CM520-3XX V4.0 — Industrial 5G Gigabit router family
Source filename V4.0 | 22 May 2026 | standard edition · Technical review edition · PDF
CAIMORECM520-3XX router series
Gigabit industrial cellular router
A 5G gigabit industrial router series for cellular network integration. The official software specification lists APN/VPDN access and IPsec/OpenVPN functions; select the exact modem and interface configuration for the project.
- Network access
- APN / VPDN
- DC input
- 6–32 V DC
- Operating temperature
- −35 to +75 °C
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Technical specifications
Options vary by model, hardware revision and firmware.
Key specifications
| Network access | APN / VPDN |
|---|---|
| DC input | 6–32 V DC |
| Operating temperature | −35 to +75 °C |
Model and modem-platform selection
CM520-3XX V4.0 — Industrial 5G Gigabit router family · Source filename V4.0 | 22 May 2026 | standard edition · Source pp. 1-2
| CM520-31FS | Modem platform: Qualcomm platform; Cellular modules: 1 x 5G; 2.4 GHz Wi-Fi: Yes; 5.8 GHz Wi-Fi: No |
|---|---|
| CM520-31FS-GC | Modem platform: Domestic platform; Cellular modules: 1 x 5G; 2.4 GHz Wi-Fi: Yes; 5.8 GHz Wi-Fi: No |
| CM520-32FS | Modem platform: Qualcomm platform; Cellular modules: 1 x 5G; 2.4 GHz Wi-Fi: No; 5.8 GHz Wi-Fi: Yes |
| CM520-32FS-GC | Modem platform: Domestic platform; Cellular modules: 1 x 5G; 2.4 GHz Wi-Fi: No; 5.8 GHz Wi-Fi: Yes |
| CM520-37FS | Modem platform: Qualcomm platform; Cellular modules: 1 x 5G; 2.4 GHz Wi-Fi: Yes; 5.8 GHz Wi-Fi: Yes |
| CM520-37FS-GC | Modem platform: Domestic platform; Cellular modules: 1 x 5G; 2.4 GHz Wi-Fi: Yes; 5.8 GHz Wi-Fi: Yes |
| CM520-35FS | Modem platform: Qualcomm platform; Cellular modules: 4G + 5G; 2.4 GHz Wi-Fi: Yes; 5.8 GHz Wi-Fi: No |
| CM520-35FS-GC | Modem platform: Domestic platform; Cellular modules: 4G + 5G; 2.4 GHz Wi-Fi: Yes; 5.8 GHz Wi-Fi: No |
| CM520-34FS | Modem platform: Qualcomm platform; Cellular modules: 4G + 5G; 2.4 GHz Wi-Fi: No; 5.8 GHz Wi-Fi: Yes |
| CM520-34FS-GC | Modem platform: Domestic platform; Cellular modules: 4G + 5G; 2.4 GHz Wi-Fi: No; 5.8 GHz Wi-Fi: Yes |
| CM520-36FS | Modem platform: Qualcomm platform; Cellular modules: 4G + 5G; 2.4 GHz Wi-Fi: Yes; 5.8 GHz Wi-Fi: Yes |
| CM520-36FS-GC | Modem platform: Domestic platform; Cellular modules: 4G + 5G; 2.4 GHz Wi-Fi: Yes; 5.8 GHz Wi-Fi: Yes |
Additional configurations
CM520-3XX V4.0 — Industrial 5G Gigabit router family · Source filename V4.0 | 22 May 2026 | standard edition · Source pp. 1-2
| Other modules | 1.8 GHz integrated public/private-network module and dual-5G module configurations are also stated, without an explicit dual-5G model number. |
|---|---|
| SIM configuration | Single module / single SIM, or dual-module SIM configurations, . Exact slot count depends on the ordered hardware. |
Network connectivity and IP functions
CM520-3XX V4.0 — Industrial 5G Gigabit router family · Source filename V4.0 | 22 May 2026 | standard edition · Source pp. 5-8
| Network access | APN / VPDN |
|---|---|
| Authentication | CHAP / PAP / MS-CHAP / MS-CHAPv2 |
| Radio system | See cellular radio specifications. |
| LAN protocols | ARP / Ethernet |
| IP applications | Ping, traceroute, DHCP server/relay/client, DNS relay, DDNS, Telnet, SSH, HTTPS, TFTP, FTP and SFTP. |
| Routing | Static and dynamic routes. |
Security and reliability
CM520-3XX V4.0 — Industrial 5G Gigabit router family · Source filename V4.0 | 22 May 2026 | standard edition · Source pp. 5-8
| Firewall | Stateful packet inspection (SPI), denial-of-service (DoS) protection, multicast/Ping filtering and access-control lists (ACL). IP/MAC combined access authentication. |
|---|---|
