2-22 Hardware DescriptionEnhanced Vanguard DaughtercardsATM Enhanced DaughtercardIntroduction This section describes how to install a T1/E1 ATM Enhanced Daughtercard(Figure 2-28) into a Vanguard 6435 or Vanguard 6455. They support a maximum oftwo ATM EDCs; each connecting a single port to either a T1 or E1 leased linenetwork.Figure 2-28. ATM T1/E1 EDCsATM E1 SwitchSettingsThe E1 version of the ATM Enhanced Daughtercard contains a block of DIPswitches. These are two position slide switches that set connection impedance.• When all switches are in the on position you select 75 Ω impedance.• When all switches are in the off position you select 120 Ω impedance.Figure 2-29. ATM E1 Enhanced Daughtercard Switch SettingsThere are two versions of the ATM Enhanced Daughtercard, one for T1 and theother for E1 applications. Figure 2-30 shows the rear panel of the T1 version andFigure 2-31 shows the rear panel of the E1 version.Figure 2-30. ATM Enhanced Daughtercard Rear Panel: T1 VersionT1 ATM EnhancedDaughtercardE1 ATM EnhancedDaughtercardOn position selects 75 Ω. Off position selects 120 Ω.1O 2N1O 2N
