Abstract: Application Note 338 provides the criteria used to set and clear alarms using the Dallas Semiconductor/Maxim DS2141A T1 Controller and DS2151 Single Chip Transceiver (SCT). Alarm Set Criteria Clear Criteria Blue Alarm (AIS) (see note 1 below) when over a 3ms window, 5 or less zeros are received when over a 3ms window, 6 or more zeros are received Yellow Alarm 1. D4 bit 2 mode (RCR2.2 = 0) when bit 2 of 256 consecutive channels is set to zero for at least 254 occurrences when bit 2 of 256 consecutive channels is set to zero for less than 254 occurrences 2. D4 12th F–bit mode (RCR2.2 = 1; this mode is also referred to as the "Japanese Yellow Alarm") when the 12th framing bit is set to one for two consecutive occurrences when the 12th framing bit is set to zero for two consecutive occurrences 3. ESF mode when 16 consecutive patterns of 00FF hex appear in the FDL when 14 or less patterns of 00FF hex out of 16 possible appear in the FDL Red Alarm (RCL) (this alarm is also referred to as Loss Of Signal) when 192 consecutive zeros are received when at least 12.5% one's density is received Notes: The definition of Blue Alarm (or Alarm Indication Signal) is an unframed all ones signal. Blue alarm detectors should be able to operate properly in the presence of a 10-3 error rate and they should not falsely trigger on a framed all ones signal. The blue alarm criteria in the DS2141A and DS2151 has been set to achieve this performance. 関連製品   APP 338: Aug 10, 2001 DS2141A T1コントローラ フルデータシート (PDF, 480kB) 無料 サンプル 自動アップデート お客様が関心のある分野でアプリケーションノートが新規に掲載された際に自動通知Eメールの受信を希望する場合は、EE-Mail™にご登録ください。 We Want Your Feedback! フィードバックをお寄せください。 内容に満足されましたか、あるいは満足されていませんか？もっと良いページにできると思いますか？あるいは、単なるコメントでも結構です。フィードバックをお待ちしています。—マキシムはお客様からいただく訂正、提案を元に改善していきます。 このページを評価し、フィードバックを送信する。   ダウンロード、PDFフォーマット(23kB)  AN338, AN 338, APP338, Appnote338, Appnote 338