Model Name



Part number



Hardware Load Module Specifications

Slot / number of ports


  • 12x40GE ports


  • 6x40GE ports

Physical interfaces

QSFP 12x40GE (native)

QSFP 6x40GE (native)

Chassis Capacity: Maximum Number of Cards and Ports per Chassis Model

XGS12-SD chassis[1]


10 load modules:

  • 120-ports of 40GE

10 load modules:

  • 60-ports of 40GE

XGS12-HS chassis[1]


10 load modules:

  • 120-ports of 40GE

10 modules:

  • 60-ports of 40GE

XGS12-HSL chassis[1]


10 load modules:

  • 120-ports of 40GE

10 load modules:

  • 60-ports of 40GE

XGS2-SD chassis


2 load modules:

  • 24-ports of 40GE

2 load modules:

  • 12-ports of 40GE

XGS2-HS chassis


2 load modules:

  • 24-ports of 40GE

2 load modules:

  • 12-ports of 40GE

XGS2-HSL Chassis


2 load modules:

  • 24-ports of 40GE

2 load modules:

  • 12-ports of 40GE

CPU and memory

Multicore processors with 4GB of memory per processor

IEEE interface protocols

  • 40GBASE-SR4 (802.3ba-2010)
  • 40GBASE-LR4 (802.3ba-2010)
  • 40GBASE-CR4 (802.3ba-2010)

Transceiver support


  • 40GBASE-SR4 (multimode 850nm)
  • 40GBASE-LR4 (single mode 1310nm)[2]

Cable media

  • 40GBASE-CR4 QSFP+ DAC passive copper, point-to-point up to 3 meters in length

Operating temperature range

41°F to 95°F (5°C to 35°C), ambient air

0% to 85%, non-condensing

Load module dimensions

16.8” (L) x 1.3” (W) x 12.0” (H)

427mm (L) x 33mm (W) x 305mm (H)

Load module weights

12-port model:

  • Module only: 12.5 lbs. (5.67 kg)
  • Shipping: 16.2 lbs. (7.35 kg)

6-port model:

  • Module only: 9.3 lbs. (4.22 kg)
  • Shipping: 13.1 lbs. (5.94 kg)

Transmit Feature Specifications

Transmit engine

Wire-speed packet generation with timestamps, sequence numbers, data integrity signature, and packet group signatures

Max. streams per port

40GE mode: 32

40GE mode: 32

Max. streams per port in data center Ethernet

40GE mode: 32

40GE mode: 32

Stream controls

Rate and frame size change on the fly, sequential and advanced stream scheduler

Minimum frame size


  • 64 bytes (line rate)
  • 49 bytes (< line rate)

Maximum frame size

14,000 bytes

14,000 bytes

Maximum fame size in data center Ethernet

9,216 bytes

9,216 bytes

Priority flow control

8 line-rate-capable queues with each supporting up to 2,500 byte frame lengths

1 queue supporting up to 9,216 byte frame length

Frame length controls

Fixed, increment by user-defined step, weighted pairs, uniform, repeatable random, IMIX, and Quad Gaussian

User defined fields (UDF):

Fixed, increment or decrement by user-defined step, sequence, value list, and random configurations. Up to ten, 32-bit wide UDFs are available.

  • Value lists (max.)

40GE: 1 million / UDF

  • Sequence (max.)

40GE: 128K / UDF

Error generation

Generate good CRC or force bad CRC, undersize and oversize standard Ethernet frame lengths, and bad checksum

Hardware checksum generation

Checksum generation and verification for IPv4, IP over IP, IGMP/GRE/TCP/UDP, L2TP, GTP

Link fault signaling

Reports, no fault, remote fault, and local fault port statistics

Latency measurement resolution

40GE: 2.5 nanoseconds

Intrinsic latency compensation

Removes inherent latency error from the port electronics

Transmit line clock adjustment

Ability to adjust the parts per million line frequency over a range of -100 ppm to +100 ppm per resource group

Receive Feature Specifications

Receive engine

Wire-speed packet filtering, capturing, real-time latency and inter-arrival time for each packet group, with data integrity, sequence, and advanced sequence checking capability

Trackable receive flows per port

40GE: 128K

Minimum frame size

64 bytes at line rate

≥ 49 bytes not a line rate

Filters (user-defined statistics, UDS)

2 SA/DA pattern matchers, 2x16-byte user-definable patterns with offsets capability for start of: frame, IP, or protocol; Up to 6 UDS counters are available

