><i class="iconfont icon-app"></i></div><div id="search"><i class="iconfont icon-search"></i></div><div class="search"><form id="form-search" action="/operate/search.html"><input type="text" name="keyword" placeholder="关键词" value=""/><button type="submit" value="搜索"><i class="iconfont icon-search"></i></button><input type="hidden" name="range" value="1"></form></div></div></div>
<div class="fzithome-com breadcrumb2 container-w"><div id="b" class="cl"><div class="fzithome-com fl"><i class="iconfont icon-home"></i><a href="/">首页</a>&nbsp;>&nbsp;
<a href="/xitong">系统教程</a><a href="/xitong/1706145832a229860.html" title="首页">电力线通信技术及其应用</a></div></div></div><div class="fzithome-com main container-w cl"><div class="fzithome-com mainl"><div class="fzithome-com art-post"><div class="fzithome-com title"><h1>电力线通信技术及其应用</h1><div class="fzithome-com info"><span><a href="/xitong"><i class="iconfont icon-crossborder-fill"></i>系统教程</a></span><span><i class="iconfont icon-browse"></i>92</span><span><i class="iconfont icon-message-fill"></i>0</span><span>
                        更新时间：2026-04-06 12:48:01</span></div></div><div class="fzithome-com art-content"><article class="single-post"><div class="fzithome-com entry"><p>2024年1月25日发(作者：)</p><p><h2></h2></p><p></img></p><p style="text-indent: 2em;";></p><p style="text-indent: 2em;";>龙源期刊网  </p><p style="text-indent: 2em;";>电力线通信技术及其应用 </p><p style="text-indent: 2em;";>作者：李洪民 </p><p style="text-indent: 2em;";>来源：《数字技术与应用》2013年第06期 </p><p style="text-indent: 2em;";>        摘要： 本文介绍了利用电力线传输数据和媒体信号的通信方式，并就该技术的具体应用作了介绍，该技术是把载有信息的高频加载于电流然后用电线传输接受信息，再把高频从电流中分离出来并传送到终端以实现信息传递 </p><p style="text-indent: 2em;";>        关键词：电力线 通信 电力猫 调制 载波 </p><p style="text-indent: 2em;";>        中图分类号：TN91 文献标识码：A 文章编号：1007-9416（2013）06-0042-02 </p><p style="text-indent: 2em;";>        电力线通信（Power Line Communication，英文简称PLC）技术是利用电力线传输数据和媒体信号的一种通信方式，该技术是把载有信息的高频加载于电流然后用电线传输接受信息再把高频从电流中分离出来并传送到计算机或电话等终端以实现信息传递。该技术最大的优势是不需要重新布线，只是在电力线上实现数据语音和视频等多业务的承载实现四网合一，终端用户只需要插上电源插头就可以实现因特网接入。在中国，三网已经开始进行融合，这对电力线通讯（Power Line Communication--PLC）需求也就越来越强烈。电力猫的出现，则是PLC技术的最新发展。电力猫即“电力线通讯调制解调器”，是通过电力线进行宽带上网设备的俗称。使用家庭或办公室现有电力线和插座组建成网络，来连接PC、ADSL modem、机顶盒、音频设备、监控设备以及其它的智能电气设备，来传输数据，语音和视频。它具有即插即用的特点，能通过普通家庭电力线传输网络IP数字信号。 </p><p style="text-indent: 2em;";>        1 基本原理 </p><p style="text-indent: 2em;";>        在发送数据时，利用调制技术将用户数据进行调制，把载有信息的高频加载于电流，然后在电力线上进行传输；在接收端，先经过滤波器将调制信号取出，再经过解调，就可得到原通信信号， 并传送到终端设备，以实现信息传递。PLC设备分局端和调制解调器，局端负责与内部PLC调制解调器的通信和与外部网络的连接。在通信时，来自用户的数据进入调制解调器调制后，通过用户的配电线路传输到局端设备，局端将信号解调出来，再转到外部的Internet。电力线载波双向传输模块包括：调制器、振荡器、功放、T/R转向开关、耦合电路和解调器等部分组成，其中振荡器是为调制器提供一个载波信号。在发射数据时，待发信号从TXD端发出后，经调制器进行调制，然后将已调信号送到功放级进行放大，再经过 T/R转向开关和耦合电路把已调信号加载到电力线上。接收数据时，发射模块发送出的已调信号通过耦合电路和T/R 转向开关进入解调器，经解调器解调后提取原始信号，并将原始信号从RXD 端送到下一级的数字设备中。 </p><p style="text-indent: 2em;";>        2 现状 </p><p><p><h2></h2></p></img></p></div></article></div><div class="fzithome-com info"><div><span>本文发布于:2024-01-25，感谢您对本站的认可！</span></div><div><span>本文链接:</span><a href="https://www.fzithome.com/xitong/1706145832a229860.html" title="电力线通信技术及其应用">https://www.fzithome.com/xitong/1706145832a229860.html</a></div><div><span>版权声明:本站内容均来自互联网，仅供演示用，请勿用于商业和其他非法用途。如果侵犯了您的权益请与我们联系，我们将在24小时内删除。</span></div></div><span class="tag"><i class="iconfont icon-discount" style="font-size:12px;font-weight:bold;opacity:.7;">本文标签：</i><a href="/tag/6900.html" target="_blank">电力线</a><a href="/tag/340.html" target="_blank">信号</a><a href="/tag/896.html" target="_blank">技术</a><a href="/tag/1333.html" target="_blank">传输</a><a href="/tag/1102.html" target="_blank">实现</a></span></div><div class="fzithome-com post_comments" id="comments"><div id="comt-respond" class="commentpost"><h4>发布评论
<span><a rel="nofollow" id="cancel-reply" href="#comment" style="display:none;"><small>取消回复</small></a></span></h4><form action="/comment/create/229860.html?safe_token=ThZ6wZGn6A1ClPcUbtPEIfMTqLFfqugb_2BD3xGVMKbuBzaacPkcAa8M_2FoKT3zc0tjMguQt2g_2Fni9DEjCieIRBOw_3D_3D" method="post" name="saypl" id="frmSumbit"><input type="hidden" name="doctype" value="1" /><input type="hidden" name="quotepid" value="0" /><div id="comment-tools"><div class="fzithome-com tools_text"><textarea placeholder="请在这里留言..." name="message" id="txaArticle" class="text input-block-level comt-area" cols="50" rows="4" tabindex="5"></textarea></div></div><div class="fzithome-com psumbit"><input name="sumbit" type="submit" tabindex="6" value="发布" class="button" /></div></form></div><div class="fzithome-com commentlist"><div class="fzithome-com comment-tab"><div class="fzithome-com come-comt">评论列表<span id="comment_count">（有<span id="infocommentnumarea" style="color:#c81111">0</span>条评论）</span></div></div><ul class="diy-comment"></ul></div></div></div><div class="fzithome-com mainr"><div class="widget widget_previous"><h4 class="bar">最近发表</h4><ul><li><a href="/xitong/1700737021a9.html"title='教你徒手建立mdb文件' aria-label='教你徒手建立mdb文件'>教你徒手建立mdb文件</a></li><li><a href="/xitong/1700737038a10.html"title='各类文件怎么打开及文件类型详解' aria-label='各类文件怎么打开及文件类型详解'>各类文件怎么打开及文件类型详解</a></li><li><a href="/xitong/1700737932a52.html"title='access,recordsetclone子窗体新增记录' aria-label='access,recordsetclone子窗体新增记录'>access,recordsetclone子窗体新增记录</a></li><li><a href="/xitong/1700738093a61.html"title='Access模拟练习一(创建和使用数据表)' aria-label='Access模拟练习一(创建和使用数据表)'>Access模拟练习一(创建和使用数据表)</a></li><li><a href="/xitong/1700740726a176.html"title='如何根据GPS坐标生成面状图及面积计算' aria-label='如何根据GPS坐标生成面状图及面积计算'>如何根据GPS坐标生成面状图及面积计算</a></li><li><a href="/xitong/1700740999a190.html"title='如何在CaptureCIS配置本地元器件数据库' aria-label='如何在CaptureCIS配置本地元器件数据库'>如何在CaptureCIS配置本地元器件数据库</a></li><li><a