ADTRAN 1200063L1, Manual

Page: 43 / 137

Chapter 3. Operation
61200063L1-20 DSU III TDM User Manual 3-13
REAR PANEL
The DSU III TDM is equipped with four EIA-232 connectors labeled PORT
1
through PORT 4, used to connect to DTE equipment. The EIA-232 inter-
face is provided on four standard DB-25 connectors. Pin assignments for
the DTE and network connections are described in the appendix Pinouts
on page A-1. The DSU III TDM rear panel is shown in Figure 3-4 .
Figure 3-4. DSU III TDM Rear View
Item Function
Port 1 - Port 4 DTE connection
Power switch Used to turn power on or off
Main telco connector Connection to the dedicated circuit
Backup telco connector Connection to dial backup
Chain in
Reserved for future use
Chain out Reserved for future use
115 VAC connection Power cord connection
ON
OFF
115VAC 60HZ.15A
PORT 1
PORT 2 PORT 4
PORT 3 MAIN BACKUP
CHAIN OUT CHAIN IN
CONTROL
TELCO