Network Switches › ZTE Wantong S7850 · 4 chassis
ZTE WantongS7850 Series · Campus Core
Modular Core Switches · 4 Chassis Sizes · CLOS Architecture
ZTE Wantong S7850 · Core Switches
CLOS non-blocking modular core for campus and metro networks — four chassis from the 4U S7850-3 (3 service slots) to the 20U S7850-12 (12 service slots), with interface boards from gigabit copper to 6×100GE, M+N power redundancy and VSE 2.0 clustering. We engineer the slot-by-slot configuration around your port plan and deliver it with the rest of the network.
3–12 · service slots per chassisCLOS · non-blocking cell-switched fabric100GE · boards up to 6×100GE/40GEVSE 2.0 · clustering, 1.6 Tbps stackM+N · power redundancy up to 3+3
Choose your chassis — four sizes on this page
All four chassis share the same board portfolio — interface boards are interchangeable between models, so spares cover the whole family. Size the chassis by service-slot count and growth headroom, not by today's ports alone.
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Lead time · In stock: at your forwarder’s China warehouse 3 days after payment · Not in stock: 7–15 working days · Then air 5–10 days / sea 25–45 days to your port
Terms · Sample orders welcome · Quotation / PI fixes models, prices, Incoterms (EXW or FOB, each quoted separately), lead time and T/T payment · Defective units: free spare units agreed per order (quantity depends on order size) and written into the quotation · Warranty: up to 5 years on Zhongxin Shutong industrial switches, manufacturer warranty on other brands · Full terms, warranty & RMA
Need the PDF datasheet? Get it on WhatsApp →Corporate orders are registered with the manufacturer under your company name — genuine supply you can verify at the source.
The ZTE Wantong S7850 series is the chassis core of the ZTE Wantong campus family, built for the core and aggregation layers of government, finance, utility, transport, campus, hospital and commercial park networks, as well as campus data centers and new-generation metro networks. The architecture is CLOS non-blocking with cell switching for load balancing, on fully programmable NP chips. All models separate main control from switching fabric, share the same interface boards (48×GE copper/fiber and PoE boards, 8/16/24/48-port 10GE boards, 6-port 40GE and 6-port 100GE/40GE boards), and take M+N power redundancy up to 3+3. VSE 2.0 clustering stacks chassis up to 80 km apart with 1.6 Tbps of stacking bandwidth and zero-perception switchover. This page lists the current four-chassis lineup — S7850-3, S7850-4, S7850-8 and S7850-12 — with figures quoted from the manufacturer's February 2026 datasheet only.
Four chassis, one board portfolio
Interface boards are interchangeable across all four — grow the chassis, keep the boards.
S7850-3 · 4U
Compact core — 3 service slots168 Tbps switching capacity, 36800 Mpps, 5 slots in total (2 MCU), 1+1 power redundancy, single fan module. The entry door into chassis-grade reliability.S7850-4 · 11U
Mid-size core — 4 service slots387/1161 Tbps, 115200 Mpps, 8 slots (2 MCU + 2 fabric), 2+2 power redundancy, dual fan modules — for parks that outgrow a fixed-box core.S7850-8 · 16U
Large core — 8 service slots645/1935 Tbps, 230400 Mpps, 14 slots (2 MCU + 4 fabric), 3+3 power redundancy, 4 fan modules — the workhorse size for full campus cores.S7850-12 · 20U
Flagship — 12 service slots1290/3870 Tbps, 460800 Mpps, 18 slots (2 MCU + 4 fabric), 3+3 power redundancy, 5 fan modules — for metro-scale and dense campus data center cores.Is a chassis core what you actually need?
Plain-language guide — based only on what this series actually does.
Park & institution network coresGovernment, finance, utility, transport, campus, hospital and commercial parks — redundant MCUs, fabric and PSUs keep the core up through single failures.
Campus data centersEVPN VxLAN overlay, BGP-EVPN, VxLAN OAM and Telemetry make the same chassis serve as a small data center spine.
Metro / carrier aggregationMPLS L3VPN, VPLS/VPWS, 6PE and full IPv6 routing suit new-generation metro network build-outs — the series' second design target.
