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4

Hardware

Power supply

12 V DC, external power adapter (230 V); bayonet connector to secure against disconnection

Power consumption

Max. ca. 14 W

Environment

Temperature range 0–35 °C; humidity 0–95 %; non-condensing

Housing

Robust plastic housing, rear connectors, ready for wall mounting, Kensington lock; measures 210 x 45 x 140 
mm (W x H x D)

Number of fans

One quiet fan

Interfaces

LANCOM 1783VA-4G over ISDN

LANCOM 1783VA-4G over POTS

WAN: VDSL2

a

 

VDSL2 as per ITU G.993.2; profiles 8a, 8b, 8c, 8d, 

12a, 12b, 17a

a

 

Compatible to VDSL2 from Deutsche Telekom

a

 

ADSL conformity according to: ADSL2+ over ISDN 
as per ITU G.992.5 Annex B/J with DPBO, ADSL2 
over ISDN as per ITU G.992.3 Annex B, ADSL over 
ISDN as per ITU G.992.1 Annex B.

a

 

Supports just one virtual connection at a time in 
ATM (VPI-VCI pair)

a

 

VDSL2 as per ITU G.993.2; 

profiles 8a, 8b, 8c, 8d, 12a, 12b, 17a

a

 

ADSL conformity according to: ADSL2+ over POTS 
as per ITU G.992.5 Annex A / Annex M with DPBO, 
ADSL2 over POTS as per ITU G.992.3 Annex A/L, 
ADSL over POTS as per ITU G.992.1 Annex A.

a

 

Supports just one virtual connection at a time in 
ATM (VPI-VCI pair)

ETH

4 individual ports, 10 / 100 / 1000 Mbps Gigabit Ethernet, by default set to switch mode. Up to 3 ports can 

be operated as additional WAN ports. Ethernet ports can be electrically disabled in the LCOS configuration.

ISDN 1 / ISDN 2

ISDN 1:  Internal (NT) or external (TE) ISDN bus. This feature is controlled by LCOS.
According to the settings, connect the light-blue ISDN cable either to the NTBA or the ISDN terminal device. 
ISDN 2: Internal (NT) ISDN bus. Use the light-blue ISDN cable to connect the ISDN interface to the ISDN 
device.

Analog 1 / Analog 2

Use the cable of your analog devices to connect them with the analog interfaces. If necessary, use the 
enclosed adapter.

Serial interface

Serial configuration interface / COM-port (8-pin mini-DIN): 9,600 - 115,200 baud, suitable for optional 

 

connection of analog / GPRS modems. Supports internal COM-port server and provides transparent  
asynchronous serial-data transfer via TCP.

4G: Ant1, Ant2

Two SMA connectors for the supplied dipole rod antennas (LTE, UMTS), compatible LANCOM AirLancer  
antennas for 4G or 3G, or from other manufacturers. Please respect the restrictions that apply in your country 
when setting up an antenna system (in particular the antenna gain and transmission power).

WAN protocols

VDSL, ADSL, Ethernet

PPPoE, PPPoA, IPoA, Multi-PPPoE, ML-PPP, PPTP (PAC or PNS) and IPoE (with or without DHCP), RIP-1, RIP-2, 

VLAN, GRE, L2TPv2 (LAC or LNS), IPv6 over PPP (IPv6 and IPv4/IPv6 dual stack session), IP(v6)oE 

 

(autoconfiguration, DHCPv6 or static)

ISDN

DSS1 (Euro-ISDN), PPP, X75, HDLC, ML-PPP, V.110/GSM/HSCSD

Data transmission in cellular networks

Supported standards:

GPRS, EDGE, UMTS, HSxPA, HSPA+, LTE

LTE

Band 1 (2100 MHz), band 3 (1800 MHz), band 7 (2600 MHz), band 8 (900 MHz),

band 20 (FDD800 MHz) with MIMO

UMTS/HSxPA/HSPA+

Band 1 (2100 MHz), band 8 (900 MHz) with diversity

EDGE/GPRS

GSM 900 (900 MHz), DCS 1800 (1800 MHz), PCS 1900 (1900 MHz)

Max. transm. power

+24 dBm

Declaration of Conformity

Hereby, LANCOM Systems declares that this radio equipment is in compliance with Directive 2014/53/EU. The full text of the EU declarati-
on of conformity is available at the following internet address: www.lancom-systems.com/ce/

Package content

Documentation

Quick Reference Guide (DE/EN), Installation Guide (DE/EN)

Cable

1 Ethernet cable, 3 m (kiwi-colored connectors); 
for ISDN: 1 DSL cable for an IP-based line, 4.25m, 1 ISDN cable, 3 m (light-blue connectors); 
for over POTS: 1 DSL cable, 3 m (dark-blue connectors) 

Adapters

2 TAE adapters (RJ11 - TAE)

Antennas

2 LTE / 4G antennas for LTE / UMTS

Power adapter

External power supply adapter (230 V); NEST 12 V / 1.5 A DC/S; barrel connector 2.1 / 5.5 mm bayonet; 
LANCOM item no. 111301 (EU, 230 V); LANCOM item no. 111302 (UK, 230 V)

LANCOM 1783VA-4G

DSL

ETH 2

Power

ETH 1

Online

ISDN 1

ETH 4

ETH 3

VPN

Analog 1

Analog 2

ISDN 2

Reset

VoIP

4G

a

 

Power

Off

Device switched off

Green, permanently*

Device operational, resp. device paired / claimed 
and LANCOM Management Cloud (LMC) 
accessible

Green / red, blinking

Configuration password not set. Without a 
configuration password, the configuration data in 

the device is unprotected.

