C o n f i g u r a t i o n 552 Type “1” to select ESF Frame Mode, or “2” to select D4 Frame mode.The IAD resets the interface and redisplays the T1 Frame Mode menu.3 Press Escape to return to the T1 Configuration menu.4 Continue with other configuration tasks.Select Transmit LineBuild OutTo select Line Build Out, follow the steps below.1 Type “2” on the T1 Configuration menu (Figure 4.12) to display the LineBuild Out menu.Figure 4.14 Select Line Build Out Menu2 Type the option to select the line build out that corresponds to the T1 spanlength in use. The IAD resets the interface and redisplays the Select LineBuild Out menu.3 Press Escape to return to the T1 Configuration menu and continue withother configuration tasks.Select B8ZS or AMI To select B8ZS or AMI, follow the steps below.1 To set zero suppression, type “4” on the T1 Configuration menu (Figure4.12) to select B8ZS or AMI. The IAD displays the current setting andprompts you to change it.2 Type “Y” to change the setting.3 Press Escape to return to the T1 Configuration menu and continue withother configuration tasks.Configure Loopback To configure loopback, follow the steps below.1 Type “5” on the T1 Configuration menu (Figure 4.12) to configureloopback. The IAD displays the current setting for each type of loopbackand ESP loopback commands, and the Loopback Configuration menu.2 Type the option number “1”, “2” or “3” to enable or disable OutwardPayload, Outward Line, and Inward Line Loopback. Inward Loopback isvalid only when the IAD is in Master Mode. The IAD makes the change andresets the interface.