Front Panel Operation; Control Port Operation; Figure 5. Rs-232 (Db-9) Connector Pinout - ADTRAN T200 H2TU-R Installation And Maintenance Manual

5. FRONT PANEL OPERATION

The front panel contains two pushbuttons on the
faceplate. These are labeled "LBK" and
"OPT."
The LBK pushbutton controls a bidirectional loopback
at the H2TU-R. Pressing the button causes a
bidirectional loopback to occur. If the bidirectional
loopback is active, pressing the button a second time
will disable the loopback.
The OPT pushbutton controls the Customer Loss of
Signal response. Press the button to toggle the setting
between a Network Loopback and AIS. The front
panel LED labeled "AIS/LP" indicates the current
setting.

6. CONTROL PORT OPERATION

The H2TU-R provides a faceplate-mounted DB-9
connector that supplies an RS-232 interface for
connection to a controlling terminal. The pinout of
the DB-9 is illustrated in Figure 5.
1
6
2 TXD (Transmit Data)
7
3 RXD (Receive Data)
8
4
9
5 SGN (Signal Ground)

Figure 5. RS-232 (DB-9) Connector Pinout

The terminal interface operates at data rates from
1.2 kbps to 19.2 kbps. A terminal session is initiated
by entering multiple space bar characters which are
used by the H2TU-R to determine the rate of the
terminal. The asynchronous data format is fixed at 8
data bits, no parity, and 1 stop bit.
NOTE
When operating in Virtual Terminal Mode, the
terminal baud rate should be 4.8 kbps or higher.
6
The H2TU-R supports two types of terminal
emulation modes. The Manual Update Mode is a
dumb terminal mode, where the user can utilize print
screen and log file commands easily. This mode also
includes a message on the top of the terminal screen
(3 SPACES TO UPDATE).
Pressing "CTRL" and "T" while on any screen
will toggle between the Manual and Real Time
Terminal Modes.
The Real Time Update Mode is a VT100 terminal
mode. This mode enables all screens highlighting and
cursor placement. Print screen and log file commands
are not available in this mode.
The default terminal mode is Real Time Update
Mode.
If you are using a personal computer (PC) with
terminal emulation capability, be sure to disable
any power-saving programs.
communication between the PC and the HDSL2
unit may be disrupted, resulting in misplaced
characters or screen time outs.
Section 61222026L7-5, Issue 2
NOTE
NOTE
Otherwise,
61222026L7-5B