Red, blinking

Charge or time limit reached

1x green inverse 
blinking*

Connection to the LMC active, pairing OK, device 
not claimed

2x green inverse 
blinking*

Pairing error, resp.  
LMC activation code not available

3x green inverse 
blinking*

LMC not accessible, resp.  
communication error

b

 

Online

Off

WAN connection inactive

Green, permanently

WAN connection active

Red, permanently

WAN connection error

c

 

DSL

Off

Interface deactivated

Green, permanently

DSL connection active

Green, flickering

DSL data transfer

Red, flickering

DSL transfer error

Red/orange, blinking

DSL hardware error

Orange, blinking

DSL training

Orange,  permanently

DSL sync

Green, blinking

DSL connecting

d

 

Analog

Off

Interface deactivated

Green, permanently

Interface activated

Orange, blinking

Incoming call

Green, blinking

Connection active

f

 

ETH

Off

No networking device attached

Green, permanently

Connection to network device operational, no 

data traffic

Green, flickering

Data transmission

Please observe the  
following when setting 
up the device

a

  For devices to be 

operated on the 
desktop, please attach 
the adhesive rubber 
footpads

a

  Do not rest any objects 

on top of the device and 
do not stack multiple 
devices

a

  Keep the ventilation 

slots on the side of 
the device clear of 
obstruction

a

  In case of wall 

mounting, use the 
drilling template as 
suppliedn

a

  Rack installation with 

the optional LANCOM 
Rack Mount (not 
supplied)

LANCOM 1681V

Power

VDSL

Online

ETH 

1

ETH 2 

VP

N

ETH 

3

ETH 4 

 

ISDN Statu

s

This product contains separate open-source software components which are 
subject to their own licenses, in particular the General Public License (GPL). The 

license information for the device firmware (LCOS) is available on the device‘s 
WEBconfig interface under “Extras > License information“. If the respective 
license demands, the source files for the corresponding software components 

will be made available on a download server upon request.

MOUNTING AND CONNEC

TING THE DEVICE

LANCOM, LANCOM S

ystems and L

COS ar

e r

egister

ed tr

ademarks. All other names or descriptions used may be tr

ademarks or r

egister

ed 

 

trademarks of their owners. Subject to change without notice. No liability for technical err

ors and/or omissions.                111653/0817 

TECHNIC

AL DET

AILS

a

c

e

b

g

f

d

hi

j

LANCOM 1783VA-4G

Quick Reference Guide

Cloud-ready

Gigabit Ethernet 10/100/1000

ISDN 1

ISDN 2

TE / NT

NT

VDSL / ADSL

Analog1

Analog2

e

b

g

g

 

4G

Off

Cellular interface disabled

Green, permanently

Connection to cellular network active

Green, flickering

Cellular data transfer

Orange, permanently

Logon to cellular network successful

Orange, blinking

Logging on to cellular network

Red, permanently

Hardware error/module unavailable

Red / green, blinking

SIM card error (PIN)

Red / orange, blinking

Uploading module firmware

h

 

VoIP

Off

No SIP accounts defined or VCM is off

Green, permanently

All defined and active SIP accounts (outgoing) 

registered successfully

Red, permanently

Not all of the defined and active SIP accounts 

were registered (possibly still in process)

Red or green, 

inverse flashing

Number of currently used lines (connecting or 
connected)

*) The additional power LED statuses are displayed in 5-seconds rotation if the 

device is configured to be managed by the LANCOM Management Cloud.

i

 

VPN

Off

VPN connection inactive

Green, permanently

VPN connection active

Green, flashing

VPN connecting

j

 

Reset

Reset button

Operated e.g. with a paper clip 

> Short press: Restart the device

 

> Long press: Reset the device

e

 

ISDN

Off

Interface deactivated

Green, permanently

D-channel active

Green, blinking

ISDN connected

Red, flickering

ISDN transfer error

Red/orange, blinking

ISDN hardware error

Red, permanently

ISDN connection not enabled

Orange, blinking

ISDN connecting

h

a

LTE / 4G antennas

Connect the two supplied cellular 
antennas to the connectors located  

at the device‘s sides.

b

VDSL / ADSL interface*

Use the supplied DSL cable for the 
IP-based line to connect the VDSL 
interface and the provider’s telephone 
socket. For more information, please 
contact your Internet service provider.

*For operation with over POTS devices  
please use the DSL cable with the dark 
blue plugs.

c

Ethernet interfaces

Use the cable with the kiwi-colored 
connectors to connect one of the  
interfaces ETH 1 to ETH 4 to your PC, 
an IP telephone or a LAN switch.

d

Analog interfaces

Connect analog terminal devices to  
the analog interfaces either directly  
via RJ11 or with the help of the  
enclosed TAE adapter.

e

Serial interface 

Configuring the device via the serial interface 
requires a serial configuration cable

 

(available as an accessory).

f

ISDN interfaces 

ISDN 1: Internal (NT) or external (TE) ISDN bus. 
This feature is controlled by LCOS.
ISDN 2: Internal (NT) ISDN bus. 

A 100-Ohm resistor for line termination is 
switchable in LCOS.

g

Power

When connecting the cable to the device, turn 
the bayonet connector 90° clockwise until it 
clicks into place.
Use only the supplied power adapter.

h

SIM card slot (bottom side of the device)

Release the SIM-card holder and lever it 
upwards. Slide the SIM card into the guide slot 
of the SIM-card holder. Press the holder down 
until it clicks into place.

SIM

a

a

c

d

f

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