CE5855-48T4S2Q-EI-B: 48-Port 10G SFP+ Data Center Ethernet Switch with 40G QSFP+ Uplinks
The CE5855-48T4S2Q-EI-B is a 1U, high-density 10G SFP+ Ethernet switch built for server access and spine-leaf fabrics inside modern data centres. Forty-eight line-rate 10GE SFP+ front-panel ports plus four 40GE QSFP+ uplink ports deliver a non-blocking design that keeps east-west traffic flat while leaving headroom for aggregation.
Every unit we ship is rack-tested before dispatch: ports are verified individually against optics, the uplink modules are looped back, and fan and power modules are run under load so that what you install matches the test sheet in the box. This listing is for buyers who need a repeatable, documented hardware source for 10G SFP+ switch rollouts, not a one-off marketplace transaction.
Hardware Overview and Interface Layout
The front panel carries 48 x 10GE SFP+ cages wired for 10G Base-X optics and DAC cables, followed by four 40GE QSFP+ ports reserved for uplinks to a leaf-spine core or for high-bandwidth server groups. Access ports hold line rate in both directions, so a 10G SFP+ server link does not have to share oversubscribed backplane capacity with its neighbours. Rear-side serviceability is straightforward: dual AC power modules and a removable fan tray are hot swappable, and the airflow direction is front-to-back, matching standard data centre hot-aisle and cold-aisle layouts.
Key Technical Parameters
| Item |
Specification |
| Model | CE5855-48T4S2Q-EI-B |
| Port configuration | 48 x 10GE SFP+ (10G Base-X) |
| Uplink ports | 4 x 40GE QSFP+ |
| Switching mode | Non-blocking, line-rate on all ports |
| Forwarding latency | Under 1 microsecond |
| Layer support | Layer 2 and Layer 3 |
| Form factor | 1U, 19-inch rack mountable |
| Dimensions | 442 x 420 x 44.4 mm |
| Power supply | 2 x AC, 1+1 redundancy, hot swappable |
| Input voltage | 100-240 V AC, 50/60 Hz |
| Airflow | Front-to-back, removable fan tray |
| Operating temperature | 0 to 45 C |
| Management | CLI, SNMP, NETCONF, streaming telemetry |
| Weight | Approximately 8.5 kg with power modules |
Why This Platform Fits Your Rack
- 48 x 10G SFP+ in a single unit – one rack unit replaces three legacy 1G access switches, cutting patch-panel density, cabling runs and per-port power cost.
- 4 x 40G QSFP+ uplinks – aggregate to a spine layer without adding a separate aggregation shelf; each QSFP+ port can also break out to four 10G links.
- Sub-microsecond forwarding – latency stays flat regardless of frame size, which is the property distributed storage and HPC clusters actually notice.
- 1+1 power redundancy – dual hot-swap AC modules allow a feed or supply replacement with zero downtime for live traffic.
- Front-to-back airflow – aligns with standard cold-aisle intake, so no ducting or reversed fan tray is needed in retrofit cabinets.
- Automation-ready – NETCONF and telemetry support let infrastructure teams push configuration and stream interface counters into existing monitoring stacks.
Typical Deployment Scenarios
| Scenario |
How the switch is used |
| Server access / ToR | Top-of-rack access for 10G NIC servers, dual-homed to two leaf switches. |
| Spine-leaf fabric | Leaf role with 40G QSFP+ uplinks to the spine, supporting MLAG and ECMP paths. |
| Storage networking | Low-latency iSCSI, NAS and backup traffic where tail latency affects job completion time. |
| Enterprise campus core | Collapsed core for mid-size sites needing 10G aggregation with 40G backhaul. |
| HPC and render farms | Dense 10G fan-out for compute nodes with predictable east-west bandwidth. |
Questions Buyers Ask Before Ordering
Q: How many 10G SFP+ ports does the CE5855-48T4S2Q-EI-B provide, and can the 40G ports also be used for servers?
A: There are 48 x 10GE SFP+ access ports and 4 x 40GE QSFP+ ports. The QSFP+ ports ship configured as uplinks, and each can be broken out into four 10G links when you need extra server-facing capacity.
Q: Is this 10G SFP+ switch suitable for a spine-leaf data center fabric?
A: Yes. The 48-port density and four 40G uplinks are sized for the leaf role, and the platform supports MLAG and ECMP so each server has two independent paths to the spine.
Q: Why does sub-microsecond latency matter for a data center Ethernet switch?
A: In distributed storage and cluster workloads, queueing delay compounds across every hop. Keeping forwarding latency under one microsecond regardless of frame size removes the switch as a variable when you tune application performance.
Q: What power and cooling arrangement does the unit need?
A: Two hot-swappable AC supplies run in 1+1 redundancy on 100-240 V AC, and the removable fan tray pulls air front-to-back, so a single cold-aisle feed and standard cabinet depth are enough.
Q: What is included with each unit and how is it verified?
A: Each switch ships with its power modules, fan tray and rack ears, together with a port-by-port test record and the matching serial number. Units are covered by a 12-month hardware warranty, and our engineers can confirm optic compatibility with your existing 10G SFP+ and 40G QSFP+ inventory before shipment.
Ordering Notes
Tell us the quantity, the optics or DAC cables you plan to pair, and whether the deployment is new-build or refresh. We confirm power module type, airflow direction and firmware level against your rack requirements before dispatch, and we can supply mixed quantities with matching batches for multi-site rollouts. For teams standardising a 40G QSFP+ switch layer across several sites, we keep spare units and modules available for staged cutover windows.
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