ATL TELECOM USER GUIDE
AM2048A OS/OM
15
This chapter describes the basic steps that are required to set up a system using the DSL
Modem.
It is recommended that a pair of units is set up back-to-back and working correctly in the
desired operational mode before deployment.
4.1
CONNECTION OF PROTECTIVE EARTH
If it is required to connect the G.703 port to a circuit that is defined as TNV, then a protective
earth must be connected to the earth bond stud on the rear panel. See the Safety Statements
at the front of this User Guide.
If the unit is power fed then a functional earth must be connected to the earth bond stud on
the rear panel to provide a discharge path to ground for ESD protection. See the ESD warning
at the front of this User Guide.
4.2
POWER ON SEQUENCE
With no DTE or line connected to the AM2048 on power up, the following LED sequence
will be displayed:
Prior to the sequence starting, a random pattern may appear momentarily.
During sequence 1 to 7 the LEDs are illuminated in turn as an LED confidence test.
During stage 8 the test LED flashes as the internal self-test sequence is completed.
The flashing will normally last for about 4 seconds, however, if a new application has been
loaded this time will be extended by about 10 seconds while a backup copy of the application
is made.
With no external connections the unit will sense the loss of external signals, raise the urgent
alarm and stop at stage 9.When the system has been installed and is working correctly, the
unit should move to stage 10.
Urgent
Non-Urgent
Test
Power
1
2
3
4
5
6
7
8
9
10
4
I N S T A L L A T I O N
4
14
ATL TELECOM USER GUIDE
AM2048A OS/OM
On the rear panel there are the following connectors:
–48V DC supply inlet socket 3-pin mini-fit
Fibre interface
PC/SPC or ST or SC
Management port interface 9 way female D-type
Alarm interface
13 way circular DIN
Data Ports
(depending on module fitted)
G.703 120 Ohm
8-way RJ45
G.703 75 Ohm
BNC
X.21
15 way D-type female
V35
34 way MRAC female
10BaseT
8-way RJ45
10/100BaseT
8-way RJ45
USB
USB type B (Slave)
The data interface connector type will be from one of the four user-specified interfaces
available. They are detailed in section 7.6. The plastic housing contains the main PCB.
The plastic case has an internal metallised layer for EMC screening purposes. The membrane
front panel is attached to the main PCB with a flexible circuit connector.
Optional plug-top and in-line mains adapters are available with a 1.8 metre long DC lead,
terminating in a 3-pin mini-fit plug. Also available is a VT100 Management connection cable.
The overall dimensions of the unit are 274mm(L) x 251mm(W) x 55mm(H).
