ADTRAN 1200051L6, 61200051L1, 1200051L2, 1200051L5 user manual Setting Auto Answer

Chapter 6. Configuration

The first byte of each packet contains all ones (A = FF HEX), and the second byte of each packet (the C byte) is either 13 HEX or 03 HEX if not the final packet.

V.25 SYNC BISYNC Dialing

To set the Dial Options for V.25 BISYNC, choose 3=V.25 BISYNC from the front panel or the VT 100 terminal (see Figure 6-8 for menu tree). This setting allows for V.25 bis messages in byte syn- chronous format (BISYNC). V.25 bis specifies that the characters should be ASCII, 7 bits, and odd parity. This setting allows syn- chronous data terminal equipment which does not use HDLC to support serial inband dialing.

V.25 HDLC FLAG

To set the Dial Options for V.25 HDLC FLAG, choose 4=V.25 HDLC FLAG from the front panel or the VT 100 terminal (see Fig- ure 6-8 for menu tree). Configuring the ISU 2x64 for HDLC FLAG V.25 bis enables in-band dialing over a DTE interface using standard synchronous HDLC V.25 bis commands with 7E HEX idle.

Disabled

This selection disables in-band dialing over the DTE interface.

Setting Auto Answer

Auto answer is configured separately for both DTE#1 and DTE#2. Using the front panel, select the appropriate DTE with either arrow key and press Enter. When using a VT 100 terminal, select the option number corresponding to the appropriate DTE and press Return.

The ISU 2x64 can be configured to automatically answer in one of three ways: Disabled, Enabled, or Dump all calls.

Disabled

When Disabled is selected, the ISU 2x64 will not answer the call. The AT answer command (ATA) must be issued to the ISU 2x64 for it to accept the incoming call or by selecting Answer Call from dial menu. The ringing call can be dumped by using the

42 ISU 2x64 Dual Port ISDN Service Unit User Manual 61200051L1-1D