Abstract: Application Note 387 describes the use of the Dallas Semiconductor/Maxim DS2148/DS21348 as a T1 or E1 repeater. A simple circuit diagram shows typical connections. Configurations for Hardware Mode and Software Mode are also provided. Introduction This application note describes the register settings for Dallas Semiconductor's DS2148 and DS21348 (E1/T1/J1 line interface units) as a repeater for T1 or E1 operation. This can be accomplished with the device in either hardware or software mode. The receive sensitivity for these two LIUs is programmable and is as much as -36dB for T1 applications and -43dB for E1 applications. To simplify the design, it is recommended to use a 2.048MHz oscillator and use the internal register settings of the DS2148 and the DS21348 to convert the MCLK to 1.544MHz for T1 applications. Figure 1. Typical T1/E1 repeater application. The configuration settings of the DS2148 or the DS21348 in hardware mode are: HARDWARE MODE SETTINGS FOR T1 HARDWARE MODE SETTINGS FOR E1 MCLK = 2.048MHz MCLK = 2.048MHz BIS1 = 1, BIS0 = 1 BIS1 = 1, BIS0 = 1 CES = 0 CES = 0 DJA = 0 or 1 (application dependent) DJA = 0 or 1 (application dependent) HBE = 1 HBE = 1 JAS = 0 or 1 (application dependent) JAS = 0 or 1 (application dependent) NRZE = 0 NRZE = 0 TPD = 0 TPD = 0 L2 = L1 = L0 = 0 L2/L1/L0 (application dependent) TX1 = 0, TX0 = 0 TX1 = 0, TX0 = 0 LOOP1 = 0, LOOP0 = 0 LOOP1 = 0, LOOP0 = 0 EGL = 1, ETS = 1 (limited long haul) EGL = 0, ETS = 1 (long haul) EGL = 0, ETS = 0 (short haul) EGL = 1, ETS = 0 (long haul) MM1 = 0, MM0 = 0 MM1 = 0, MM0 = 0 RT1 = 1, RT0 = 0 (internal Rx side, 100Ω enabled) RT1 = 0, RT0 = 1 (internal Rx side, 120Ω enabled) RT1 = 1, RT0 = 1 (internal Rx side, 75Ω enabled) JAMUX = 1, ETS = 1 JAMUX = 1, ETS = 0 The configuration settings of the DS2148 or the DS21348 in software mode are: SOFTWARE MODE REGISTER SETTINGS FOR T1 SOFTWARE MODE REGISTER SETTINGS FOR E1 MCLK = 2.048MHz MCLK = 2.048MHz CCR1 (00H) CCR1.7 = 1 CCR1.6 = 0 CCR1.3 = 1 CCR1.1 = 1 CCR1 (00H) CCR1.7 = 0 CCR1.6 = 0 CCR1.3 = 1 CCR1.1 = 1 CCR2 (01H) CCR2.3 = 1 CCR2.2 = 1 CCR2.1 = 0 CCR2.0 = 0 CCR2 (01H) CCR2.3 = 1 CCR2.2 = 1 CCR2.1 = 0 CCR2.0 = 0 CCR4 (03H) CCR4.7 = CCR4.6 = CCR4.5 = 0 CCR4.1 (application dependent) CCR4.0 = 0 CCR4 (03H) CCR4.7, CCR4.6, and CCR4.5 (application dependent) CCR4.1 (application dependent) CCR4.0 = 0 CCR5 (04H) CCR5.5 = 0, CCR5.4 = 0 CCR5.1 = 1, CCR5.0 = 0 (internal Rx side, 100Ω enabled) CCR5 (04H) CCR5.5 = 0, CCR5.4 = 0 CCR5.1 = 0, CCR5.0 = 1 (internal RX side, 120Ω enabled) CCR5.1 = 1, CCR5.0 = 1 (internal Rx side, 75Ω enabled) 의견을 보내주세요! 위 내용이 도움이 되셨나요? 여러분의 의견을 기다립니다 — Maxim은 보내주신 정정이나 제안사항을 반영하고 있습니다. 이 페이지를 평가하고 의견을 보내주십시오. 자동 업데이트 관심있는 분야의 애플리케이션 노트가 나올 때 자동으로 업데이트 받고 싶으세요? 그렇다면 EE-Mail™을 신청하십시오. 추가 정보   APP 387: May 29, 2002 DS21348 3.3V E1/T1/J1 라인 인터페이스 전체 데이터 시트 (PDF, 792kB) 무료 샘플 DS2148 5V E1/T1/J1 라인 인터페이스 전체 데이터 시트 (PDF, 1.1MB) 무료 샘플   다운로드, PDF 형식 (28kB)  AN387, AN 387, APP387, Appnote387, Appnote 387