Not the right pick if you need…
- A 1U aggregation box with 10G uplinks — the ZTE Wantong S5860-E series is the lighter, cheaper answer
- Access-layer ports for desks, cameras and APs — that's the ZTE Wantong S5150 series
- Substation or roadside cabinets — our IEC 61850-3 industrial rack switches are built for those racks
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Key Features
The series capability list — from the manufacturer's datasheet.
CLOS non-blocking architecture with cell switching for fabric load balancing; fully programmable NP chips
Control/forwarding separation, redundant hot-swappable MCUs, fabric boards, PSUs and fans
VSE 2.0 clustering: stacking over 80 km, up to 1.6 Tbps stack bandwidth, zero-perception switchover, enhanced MAD
MPLS L2/L3 services: LDP, VPLS, VPWS, H-VPLS, MPLS L3VPN, multicast VPN, MCE
Data center features: VxLAN, BGP-EVPN, VxLAN OAM/ping/tracert
SDN & automation: NETCONF and YANG models, zero-touch deployment, policy follow-on via controller
Visibility & diagnostics: IPFIX and Telemetry sampling, sFlow, optical-module diagnostics, batch inspection tools
Green design: direct airflow duct, dynamic fan speed, EEE, 240 V/336 V HVDC supply, RoHS / WEEE / ISO14001
Who uses it, where it goes and how to plan the network core
Written for the ZTE Wantong S7850 modular core series from its own specifications: 4 CLOS chassis from 4U to 20U with 3 to 12 service slots, boards from 48×GE to 6×100GE, redundant MCUs and up to 3+3 power, VSE 2.0 clustering up to 80 km.
Who it is for
- Enterprise, finance and hospital IT — The core of a network that must stay up through a single failure: two MCUs, separate fabric boards (S7850-4/8/12), hot-swap PSUs and fans, plus NSF/GR so routing keeps forwarding while a main control unit switches over.
- Government, campus and transport projects — Core for parks, universities and transport hubs that collect many aggregation switches such as the S5860-E over 10G or 40G; VSE 2.0 can join two chassis in two machine rooms up to 80 km apart into one logical core.
- ISPs and metro network operators — MPLS L3VPN, VPLS, VPWS and H-VPLS, BGP with 6PE for IPv6, 802.1ag/802.3ah/Y.1731 OAM, and −48 V DC or 240/380 V HVDC inputs for telecom rooms.
- City-scale CCTV backbone integrators — Terminate hundreds of 10G links from district aggregation switches (a 48-port 10GE board per slot), connect storage and video platforms at 40G or 100G, and route multicast video with PIM-SM/SSM and IGMP instead of flooding it.
Where and how to install
- Machine room and rack space — Install in the main machine room in a 19-inch rack: 4U (S7850-3), 11U, 16U or 20U (S7850-12), all about 504 mm deep before boards, cables and optics. Leave room in front for fibre bending and patch panels, mount the chassis low in the rack, and use support rails or a tray rather than the front ears alone.
- A and B power feeds — Split the PSUs of the 1+1, 2+2 or 3+3 set across two independent feeds (A and B), each on its own UPS or DC plant, so losing one feed leaves a full set running. Inputs are −48/−60 V DC (−38 to −72 V), 110/220 V AC (90–290 V) or 240/380 V HVDC (192–400 V).
- Cooling — Long-term operating range is 0°C to +45°C (short-term -5°C to +50°C), so the core belongs in an air-conditioned room, not a closet. The chassis uses a direct airflow duct with 1 to 5 fan modules depending on size; keep its intake and exhaust sides open and match them to the room's cold and hot aisles, and fill unused slots with blank panels so air goes through the boards.
- Fibre and board layout — Spread each aggregation switch's two uplinks, and every LACP or MC-LAG bundle, across two different service boards, so one board failure or replacement does not cut a building off. Label every fibre at both ends, use patch panels instead of running trunk fibre straight to the boards, and check the optical-module diagnostics after commissioning.
- Management network — Connect the out-of-band management port to a separate management network, keep the RS232 (RJ45) console on a console server for remote recovery, and use SSH, SNMP, NETCONF/YANG and Telemetry rather than Telnet. Send Syslog, sFlow or IPFIX to your monitoring platform.