| Address translation | NAT, PAT, DMZ, port mapping and virtual servers. |
| Users / AAA | User privilege levels; local authentication, RADIUS, TACACS+ and LDAP. |
| Data security | CA support, including automatic application; SM1/SM2/SM3/SM4 algorithms. |
| Backup | VRRP, interface backup and dual-SIM backup; actual SIM/modem configuration depends on ordered variant. |
| Link monitoring | Heartbeat checks and automatic reconnection. |
| Watchdog | Operating self-check and fault self-recovery. |
Management and optional integration
CM520-3XX V4.0 — Industrial 5G Gigabit router family · Source filename V4.0 | 22 May 2026 | standard edition · Source pp. 5-8
| WLAN | Marked optional in the software-table heading; confirm ordered configuration. |
|---|---|
| Configuration | Local/remote HTTPS, Telnet and SSH. |
| Source row titled Upgrade method | Local/remote log output and retention after power loss; heading/content mismatch Confirmation required. |
| SMS, optional | Status inquiry, configuration and restart. |
| On-demand dialing | Data-triggered or SMS-triggered connection; scheduled online/offline operation. |
| Management | SNMP |
| Development / platforms, optional | Python custom development; AWS, Alibaba Cloud, Tencent Cloud and power-industry platforms. |
| Industrial protocols, optional | Modbus TCP, Modbus RTU, EtherNet/IP and Modbus TCP Slave. |
Additional WLAN and management features
CM520-3XX V4.0 — Industrial 5G Gigabit router family · Source filename V4.0 | 22 May 2026 | standard edition · Source pp. 5-8
| Optional WLAN standards | IEEE 802.11ac/a/b/g/n |
|---|---|
| WLAN security | Open system, shared key, WPA/WPA2 authentication; WEP/TKIP/AES encryption. |
| WLAN modes | AP and Client. |
| DM | Central management and batch configuration. |
| Diagnostics | Ping, traceroute and Sniffer packet capture. |
Security and reliability additions
CM520-3XX V4.0 — Industrial 5G Gigabit router family · Source filename V4.0 | 22 May 2026 | standard edition · Source pp. 5-8
| Data security | CA support, including automatic application ; SM1/SM2/SM3/SM4 cryptographic algorithms. |
|---|---|
| VPN | IPsec, L2TP, PPTP, GRE, N2N, L2TP over IPsec, GRE over IPsec, EOIP and OpenVPN. |
| Hardware encryption | State Grid, China Southern Power Grid and Chinese commercial-cryptography encryption support, . Exact algorithms, modules and approvals require confirmation. |
| Bandwidth aggregation | Two-SIM and three-SIM bandwidth aggregation are claimed in the software table. Hardware and service prerequisites are unspecified; this is not inferred from a single-modem dual-SIM selection row. Confirmation required. |
| Link health | Online maintenance, heartbeat detection and automatic reconnection. |
| Management | SNMP and power-industry TR-069 management; DM central management and batch configuration. |
| DHCP / translation | DHCP server/client; SNAT/DNAT port mapping; DMZ. |
Communication, Wi-Fi and access functions
CM520-3XX V4.0 — Industrial 5G Gigabit router family · Source filename V4.0 | 22 May 2026 | standard edition · Source pp. 5-8
| Transport | 5G/4G/3G; Ethernet-to-cellular; Ethernet-to-Wi-Fi; serial/RS485-to-cellular, Wi-Fi and Ethernet. |
|---|---|
| Transparent services | DTU and MQTT transparent transfer; APN/VPDN; VXLAN. |
| Link backup | Wired/cellular mutual backup; Wi-Fi/cellular primary/backup. |
| Health checks | Online maintenance and DTU LAN-client heartbeat packets. |
| Radio restrictions | Cellular frequency locking and SIM locking, as named in source. |
| Wi-Fi access | Client-count limits and client isolation. |
| Multiple SSIDs | Up to four Wi-Fi names, each with an independent MAC address. |
| Identity / controls | MAC and serial-number persistence; access restrictions; port alarms. |