href="/xitong/1700742603a259.html"title='高中信息技术学考ACCESS操作题练习' aria-label='高中信息技术学考ACCESS操作题练习'>高中信息技术学考ACCESS操作题练习</a></li><li><a href="/xitong/1700749038a575.html"title='简述热点的类型特点和收集方法' aria-label='简述热点的类型特点和收集方法'>简述热点的类型特点和收集方法</a></li><li><a href="/xitong/1700749333a590.html"title='蛋白聚糖:与疾病相关的研究新热点' aria-label='蛋白聚糖:与疾病相关的研究新热点'>蛋白聚糖:与疾病相关的研究新热点</a></li><li><a href="/xitong/1700749396a593.html"title='益盟操盘手手机版' aria-label='益盟操盘手手机版'>益盟操盘手手机版</a></li><li><a href="/xitong/1700751853a711.html"title='新媒体时代下广播电视台新闻编辑能力创新' aria-label='新媒体时代下广播电视台新闻编辑能力创新'>新媒体时代下广播电视台新闻编辑能力创新</a></li><li><a href="/xitong/1700759630a1085.html"title='如何设置电脑的系统恢复和备份选项' aria-label='如何设置电脑的系统恢复和备份选项'>如何设置电脑的系统恢复和备份选项</a></li><li><a href="/xitong/1700760144a1112.html"title='Windows XP操作系统自带工具进行备份与还原' aria-label='Windows XP操作系统自带工具进行备份与还原'>Windows XP操作系统自带工具进行备份与还原</a></li><li><a href="/xitong/1700760263a1119.html"title='Lenovo电脑如何进行一键恢复' aria-label='Lenovo电脑如何进行一键恢复'>Lenovo电脑如何进行一键恢复</a></li><li><a href="/xitong/1700761604a1191.html"title='windows7还原C盘的方法步骤' aria-label='windows7还原C盘的方法步骤'>windows7还原C盘的方法步骤</a></li><li><a href="/xitong/1700765488a1408.html"title='电脑变慢了' aria-label='电脑变慢了'>电脑变慢了</a></li><li><a href="/xitong/1700766963a1492.html"title='DIY全自动CPU风扇调速器' aria-label='DIY全自动CPU风扇调速器'>DIY全自动CPU风扇调速器</a></li><li><a href="/xitong/1700767236a1508.html"title='电脑主机风扇声音四大原因及解决办法' aria-label='电脑主机风扇声音四大原因及解决办法'>电脑主机风扇声音四大原因及解决办法</a></li><li><a href="/xitong/1700767750a1536.html"title='散热风扇知识(很全)' aria-label='散热风扇知识(很全)'>散热风扇知识(很全)</a></li><li><a href="/xitong/1700767766a1537.html"title='联想笔记本电脑风扇不转的原因以及解决方法' aria-label='联想笔记本电脑风扇不转的原因以及解决方法'>联想笔记本电脑风扇不转的原因以及解决方法</a></li></ul></div><section id="aside_about" class="widget widget_aside_about sb br mb"><div class="avatar"><img class="img" src="/view/template/mitiqin/img/tx.jpg"
             alt="福州电脑网_福州电脑维修_福州电脑之家_福州iThome"/></div><div class="wrap pd"><p class="title">福州电脑网_福州电脑维修_福州电脑之家_福州iThome</p><p class="info">福州电脑维修网(fzithome.com)专业的电脑维修,笔记本维修,上门维修各种电脑,笔记本,平板等,快速上门.电脑知识频道内容覆盖:计算机资讯,电脑基础应用知识,各种电脑故障维修学习,电脑外设产品维修维护,病毒，软件,硬件,常识.</p><ul class="ul clearfix"></ul></div></section><div class="fzithome-com clear"></div><div class="fzithome-com widgets"><h4 class="bar">相关推荐</h4><div class="fzithome-com hot-post"><ul class="clearfix"><li><a href="/biancheng/1755037725a2662615.html"title='Web版Photoshop来了，用到了哪些前端技术？' aria-label='Web版Photoshop来了，用到了哪些前端技术？'><span class="sptit">Web版Photoshop来了，用到了哪些前端技术？