ZXWT S7850-3 4U compact core switch chassis

ZXWT S7850-12 20U flagship core switch chassis

ZXWTS7850 Series · Campus Core

Modular Core Switches · 4 Chassis Sizes · CLOS Architecture

ZXWT S7850 · Core Switches

Name: ZXWT S7850 Series Modular Core Switches (S7850-3 / S7850-4 / S7850-8 / S7850-12)
Brand: ZXWT

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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In-stock models: 3 days to your designated warehouse after payment · Out-of-stock or insufficient stock: 7–15 working days

Sample quantities are welcome — testing one or two units first is the normal way to start.

Corporate orders are registered with the manufacturer under your company name — genuine supply you can verify at the source.

4chassis sizes — 4U to 20U

12service slots on the S7850-12

80kmVSE 2.0 stacking distance

3+3max power redundancy

The ZXWT S7850 series is the chassis core of the ZXWT 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 ZXWT S5860-E series is the lighter, cheaper answer
Access-layer ports for desks, cameras and APs — that's the ZXWT S5150 series
Substation or roadside cabinets — our IEC 61850-3 industrial rack switches are built for those racks

Worried about the source? Order under your own company name.

For corporate buyers: we support submitting the purchase order to the manufacturer under your company's real name — your company appears on the official order, so the origin of the goods can be verified directly with the factory. Just provide your company name and pay by corporate bank transfer.

1 · Company name2 · Corporate bank payment3 · Order registered in your name

Using your own freight forwarder? No problem.

For small and mid-size orders, we deliver directly to your designated forwarder's warehouse in China (EXW / FOB Guangzhou). From hand-over onward, international shipping and destination-side arrangements are handled by your forwarder — the way you already work.

EXW / FOB GuangzhouDelivery to your forwarder's warehouseNo minimum order

Note: manufacturer order registration (left) is available via the corporate purchase channel.

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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

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

	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

	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

	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.