Comset CM820Q-4 User manual

CM820Q-4 User Manual
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Industrial Grade 3G 4G 4GX Cellular Router
User Manual
CM820Q-4
Comset: 37/ 125 Highbury Rd, Burwood VIC 3125, Australia

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Table of Contents
1 Product Introduction ·························································································································································· 5
1.1 Product overview ············································································································· 5
1.2 Typical Application Diagram ···································································································· 5
1.3 Features ····································································································································· 6
2 Hardware Installation ························································································································································· 7
2.1 Overall Dimensions ·················································································································· 7
2.2 Ports············································································································································ 8
2.3 Powering up the CM820Q-4···································································································· 9
2.4 SIM/UIM card ···························································································································· 9
2.5 Terminal block ························································································································· 10
2.6 Grounding ································································································································ 10
2.7 Power Supply ·························································································································· 10
2.8 LED Description ······················································································································ 10
3 Software configuration ···················································································································································· 12
3.1 Overview ·································································································································· 12
3.2 How to log in to the Router ···································································································· 12
3.3 Router status ··························································································································· 15
3.3.1 Status overview ··················································································································· 15
3.3.2 Network status ····················································································································· 16
3.3.3 Firewall status ······················································································································ 19
3.3.4 Routes ··································································································································· 20
3.3.5 System log ···························································································································· 20
3.3.6 Kernel log ······························································································································ 21
3.3.7 Realtime graphs··················································································································· 22
3.4 System Configuration ············································································································· 22
3.4.1 Setup wizard ························································································································ 22
3.4.2 System ·································································································································· 26
3.4.3 Password ······························································································································ 29
3.4.4 Software ································································································································ 30
3.4.5 Backup/Restore ··················································································································· 30
3.4.6 Upgrade ································································································································ 31
3.4.7 Reset ····································································································································· 32
3.4.8 Reboot ··································································································································· 32
3.5 Services configuration ············································································································ 33
3.5.1 ICMP check ·························································································································· 33
3.5.2 VRRP ···································································································································· 34
3.5.3 Failover (link backup) ·········································································································· 35
3.5.4 DTU ······································································································································· 37
3.5.5 SNMP ···································································································································· 39
3.5.6 GPS (optional) ····················································································································· 41

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3.5.7 SMS ······································································································································· 43
3.5.8 VPN ······································································································································· 48
3.5.8.1 IPSEC ································································································································ 48
3.5.8.2 PPTP ·································································································································· 50
3.5.8.3 L2TP ··································································································································· 52
3.5.8.4 OpenVPN ·························································································································· 55
3.5.8.5 GRE tunnel ························································································································ 57
3.5.9 DDNS ···································································································································· 58
3.5.10 Connect Radio Module ····································································································· 60
3.6 Network Configuration ··········································································································· 62
3.6.1 Operation Mode ··················································································································· 62
3.6.2 Mobile configuration ············································································································ 63
3.6.3 Cell mobile data limitation ·································································································· 64
3.6.4 LAN settings ························································································································· 65
3.6.5 WAN ······································································································································ 68
3.6.6 WiFi Settings ························································································································ 69
3.6.6.1 Wifi General configuration ······························································································ 69
3.6.6.2 WiFi Advanced Configuration ························································································· 70
3.6.6.3 WiFi Interface Configuration ··························································································· 70
3.6.6.4 WiFi AP client ···················································································································· 72
3.6.7 Interfaces Overview ············································································································ 74
3.6.8 Firewall ·································································································································· 75
3.6.8.1 General Settings··············································································································· 75
3.6.8.2 Port Forwards ··················································································································· 75
3.6.8.3 Traffic rules ························································································································ 76
3.6.8.4 DMZ ···································································································································· 80
3.6.8.5 Security ······························································································································ 81
3.6.9 Static Routes ························································································································ 83
3.6.10 Switch ·································································································································· 84
3.6.11 DHCP and DNS ················································································································· 85
3.6.12 Diagnostics ························································································································· 87
3.6.13 Loopback Interface ··········································································································· 88
3.6.14 Dynamic Routing ··············································································································· 88
3.6.15 QoS ····································································································································· 91

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Copyright © COMSET 2023
Comset is a registered trademark of Comset. Other brands used in this manual are trademarks
of their registered holders.
Specifications are subject to change without notice. No part of this manual can be reproduced
without the consent of Comset. All rights reserved.
WARNING: Keep at least a 20 cm distance between the user’s body and the modem router
device.
Address: 37/ 125 Highbury Road, Burwood VIC 3125, Australia
Web:
https://www.comset.com.au
Phone: [phone]
Fax: [phone]

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Chapter 1
1 Product Introduction
1.1 Product overview
The Comset CM820Q-4 is an industrial grade 3G/4G/4GX LTE WiFi Modem Router based on the
latest OpenWrt platform. With download speeds of up to 150 Mbps and upload speeds of up to 50
Mbps, it is the perfect choice for a wide range of industrial applications.
The Comset CM820Q-4 is designed to suit Australian conditions. It supports the latest LTE
technology that performs fast and reliable data communication. It enables users to quickly create
a secure and fast wireless network. It features a built-in WiFi N300 with speeds of up to 300 Mbps,
one Ethernet WAN port for fixed internet connection and four Ethernet LAN ports. Other features
include VPN IPSEC, PPTP, L2TP and Open VPN to establish a secure connection over the 3G/4G
network.
The durable and rugged design makes the CM820Q-4 the router of choice for remote harsh
environments. The compact design, easy integration and advanced built-in features make it
suitable for a wide range of industrial M2M applications, including industrial automation, building
automation, smart metering, security, surveillance, transportation, health, mining and
environmental monitoring.
1.2 Typical Application Diagram
The Comset CM820Q-4 3G/4G/4GX Router is suitable for a wide range of machine-to-machine
applications (M2M). A good example is the connection of ATM machines, POS systems, IP
surveillance cameras and PLC controllers back to a server, over a secure 4G connection using
a secure VPN IPSEC tunnel, as illustrated in the diagram below.