</span></a></li><li><a href="/xitong/1767247710a2675317.html"title='电脑定时开关机技巧与解决方案' aria-label='电脑定时开关机技巧与解决方案'><span class="sptit">电脑定时开关机技巧与解决方案</span></a></li><li><a href="/xitong/1767269824a2675443.html"title='破解 openai 访问权限的详细步骤与注意事项' aria-label='破解 openai 访问权限的详细步骤与注意事项'><span class="sptit">破解 openai 访问权限的详细步骤与注意事项</span></a></li><li><a href="/xitong/1767399728a2676183.html"title='自动登录教程：关键词优化与搜索引擎优化技巧' aria-label='自动登录教程：关键词优化与搜索引擎优化技巧'><span class="sptit">自动登录教程：关键词优化与搜索引擎优化技巧</span></a></li><li><a href="/xitong/1767430216a2676356.html"title='手机照片传到电脑的多种方法详解' aria-label='手机照片传到电脑的多种方法详解'><span class="sptit">手机照片传到电脑的多种方法详解</span></a></li><li><a href="/xitong/1767445340a2676443.html"title='OpenAIQQ登录查询系统指南与技术详解' aria-label='OpenAIQQ登录查询系统指南与技术详解'><span class="sptit">OpenAIQQ登录查询系统指南与技术详解</span></a></li><li><a href="/xitong/1767483161a2676666.html"title='无线网络受限制或无连接如何解决' aria-label='无线网络受限制或无连接如何解决'><span class="sptit">无线网络受限制或无连接如何解决</span></a></li><li><a href="/xitong/1767512739a2676849.html"title='OpenAI DLL文件详解：作用、定位与典型用途' aria-label='OpenAI DLL文件详解：作用、定位与典型用途'><span class="sptit">OpenAI DLL文件详解：作用、定位与典型用途</span></a></li><li><a href="/xitong/1770685088a2679057.html"title='从菜鸟到高手，你的第一步：光纤宽带与路由器快速连接攻略' aria-label='从菜鸟到高手，你的第一步：光纤宽带与路由器快速连接攻略'><span class="sptit">从菜鸟到高手，你的第一步：光纤宽带与路由器快速连接攻略</span></a></li><li><a href="/biancheng/1770734786a2679606.html"title='优酷大揭秘：掌握SWF与Flash技术，让视频播放更流畅' aria-label='优酷大揭秘：掌握SWF与Flash技术，让视频播放更流畅'><span class="sptit">优酷大揭秘：掌握SWF与Flash技术，让视频播放更流畅</span></a></li><li><a href="/biancheng/1771251140a2684129.html"title='告别单点限制，用无线桥接＋交换机构建全面覆盖网络！' aria-label='告别单点限制，用无线桥接＋交换机构建全面覆盖网络！'><span class="sptit">告别单点限制，用无线桥接＋交换机构建全面覆盖网络！</span></a></li><li><a href="/xitong/1771252286a2684144.html"title='SWF与无线桥接，解锁更多网络功能和速度' aria-label='SWF与无线桥接，解锁更多网络功能和速度'><span class="sptit">SWF与无线桥接，解锁更多网络功能和速度</span></a></li><li><a href="/biancheng/1771375899a2685553.html"title='实战操作：快速掌握Cisco7606 E1线路配置方法' aria-label='实战操作：快速掌握Cisco7606 E1线路配置方法'><span class="sptit">实战操作：快速掌握Cisco7606 E1线路配置方法</span></a></li><li><a href="/biancheng/1771452210a2686427.html"title='一步步详解家网设备如何串起数字生活' aria-label='一步步详解家网设备如何串起数字生活'><span class="sptit">一步步详解家网设备如何串起数字生活</span></a></li><li><a href="/xitong/1771452522a2686431.html"title='&#039;光猫上网经历了啥&#039;? 详解家庭网络的基础设施与进阶指南' aria-label='&#039;光猫上网经历了啥&#039;? 详解家庭网络的基础设施与进阶指南'><span class="sptit">&#039;光猫上网经历了啥&#039;? 详解家庭网络的基础设施与进阶指南</span></a></li><li><a href="/biancheng/1771516378a2687148.html"title='警惕！无线网络加密的误区与正确做法，保护你的数据不泄露' aria-label='警惕！无线网络加密的误区与正确做法，保护你的数据不泄露'><span class="sptit">警惕！无线网络加密的误区与正确做法，保护你的数据不泄露</span></a></li><li><a href="/biancheng/1771548538a2687515.html"title='AHCI 电力管控：深入理解 AHCI 链路的电力分配' aria-label='AHCI 电力管控：深入理解 AHCI 链路的电力分配'><span class="sptit">AHCI 电力管控：深入理解 AHCI 链路的电力分配</span></a></li><li><a href="/biancheng/1771549929a2687533.html"title='全面解读 AHCI 连接下的电源管理技巧与策略' aria-label='全面解读 AHCI 连接下的电源管理技巧与策略'><span class="sptit">全面解读 AHCI 连接下的电源管理技巧与策略</span></a></li><li><a href="/xitong/1773226030a2699207.html"title='开机BIOS 自检，遇到问题怎么办？实用技巧大揭秘！' aria-label='开机BIOS 自检，遇到问题怎么办？