S7850 series planning: which of the 4 chassis
All four chassis use the same interface boards, so the choice is about service slots, redundancy and rack space. The port rows show the ceiling if every service slot held the same board type; real designs mix boards (for example 10GE for aggregation links plus 40GE/100GE for storage or a data center), so count slots per board type.
| S7850-3 | S7850-4 | S7850-8 | S7850-12 | |
|---|---|---|---|---|
| Chassis height | 4U | 11U | 16U | 20U |
| Total slots (MCU + fabric + service) | 5 (2 + 0 + 3) | 8 (2 + 2 + 4) | 14 (2 + 4 + 8) | 18 (2 + 4 + 12) |
| Switching capacity | 168 Tbps | 387 / 1161 Tbps | 645 / 1935 Tbps | 1290 / 3870 Tbps |
| Packet forwarding rate | 36800 Mpps | 115200 Mpps | 230400 Mpps | 460800 Mpps |
| Max 10GE ports (48-port 10GE board in every slot) | 144 | 192 | 384 | 576 |
| Max 100GE/40GE ports (6-port board in every slot) | 18 | 24 | 48 | 72 |
| Max GE / PoE ports (48-port board in every slot) | 144 | 192 | 384 | 576 |
| 25G ports | — | — | — | — |
| Power redundancy / fan modules | 1+1 / 1 | 2+2 / 2 | 3+3 / 4 | 3+3 / 5 |
| Typical position | compact core | mid-size core | campus core | metro / campus DC core |
- Pick the S7850-3 for a park core of up to a few dozen aggregation switches: 3 service slots, for example two 24-port 10GE boards for aggregation links and one 6-port 100GE/40GE board, in only 4U.
- Pick the S7850-4 or S7850-8 when the core needs separate fabric boards and 2+2 or 3+3 power; the S7850-8 doubles the service slots to 8 for full campus cores.
- Pick the S7850-12 for metro or campus data center cores: 12 service slots, up to 72 ports of 100GE/40GE, and two of them fit in 40U of a standard 42U rack.
— = not listed on the page. Maximum port counts are arithmetic (service slots × ports per board) and assume every service slot carries that board; MCU and fabric slots do not take interface boards. Boards, PSUs and optics are configured per project.
Full Specifications — Model by Model
Series specifications with one column per model — technical values in English. The highlighted column follows your model selection above.
Chassis Comparison
| Item | S7850-3 | S7850-4 | S7850-8 | S7850-12 |
|---|---|---|---|---|
| Switching capacity | 168 Tbps | 387 / 1161 Tbps | 645 / 1935 Tbps | 1290 / 3870 Tbps |
| Packet forwarding rate | 36800 Mpps | 115200 Mpps | 230400 Mpps | 460800 Mpps |
| Chassis height | 4U | 11U | 16U | 20U |
| Chassis dimensions (W×D×H, mm, excl. mounting ears) | 444×502.5×175 | 442×504×465 | 442×504×709 | 442×504×886.2 |
| Total slots | 5 | 8 | 14 | 18 |
| Main control (MCU) slots | 2 | |||
| Switching fabric slots | / | 2 | 4 | 4 |
| Service slots | 3 | 4 | 8 | 12 |
| Fan modules | 1 | 2 | 4 | 5 |
| Power redundancy | 1+1 | 2+2 | 3+3 | 3+3 |
Power Options — All Chassis
| Item | S7850-3 | S7850-4 | S7850-8 | S7850-12 |
|---|---|---|---|---|
| DC power | Rated −48 V DC / −60 V DC; max range −38 V DC to −72 V DC | |||
| AC power | Rated 110 V AC / 220 V AC, 50/60 Hz; max range 90–290 V AC, 45–66 Hz (at 90–175 V AC input, output derates to 45% of full load) | |||
| High-voltage DC | Rated 240 V DC / 380 V DC; max range 192–400 V DC | |||
Boards & Software — All Chassis
| Item | S7850-3 | S7850-4 | S7850-8 | S7850-12 |
|---|---|---|---|---|
| Interface board types | 48-port GE PoE copper / 24-port GE copper / 48-port GE fiber / 48-port GE copper / 6-port 100GE/40GE fiber / 24-port GE fiber / 48-port 10GE fiber / 6-port 40GE fiber / 16-port 10GE fiber / 8-port 10GE fiber / 24-port 10GE fiber | |||