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1.3 Features
The CM820Q-4 supports the following:
 LTE FDD B1/B2/B3/B4/B5/B7/B8/B28 and LTE TDD B40, with 3G fallback to DC-
HSPA+/HSPA+/HSPA/WCDMA B1/B2/B4/B5/B8.
 IEEE802.11b/g/n N300 Wi-Fi AP function, WDS bridging, WEP, WPA/WPA2
Personal/Enterprise, TKIP/AES, Authenticated encryption mode.
 RS232 interface data transparent transmission and protocol conversion.
 On-demand dialing, including time on/off-line, voice or SMS control on/off-line, data
trigger online or link idle offline.
 TCP/IP protocol stack, Telnet, HTTP, SNMP, PPP, PPPoE, network protocol.
 VPN IPSEC, PPTP, L2TP and Open VPN.
 Configuration via a user-friendly interface using a web browser.

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Chapter 2
2 Hardware Installation
1. Overall Dimensions
2. Accessories
3. Installation
2.1 Overall Dimensions

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2.2 Ports
Cell Main: Cellular Main
Cell Aux: Cellular Auxiliary
WiFi1: WiFi 1
SIM: SIM card slot
COM: DB9 serial port
LAN1~LAN4: Four LAN RJ45 Ethernet ports
WAN: WAN RJ45 Ethernet port
RST: System reset button
PWR: DC power socket. 5~40VDC
GND: DC wire ground
VCC: DC wire positive. Voltage range 5~40VDC
WPS: WPS button
WiFi2: WiFi 2

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2.3 Powering up the CM820Q-4
Please ensure the SIM card is inserted, and the antennas are connected before powering up
the router.
2.4 SIM/UIM card
If your router has a SIM/UIM card cover, please remove it, and have the SIM card
properly inserted.

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2.5 Terminal block
Please refer to the following table on Pin description relating to the terminal block:
Attention:
1. If you are not using the AC adapter supplied with the router, and if you wish to power
up the unit using the terminal block, the power cable should be wired with the correct
voltage polarity. Wrong wiring will destroy the equipment. Pin 1 and Pin 2 are reserved
for power, where Pin 2 is “GND” and PIN 1 is power input “Vin”(DC5~40V).
2.6 Grounding
To ensure safe operation, the cabinet where the router is installed should be grounded
properly.
2.7 Power Supply
The CM820Q-4 supports a wide range of DC voltage between 5 VDC and 40 VDC. The
router is supplied with a 12 VDC 1.5 A power adapter.
2.8 LED Description
Please refer to the following table for LED description.
LED Indication Light Description
SYS On for 25 seconds Solid green for 25 seconds after power up
Blinks System normal operation
Off or still on after 25
seconds
System set-up failure
LAN Blinks Ethernet data transmission
Off No Ethernet connection
PIN Signal Description Note
1 VCC +5-40V DC Input Current: 12V/1A
2 GND Ground

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On Ethernet is connected
VPN On VPN tunnel set-up
Off VPN tunnel not set-up or VPN failure
CELL On Solid orange light. Cell connection is ‘UP’ and
now you have access to the Internet
WIFI On WiFi enabled
Off WiFi disabled
WAN Blinks Ethernet data transmission
Off No Ethernet connection
On Ethernet is connected
Signal Off No signal, or signal checking is not ready
Blinks once every 4s Signal bar is 1
Blinks once every 3s Signal bar is 2
Blinks once every 2s Signal bar is 3
Blinks once every 1s Signal bar is 4
Blinks twice every 1s Signal bar is 5

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Chapter 3
3 Software configuration
1. Overview
2. How to log in to the router
3. How to configure the router
3.1 Overview
The CM820Q-4 router has a built-in WEB interface. Below are instructions on how to access
the web interface and configure the router.
3.2 How to log in to the Router
3.2.1 Network Configuration
The router’s default parameters are:
Default IP 192.168.1.1
Subnet mask 255.255.255.0
There are two ways to configure the IP address of your PC.
1) Manual settings
Set the PC IP to 192.168.1.xxx (xxx = 2~254), subnet mask: 255.255.255.0, default
gateway: 192.168.1.1, primary DNS: 192.168.1.1.

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2) DHCP settings
Choose “Obtain an IP address automatically” and “Obtain DNS server address
automatically”. Then click the ‘OK’ button.

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3.2.2 Log in to the router
 Open a Web browser and type http://192.168.1.1 into the address field, then press
“Enter”.
 Type in the username and password. Both Username and Password are “admin”.
Then click on the “Login” button.
To configure the router, you can skip the following section “Router status” and go straight to System>
Setup wizard which is covered in section 3.4.1

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3.3 Router status
3.3.1 Status overview
Click “Status” in the navigation bar, and then click “Overview”.

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3.3.2 Network status
The Network status page consists of 3 tabs, detailing information about the Mobile, WAN and
LAN interfaces.
Mobile interface page:

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WAN status page:

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LAN status page:
3.3.3 Firewall status
The Firewall status page shows the IPv4 and IPv6 rules and counters. Here, you can reset the
counters and restart the firewall functionality.

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3.3.4 Routes
The Routes page shows rules which are currently active on the router. An ARP table is
displayed as well.
3.3.5 System log
This page shows the system log from system boot up. The system log resets when the router
is restarted. You can export the system log by clicking the button “Export Syslog”.