1645
Chapter 2
User manual
Installing and connecting the 1645
20
2.6
Connection precautions
ESD WARNING
The circuit boards are sensitive to electrostatic discharges (ESD) and should be handled with care. It is
advisable to ensure an optimal electrical contact between yourself, the working area and earth before
touching any circuit board. Take special care not to touch any component or connector on the circuit
board.
NOTE
This unit may be powered by an
IT power system
.
For the definition of an
IT power system
, refer to
Annex V - AC power distribution systems
of
EN60950-
1
, section
V.4 IT power distribution systems
.
The connectors of the 1645 should only be connected to the following circuit types:
• Inside building circuit: Circuit remaining inside building and not subject to telecom network primary
nor secondary lightning strikes.
• Outside building circuit: Circuit routed going outside building and possibly subject to telecom network
secondary lightning strikes.
• SELV or
Safety Extra Low Voltage
: Inside building circuit designed to not exceed safe voltage value.
• TNV or
Telecom Network Voltage
: User's accessible internal circuit designed to not exceed specified
voltage limits:
- TNV-3 : Outside building circuit exceeding SELV voltage limits but respecting TNV voltage limits
Interface type
Interface identification
Connector type
Circuit type
SHDSL
DSL 1-2
DSL 3-4
RJ11
TNV-3
ADSL2+/VDSL2
VDSL / ADSL
RJ11
TNV-3
LAN
1
1. 4 port Ethernet switch with 10/100/1000 Base T ports
ETH1 1...4
RJ45
SELV
UTP
2
2. Ethernet 10/100/1000 Base T port
ETH2 UTP
ETH3 UTP
RJ45
RJ45
SELV
SELV
SFP slot
3
3. Gigabit Ethernet slot
ETH2 SFP
ETH3 SFP
SFP slot
SFP slot
-
-
RS232
4
4. V.24
Console
RJ45
SELV
USB
5
5. USB
master
port
USB
SELV