实用技巧大揭秘！'><span class="sptit">开机BIOS 自检，遇到问题怎么办？实用技巧大揭秘！</span></a></li><li><a href="/xitong/1775299286a2711747.html"title='深度清理技术，专为SWF、Flash中心与Adobe Flash Player用户设计的垃圾文件消除术！' aria-label='深度清理技术，专为SWF、Flash中心与Adobe Flash Player用户设计的垃圾文件消除术！'><span class="sptit">深度清理技术，专为SWF、Flash中心与Adobe Flash Player用户设计的垃圾文件消除术！</span></a></li></ul></div></div><div class="fzithome-com clear"></div><div class="widget widget_tags"><h4 class="bar">标签列表</h4><ul><li class="submenu"><a target="_blank" href="/tag/245232.html">开机瞬间</a></li><li class="submenu"><a target="_blank" href="/tag/245230.html">关机后启</a></li><li class="submenu"><a target="_blank" href="/tag/245220.html">务大更新</a></li><li class="submenu"><a target="_blank" href="/tag/245204.html">辅助端口</a></li><li class="submenu"><a target="_blank" href="/tag/245147.html">轻松结束</a></li><li class="submenu"><a target="_blank" href="/tag/245132.html">在注册账</a></li><li class="submenu"><a target="_blank" href="/tag/245115.html">联想天逸</a></li><li class="submenu"><a target="_blank" href="/tag/245037.html">高危端口</a></li><li class="submenu"><a target="_blank" href="/tag/245003.html">地址位置</a></li><li class="submenu"><a target="_blank" href="/tag/245002.html">地址的位</a></li><li class="submenu"><a target="_blank" href="/tag/244971.html">走出困境</a></li><li class="submenu"><a target="_blank" href="/tag/244920.html">位客户端</a></li><li class="submenu"><a target="_blank" href="/tag/244917.html">中的一些</a></li><li class="submenu"><a target="_blank" href="/tag/244892.html">的外接程</a></li><li class="submenu"><a target="_blank" href="/tag/244863.html">不再难</a></li><li class="submenu"><a target="_blank" href="/tag/244835.html">拼音用户</a></li><li class="submenu"><a target="_blank" href="/tag/244822.html">单击框内</a></li><li class="submenu"><a target="_blank" href="/tag/244818.html">掉的电脑</a></li><li class="submenu"><a target="_blank" href="/tag/244746.html">多进程对</a></li><li class="submenu"><a target="_blank" href="/tag/244744.html">核心上运</a></li></ul></div><div class="fzithome-com clear"></div></div></div><footer id="footer"><div class="footer container-w cl"><div class="fnav"></div><span class="copy">

            CopyRight © 2022 All Rights Reserved

            <a href="/" title="福州电脑网_福州电脑维修_福州电脑之家_福州iThome" target="_blank">福州电脑网_福州电脑维修_福州电脑之家_福州iThome</a></span>
        备案号：<a target="_blank" rel="nofollow" href="https://beian.miit.gov.cn/" style="font-size: 12px;">豫ICP备2022026798号-13</a></div></footer><script src="/view/template/mitiqin/js/common.min.js?2.3.0"></script><script src="/view/js/xiuno.js"></script><script src="/view/template/mitiqin/js/app.js?2.3.0"></script><div id="gotop"><div style="display: none; margin-bottom:5px;" id="goTopBtn"><a title="返回顶部" class="gotopa"><span class="iconfont icon-rocket-fill"></span></a></div></div></body></html>