| L2 features | VLAN, flexible QinQ, VLAN translation, STP/RSTP/MSTP | |||
| L3 features | VRRP, SuperVLAN, DHCP Server/Relay/Snooping, static routing, RIP, OSPF, IS-IS, BGP, policy routing, MCE | |||
| MPLS / MPLS VPN | LDP, VPLS, VPWS, H-VPLS, MPLS L3VPN, multicast VPN | |||
| Multicast | IGMP Snooping/Proxy, IGMP, PIM-DM/SM, PIM-SSM, MSDP | |||
| QoS | 802.1p, IP DSCP and MPLS EXP marking, rewriting and mapping / 8 hardware queues per port / SP, WRR, SP+WRR scheduling / port- and flow-based bandwidth management / tail drop and WRED congestion avoidance | |||
| Security | CPU anti-attack and overload protection, broadcast/multicast/unknown-unicast suppression, STP Root Guard, BPDU guard, uRPF, RIP/OSPF/BGP MD5 authentication, IP Source Guard, DAI, 802.1x / Portal / MAC authentication | |||
| IPv6 | IPv6, ND, DHCPv6, PMTU, MLD Snooping / static routing, RIPng, BGP4+, OSPFv3, IS-ISv6 / manual tunnels, 6to4, 6PE, ISATAP / IPv6 ACL / IPv6-based device management | |||
| Reliability | Redundant MCU, power and fan boards / LACP, MC-LAG, ERPS, VRRP, FRR, NSF, GR, VSE stacking, BFD | |||
| Data center features | VxLAN, BGP-EVPN, VxLAN OAM, VxLAN ping, VxLAN tracert | |||
| SDN | NETCONF and YANG models; automated deployment and policy follow-on | |||
| Device management | RS232 console (RJ45), out-of-band management port, CLI, Telnet, SSH, local & remote (RADIUS/TACACS+) AAA, SNMP, MIB, RMON, Syslog, fast batch inspection tools | |||
| O&M | 802.1ag, 802.3ah, Y.1731, zero-touch deployment, vertical virtualization, sFlow, Telemetry | |||
| Operating environment | Long-term 0°C to +45°C, short-term -5°C to +50°C, humidity 5%–95% | |||
| MTBF / MTTR | > 250000 h / < 30 min | |||
Engineer's note: A chassis core ships as a configured system, not a single box — main control units, fabric boards, service boards, PSUs and optics are all chosen per project. Send us your port counts and redundancy targets and we will draw up the slot-by-slot configuration list free of charge. All figures on this page follow the manufacturer's February 2026 datasheet.
Modular Core Switch FAQ — S7850 Series
What chassis sizes does the S7850 series offer?
Four CLOS non-blocking chassis from 4U up to 20U, spanning 3 to 12 service slots. The compact 4U chassis measures 444 × 502.5 × 175 mm with 5 total slots — 2 main-control (MCU) plus 3 service — 168 Tbps switching capacity, 36,800 Mpps forwarding and 1+1 power redundancy.
Which interface boards can I populate the slots with?
Options include 48-port GE PoE copper, 48-port GE copper, 24-port GE copper, 48-port GE fiber and 6-port 100GE/40GE fiber boards. Boards are interchangeable across all four chassis, so you can grow into a larger chassis later and keep the boards you already own.
What power inputs and redundancy does it support?
Three feed types: DC rated -48/-60V (range -38 to -72V), AC rated 110/220V at 50/60 Hz (range 90–290V; below 175V output derates to 45%), and high-voltage DC rated 240/380V (range 192–400V). Redundant MCU, power and fan boards are supported, with M+N power redundancy up to 3+3 across the series.
Is it ready for data-center fabrics?
Yes — data-center features include VxLAN with BGP-EVPN control plane plus VxLAN OAM, ping and tracert for troubleshooting overlays. VSE 2.0 clustering, NETCONF/YANG-based SDN automation, zero-touch deployment, sFlow and Telemetry support modern fabric operations alongside classic MPLS L3VPN and VPLS.
How reliable is it as a network core?
