Introduction
OPERATION
Nonvolatile memory holds two sets of user defined operating configurations. Options and functions are selected from the front panel or by AT commands. A menu driven 32-character liquid crystal display (LCD) provides command feedback as well as real time displays. UTA220 operation is monitored by six light emitting diodes (LEDs) on the front panel.
The UTA220 and UTA220 have four methods of operation.
•The UTA220 is programmed from the front panel using three push buttons, YES, NO, and HOME. The UTA220 has a numeric keypad that includes the additional function keys; CALL / HANGUP and ENTER;
•V.25 bis dialer functions and AT commands are performed on the EIA-232 or V.35 interfaces.
•EIA-366 dialer functions are performed on the optional upper ports.
PHYSICAL DESCRIPTION
The UTA220 is manufactured as a stand-alone desktop unit and as a rack-mount insert card. This manual applies to either unit. Figure 1-1 shows the front panel controls and indicators.
Figure 1-1. Front Panel UTA220
The standard UTA220 rear panel (Figure 1-2) houses two
25-pin D-type connectors for the DTE interface, an 8-pin ISDN U modular connector (U interface), the ON/OFF toggle switch, line fuse, and power control. The UTA220 can be ordered with a V.35 interface, in which case adapters should be connected to the 25-pin D-type connectors (Figure 1-3).
