Terminator 5 Adapter Range

High Performance, Dual Port 1/10/25GbE OCP 3.0 Unified Wire Adapter

Enables TCP, UDP, iWARP, iSCSI, NVMe/TCP, FCoE, TLS/SSL, DTLS, NGINX, IPsec, SMB 3.X crypto, and SDN Offload over Single Unified Wire with SR-IOV, EVB/VNTag and DCB


Chelsio’s T6225-OCP3 is a dual port 1/10/25Gb Ethernet OCP 3.0 (Open Compute Project) Unified Wire Adapter, with a PCI Express 3.0 x8 host bus interface, optimized for storage, cloud computing, HPC, virtualization, security, and other datacenter applications in an Open Compute environment. OCP NIC 3.0 specification allows users to utilize compact server designs that can accommodate high-performance adapters with advanced hardware acceleration capabilities.

T6225-OCP3 provides sub micro-second end-to-end latency, while offloading the host CPU from a variety of typical storage, network, security, and cloud related protocols. This will enable savings in host CPU acquisition costs, power and operational costs, and dramatically increases system performance. A large portion of offloads enabled by T6225-OCP3 are based on standard TCP, IP, UDP protocols (such as iSCSI, NVMe/TCP, and iWARP), and thus can operate with a software peer, providing the requisite reliability for enterprise customers, and allowing incremental installs in the datacenter. The Ethernet-only networking reduces the infrastructure costs in network adapters, cables, switches, rack space, power, equipment spares, management tools, planning, networking staff, and installation.

T6225-OCP3 supports IEEE standards-based link aggregation/failover features, as well as inter-adapter failover techniques that make it ideal for critical network applications requiring redundancy and high-availability capabilities. It also includes an integrated Traffic Manager for robust and flexible flow control, traffic management and QoS, DCB, PFC, ETC, etc.

FCoE and iSCSI support in T6225-OCP3 benefit from high reliability features that include memory ECC, data path CRC, and T10-DIX offload, in addition to the checksums and CRC available at different protocol layers. High-performance iSCSI and FCoE provide a drop-in replacement upgrade from legacy SANs to converged networks.

T6225-OCP3 runs all the host software of its predecessor, T5, as-is, thus enabling leveraging of all prior software investments. It offers all the features of T5, and in addition adds support for integrated offload of IPsec, TLS/SSL, DTLS, and SMB 3.X crypto. The Converged Network Adapters (CNA) don’t have any external memory on them and can offload 256 connections of TOE, iSCSI, iWARP, and NVMe/TCP.


The Unified Wire Solution

T6225-OCP3 enables a unified wire for LAN, SAN, and cluster applications, with a complete set of storage and cluster protocols operating over Ethernet (iSCSI, NVMe-oF, NVMe/TCP, FCoE, and iWARP). A unified wire means having the ability to utilize all offload or non-offload protocols at the same time, over the same link, using the exact same firmware, host software, and adapter. Thus, a given system using T6225-OCP3 can be easily targeted at different vertical markets and a variety of useful functions enabled (i.e. dial the bandwidth to a given application and assign access control, while offloading only part of the traffic).


Sixth-Generation Protocol Offload Engine

T6 is Chelsio’s sixth-generation TCP offload (TOE) design, fifth-generation iSCSI design, and fourth-generation iWARP (RDMA) implementation. With support for the 8 Gbps PCIe Gen3 data rate, it provides 128Gbps of raw bandwidth. Also provides support for PCIe SR-IOV virtualization with an embedded virtual switch.


Complete and Flexible TCP Offload

The T6225-OCP3 transport engine executes programmable firmware and is configurable with hundreds of registers for protocol parameters, RFC compliance, and offload control. It can offload protocol processing per connection, per-server, per-interface, while simultaneously providing complete stateless offload for non-offloaded connections (processed by operating systems stack running on the host CPU). It also provides a flexible direct data placement capability for regular TCP sockets, with all the benefits of zero-copy and kernel bypass without rewriting the applications.


High-Performance Security Offload

T6225-OCP3 introduces ground breaking TLS/SSL performance with inline cryptographic functions leveraging Chelsio’s proprietary TCP/IP offload engine. Chelsio’s Inline TLS/SSL offload is uniquely capable of 100Gbps line-rate performance. In addition, it can be used with inline mode for IPsec and DTLS and in a traditional co-processor lookaside mode to accelerate IPsec, TLS/SSL with AES, SHA1 and SHA2 processing, and SMB 3.X crypto.


Packet Switching and Routing

T6225-OCP3 integrates a 264-port high-performance L2-L3 packet switch with integrated access control and flow control support, which allows switching traffic from any of the ports or host queues or physical or virtual functions to each other. The switch can further provide multicast and replication functions in ingress or egress direction. Typical use is for very high-performance OVS offload.


Robust, Proven Solution

Subjected to thousands of hours of compatibility testing, over a decade of stress testing by several OEM test suites, and production deployment in servers, storage systems, and cluster computing, Chelsio’s robust, stable protocol offload technology delivers proven performance in wide range of environments.


Software Drivers

Chelsio offers a full suite of protocol software drivers with the T6225-OCP3 adapters. See Support Page for the latest information.


Ordering Information

Model: T6225-OCP3
Physical Interface: 25GBASE-SR/LR*
Connector: SFP28
Media: MMF or SMF or Twinax



SM10G-SR/LR: 10G short/long reach SFP optical module
SM25G-SR/LR: 25G short/long reach SFP28 optical module
TAPCABLE-3M: Twinax/DAC passive cable for 10Gb, 3M
TAPCABLE28-3M: Twinax/DAC passive cable for 25Gb, 3M
SRCABLE3M/LRCABLE3M: Short/Long reach Fiber Optic cable for 10Gb and 25Gb, 3M 

* QSFP28 optics sold separately. Only Chelsio-supplied modules may be used.