| Positioning | BeiDou-only, GPS-only and combined GPS/BeiDou. Optional in this software list. |
Optional customized and platform functions
CM520-3XX V4.0 — Industrial 5G Gigabit router family · Source filename V4.0 | 22 May 2026 | standard edition · Source pp. 5-8
| Three-link backup | Wired, Wi-Fi and cellular links as mutual primary/backup. |
|---|---|
| IP traffic splitting | Distribute flows by source/destination IP across network links, servers or paths to reduce congestion and improve utilization/stability. |
| Wi-Fi diagnostics | Client signal-strength monitoring. |
| Session records | Online/offline timestamps for wired, cellular and Wi-Fi users. |
| TF security | Software encryption for TF cards. Physical TF-slot availability depends on hardware. |
| Product customization | Customer-customized product log and model identifier, as written; whether log means logo Confirmation required. |
| Central platform | Remote parameters, OTA, remote multimedia updates (music/video/advertising), allow/block lists, traffic and online statistics, radio-system statistics, SMS/WeChat/Wi-Fi authentication, traffic and speed controls, time limits, Internet-behavior controls, Wi-Fi probe and multi-level user management. Backend/platform scope requires configuration review. |
Optional development and industrial protocols
CM520-3XX V4.0 — Industrial 5G Gigabit router family · Source filename V4.0 | 22 May 2026 | standard edition · Source pp. 5-8
| Development / clouds | Python custom development; Amazon AWS, Alibaba Cloud, Tencent Cloud and power-industry platforms. |
|---|---|
| Industrial protocols | Modbus TCP; Modbus TCP/RTU conversion; Modbus RTU; EtherNet/IP; Modbus TCP Slave; MQTT; Ntrip Client and Ntrip Server. |
| Power-industry protocols | 101/104, 645, 61850 and TR-069. Identifiers are translated as written without inferring unspecified editions or conformity. |
| Environmental protocol | HJ212-2005/2017. |
Cellular parameters
CM520-3XX V4.0 — Industrial 5G Gigabit router family · Source filename V4.0 | 22 May 2026 | standard edition · Source pp. 9-10
| Wireless module | Industrial-grade module. |
|---|---|
| 5G SA/NSA bands | n1/n2/n3/n5/n7/n8/n20/n28/n41/n66/n71/n77/n78/n79 |
| TDD frequency group | LTE TDD: 2600/2300 MHz; UMTS: 2100/900 MHz; GSM: 850/900/1800/1900 MHz; UMTS Rx diversity: 2100/900 MHz. |
| FDD frequency group | LTE FDD: 2600/2100/1800/DD800 MHz (DD800 reproduced as printed); UMTS and UMTS Rx diversity: 2100/900 MHz. |
| Radio schemes | NR/LTE/UMTS/HSPA+/HSDPA/HSUPA/WCDMA/EDGE/GSM |
| 5G NR rate | DL 3.4 Gbps / UL 350 Mbps. Modem theoretical figures, not Ethernet throughput. |
| TDD rates | LTE TDD: DL 68 Mbps / UL 17 Mbps; DC-HSPA+: DL 42 Mb/s (Category 24); HSPA+: DL 28 Mb/s (Category 18); HSDPA: DL 14.4 Mb/s (Category 8); HSUPA+: DL 5.76 Mb/s (Category 6), as printed; WCDMA CS: UL/DL 64 kbps; WCDMA PS: UL/DL 384 kbps. |
| FDD rates | LTE FDD: DL 100 Mbps / UL 50 Mbps; other DC-HSPA+, HSPA+, HSDPA, HSUPA+ and WCDMA values are the same as the TDD table. |
| Transmit power | LTE: 23 dBm; WCDMA/HSDPA: 24 dBm. |
| Receiver sensitivity | <-109 dBm |
| module functions | Data, voice, SMS and fax. |
| Power private network | 1.8 GHz power-industry private-network bands and integrated public/private-network modules. |
| Overseas options | The source claims broad international band coverage. Specify destination country and required bands before contracting so the manufacturer can select the appropriate optional module; no universal band/certification coverage is inferred. |
Wi-Fi parameters
CM520-3XX V4.0 — Industrial 5G Gigabit router family · Source filename V4.0 | 22 May 2026 | standard edition · Source pp. 9-10