Redundant MCU, power and fan boards remove single points of failure, backed by LACP, MC-LAG, ERPS, VRRP, FRR, NSF, GR, VSE stacking and BFD. MTBF exceeds 250,000 hours with MTTR under 30 minutes, operating long-term at 0 to +45°C (short-term -5 to +50°C) and 5–95% humidity.
How do I get a configured quote for my project?
The S7850 is configured slot by slot for each project: chassis size, interface boards, power type and redundancy level. Corporate buyers can place the order with the manufacturer under their own company name, and for small and mid-size orders we deliver to your forwarder's warehouse in China on EXW or FOB terms.
Which S7850 chassis do I need for 30 S5860-E aggregation switches?
Count links, then slots. If each S5860-E sends one 10G uplink to each of two core chassis, every chassis needs 30 10GE ports: two 24-port 10GE boards give 48 ports (18 spare) and let you split the links across boards. That uses 2 of the 3 service slots of an S7850-3, leaving one slot for a 6-port 100GE/40GE board toward servers or storage. Choose the S7850-4 or S7850-8 instead if you want separate fabric boards, 2+2 or 3+3 power, or free slots for growth.
Should two S7850 chassis run as one VSE 2.0 cluster or as an MC-LAG pair?
Both are listed. VSE 2.0 turns the two chassis into one logical core with one configuration, up to 1.6 Tbps of stacking bandwidth, zero-perception switchover and enhanced MAD against split-brain, and the chassis can be up to 80 km apart, which suits two machine rooms on one campus or city. MC-LAG keeps two independently managed chassis, which some operators prefer so that software upgrades touch one core at a time. The page does not say which boards or ports carry the VSE links, so send us the design and we will configure the slots.
Can I run the S7850 on 110–127 V AC mains?
It will run, but plan carefully: the AC range is 90–290 V, and between 90 and 175 V AC each power supply's output derates to 45% of full load. On 110–127 V a full set of PSUs therefore gives less than half of its 220 V capacity, which may not cover a fully populated chassis. Where only 110–127 V is available, use a 208–240 V circuit (common in commercial buildings), −48 V DC from a rectifier plant, or 240/380 V HVDC, and send us your board list so we can check the power budget.
Will the S7850 interoperate with a Huawei, H3C or Cisco core or aggregation layer?
Yes, over standard protocols: 802.1Q VLANs, LACP, STP/RSTP/MSTP, ERPS, VRRP, BFD, OSPF, IS-IS and BGP with MD5 authentication, MPLS LDP, L3VPN and VPLS, VxLAN with BGP-EVPN, PIM multicast, 802.1x/RADIUS/TACACS+, SNMP, Syslog, sFlow and NETCONF/YANG are all listed. VSE clustering and SuperVLAN work only within ZTE Wantong equipment, so between brands use LACP or MC-LAG toward a ZTE Wantong pair and plain VLAN interfaces. Configuration is done in its own CLI, so rebuild configs rather than pasting Cisco or Huawei commands, and run a short interoperability test on the first link.
Which optical modules do the S7850 boards take, and are third-party optics supported?
Each fibre board needs modules for its speed: GE fibre boards take 1G optics, the 8/16/24/48-port 10GE boards take 10G optics, and the 6-port 40GE and 100GE/40GE boards take 40G or 100G optics. Optics are not part of the chassis and are chosen per project, and the page does not publish a third-party compatibility list, so tell us each link's speed, fibre type and distance and we will match the modules. Optical-module diagnostics are listed, so you can read module status after installation.
When is an S7850 worth it instead of using a pair of S5860-E switches as the core?
When you outgrow 10G or need chassis-level redundancy. An S5860-E has at most 12 10G ports (4 fixed plus an 8-port card) or 2×40GE, and no 100G, while even the smallest S7850-3 takes three boards, for example up to 144 10GE ports or 18 ports of 100GE/40GE. The S7850 also has two MCUs, hot-swap boards, PSUs and fans, NSF/GR and MPLS VPLS/VPWS. For a mid-size park with a few hundred access ports and only 10G links, a VSE or MC-LAG pair of S5860-E is often enough.
Ordering questions — samples, shipping, payment, lead time and genuine stock — are answered once on our FAQ page.
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