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ISDN ANALYZER D1080 USER’S MANUAL REV. 5 8.3.1. Checking the remote supply voltage from NT1 In TE SIMULATOR or MONITOR mode, the instrument checks the supply voltage level from NT1 and acknowledges reverse polarity in emergency condition. If supply voltage is detected over the S-BUS, the main display page shows the corresponding value expressed in volts with the polarity sign. The reverse characters indicate the emergency condition of the NT1 termination. The instrument classifies the information about the remote supply voltage as low, good or high with the following symbols which appear in the top right corner of the display: 70 “A”, if S-BUS power supply is absent , when the S-BUS voltage is lower than the minimum value provided for by the specifications (24 V in standard condition and 34 V in emergency power condition) , when the S-BUS power supply is compliant with the specification values , when the S-BUS voltage is higher than the maximum value provided for by the specifications (42 V) The symbols are shown in inverse video in case of emergency condition. CHAPTER 8. MONITORING THE PHYSICAL LEVEL
USER’S MANUAL REV. 5 ISDN ANALYZER D1080 In TE TEST mode, no information about the remote supply is given since the instrument gives this value by means of the D1029 external adapter (see Chapter 13). 8.3.2. Checking the activation state of the physical level The “BRA INFO” LED’s indicate the activation state of the physical level (INFO1, INFO2, INFO3 and INFO4). BRA INFO � 2 � 1 When on, LED 1 indicates that the signal has been sent from the Terminal to the Network for a call request (INFO1). When on, LED 2 indicates that the signal has been sent from the Network to the Terminal to confirm the call request (INFO2) or indicate the request for connection from the Network to the Terminal. � 4 � 3 When on, LED 3 indicates the signal synchronization from the Terminal to the Network to accept the connection (INFO3). When on, LED 4 (INFO4) indicates the signal synchronization from the Network to the Terminal and the activation of the physical level (level 1). If LED INFO3 and the D channel LED’s start flashing with LED INFO4 off, the S-BUS termination may be incorrect (see Chapter 7). CHAPTER 8. MONITORING THE PHYSICAL LEVEL 71
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