| Module | Integrated chipset Wi-Fi module, described as highly integrated and stable. |
|---|---|
| Standards / rates | 802.11 b/g/n/ac; 6/9/12/18/24/36/48/54/450 Mbps; maximum stated 600 Mbps. The source does not allocate these rates to each band/variant. |
| Encryption | WEP, WPA and WPA2; source lists 802.11i 4.0, TKIP, AES and CCMP hardware security engines. |
| Modes | AP and repeater. |
| Coverage claim | Up to 100 m outdoors without obstructions; conditions not specified. Confirmation required. |
Hardware
CM520-3XX V4.0 — Industrial 5G Gigabit router family · Source filename V4.0 | 22 May 2026 | standard edition · Source pp. 10-11
| CPU | 880 MHz industrial embedded processor with MMU; design section specifies dual core, 32 KB D-cache / 32 KB I-cache. |
|---|---|
| Flash / SDRAM | 256 Mbit / 4 Gbit; larger capacities available on request. |
Power
CM520-3XX V4.0 — Industrial 5G Gigabit router family · Source filename V4.0 | 22 May 2026 | standard edition · Source pp. 10-11
| DC input | 7-60 V; reverse-polarity, overvoltage and overcurrent protection. |
|---|---|
| Optional PoE | Four LAN PoE outputs; interface row states PoE+, up to 25 W per port. Total output budget is not specified. |
| Source supply rows | 4G: 9 V DC / 1.33 A; 5G: "DC12A/2A", exactly as printed; PoE: 48 V DC / 2 A. The 5G voltage unit is malformed: Confirmation required. Supplies vary by model and actual shipment. |
| Communication current | Average 650 mA at +9 V DC; registration peak 1.0 A at +9 V DC. |
| Standby | Average <350 mA at +9 V DC. |
Environment / mechanics
CM520-3XX V4.0 — Industrial 5G Gigabit router family · Source filename V4.0 | 22 May 2026 | standard edition · Source pp. 10-11
| Operating temperature | -35 to +75 °C |
|---|---|
| Storage | -40 to +85 °C |
| Humidity | 95%, non-condensing. |
| Enclosure | Metal, shielding, isolated enclosure/system, lightning protection; IP30 in the physical table, IP31 in reliability text. |
| Body | 142.2 x 122.8 x 43 mm; excludes antennas and mounting hardware. |
| Package | 324 x 240 x 75 mm |
| Weight | 0.554 kg; excludes antennas and adapter. |
| Shock / vibration / drop | IEC 60068-2-27 / IEC 60068-2-6 / IEC 60068-2-32 |
EMC parameters
CM520-3XX V4.0 — Industrial 5G Gigabit router family · Source filename V4.0 | 22 May 2026 | standard edition · Source pp. 10-11
Certification scope and test conditions depend on the selected model. Request the applicable documentation.
| ESD | EN 61000-4-2, level 3 |
|---|---|
| Radiated electric field | EN 61000-4-3, level 3 |
| Electrical fast transient | EN 61000-4-4, level 3 |
| Surge | EN 61000-4-5, level 3 |
| Conducted disturbances | EN 61000-4-6, level 3 |
| Power-frequency magnetic field | EN 61000-4-8; horizontal/vertical 400 A/m (level 3), . Confirmation required. |
certificates
CM520-3XX V4.0 — Industrial 5G Gigabit router family · Source filename V4.0 | 22 May 2026 | standard edition · Source pp. 10-11
Certification scope and test conditions depend on the selected model. Request the applicable documentation.
| Domestic | Ministry of Public Security certificate; MIIT network-access permit; CRCC; Ministry of Housing and Urban-Rural Development interoperability certificate; CCC; radio-committee certificate; EMC; high/low-temperature testing. |
|---|---|
| International | CE, FCC, E-mark, CB, RoHS and Japan TELEC. |
| Scope | Certificate identifiers, current validity and exact model/module scope Confirmation required. |
System connectivity
From field equipment to your system.
See how CM520-3XX router series fits into your installation.
Illustrative connection architecture. External equipment and customer software are shown for context. Interfaces and options vary by configuration.
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