Table of ContentsTable of ContentsChapter 1. IntroductionT1/FT1 Overview ............................................................................................... 1T1 Service Offerings .................................................................................... 1Fractional T1 ................................................................................................. 2TSU 600 Overview .............................................................................................. 3Functional Description ............................................................................... 3TSU .................................................................................................. 3TSU 100 ........................................................................................... 3TSU 600 ........................................................................................... 3Identification of Rear Panel Layout .......................................................... 5Features of the TSU 600 .............................................................................. 6TSU Interfaces .............................................................................................. 7Network Interface ........................................................................................ 7Control Port Input ....................................................................................... 8Chain Port Output ....................................................................................... 8Three Methods of Control ................................................................................. 9Front Panel ................................................................................................... 9ADTRAN PC Program ............................................................................... 9SNMP ............................................................................................................ 9Option Slot Arrangement ................................................................................ 10Slot 1 ............................................................................................................ 10Slot 2 ............................................................................................................ 10Slots 3-5 ....................................................................................................... 10Slot 6 ............................................................................................................ 11Option Ports ...................................................................................................... 12Secondary Interfaces (SI) .......................................................................... 12Other Data Interfaces ................................................................................ 12TSU 600 Clock Sources ............................................................................. 13Network Timed .......................................................................................... 13DTE Timed ................................................................................................. 14Internal Timing .......................................................................................... 15Normal (CSU) Timing ............................................................................... 16TSU 600 Testing ................................................................................................. 17Self Tests ..................................................................................................... 1761200.076L2-1 TSU 600 User Manual i