Hardware capture buffer per port or resource group

40GE: 2GB per 1, user-selected port/resource group

Statistics and rates

Link state, line speed, frames sent, valid frames received, bytes sent/received, fragments, undersize, oversize, CRC errors, VLAN tagged frames, 6 user-defined stats, capture trigger (UDS 3), capture filter (UDS 4), 8 QoS counters, data integrity frames, data integrity errors, sequence and advanced sequence checking frames, sequence checking errors, ARP, and PING requests and replies

PCS lanes port statistics (40GbE mode only)

PCS Sync Errors, Illegal Codes, Remote Faults, Local Faults, Illegal Ordered Set, Illegal Idle, Illegal SOF, Out Of Order SOF, Out Of Order EOF, Out Of Order Data, Out Of Order Ordered Set

Latency/jitter measurements

Cut-through, store & forward, forwarding delay, up to 16 time bins latency/jitter, MEF jitter, and inter-arrival time

Layer 2-3 Protocol Support

L2/3 routing, bridging, and timing


Routing: RIP, RIPng, OSPFv2/v3, ISISv4/v6, EIGRP, EIGRPv6, BGP/BGP+


MPLS VPN: L2VPN PW, L3VPN/6VPE, 6PE , VPLS-LDP, VPLS-BGP, VPLS-BGP AD and LDP FEC 129, Inter-AS VPN Option A, B, and C, Seamless MPLS, Carrier Supporting Carrier (CsC), GRE mVPN, NG mVPN (mLDP and RSVP-TE P2MP), EVPN/PBB-EVPN

High-Availability: BFD, Graceful Restart, MPLS Ping/TraceRoute, LSP BFD, VCCV BFD, Real-time dynamic label swap for convergence time measurement up to millisecond accuracy

IP Multicast: IGMPv1/v2/v3, MLDv1/v2, PIM-SM/SSM, PIM-BSR, multicast VPN

Switching: STP/RSTP, MSTP, PVST+/RPVST+, LACP, LLDP, Protocols over LACP Bundle

Carrier Ethernet: Link OAM, CFM, Service OAM, PBT/PBB-TE, SyncE, PTP (1588v2), E-LMI

Data center Ethernet

Priority Class-Based Flow Control (IEEE802.1Qbb), FCoE/ FIP, LLDP/DCBX, VNTAG/VIC, OpenFlow, FabricPath, TRILL, SPBM, VEPA, VXLAN

Broadband access

Broadband: ANCP, PPPoX, DHCPv4 client/server, DHCPv6 client/server, L2TPv2, Radius Attributes for L2TP, Dual-Stack PPPoX, AMT

Authentication: 802.1x, WebAuth, Cisco NAC


Application Support

Xcellon-Multis Load Modules

  • IxNetwork: Provides wire-rate traffic generation with service modeling that builds realistic, dynamically-controllable data-plane traffic. IxNetwork offers the industry's best test solution for functional and performance testing by using comprehensive emulation for routing, switching, MPLS, IP multicast, broadband, authentication, Carrier Ethernet, and data center Ethernet protocols.
  • IxExplorer: Layer 2-3 wire-speed traffic generation and analysis.
  • Tcl API: Custom user script development for layer 1-3 testing.

[1] The Xcellon-Multis load modules may not be placed into slots 1 and 12 of the XGS12-HS, XGS12-SD, and XGS12-HSL chassis. Please consult your factory sales representative for further information.

[2] Due to increased power consumption of single-mode fiber QSFP-LR4 (40GBASE-LR4) optical transceivers, a maximum of three may be installed in a load module at one time. Active ports for the XMR40GE12QSFP+ (944-1114) are ports 10, 11, and 12. Active ports for the XMR40GE6QSFP+ (944-1115) are ports 4, 5, and 6. For both models, the remaining ports may still have 40GBASE-SR4 transceivers installed while the three each 40GBASE-LR4 transceivers are also installed at the same time

Key Features
  • Less cabling, power, cooling, total cost of ownership, rack space, licensing
  • More ports, bandwidth, flexibility, capability, horsepower
  • Reduces total cost of ownership with more ports in a single chassis; 120x40GbE ports with fan-out-enabled technology
  • A broad feature-set that is common with Xcellon-Multis Reduced 10GbE and 10/40GbE load modules
  • Low-to-mid-range L2-3 protocol scale and performance testing for routing/switching and data center test cases

Introducing the Evolution of Xcellon HSE Testing

As bandwidth requirements press the limits of networking devices, equipment manufacturers must keep pace by introducing even higher-density 10GbE and 40GbE gear. Xcellon-Multis is Ixia’s next-generation architecture and test solution to satisfy a wide range of testing needs. As service providers and large enterprises implement this same equipment in their own networks, they must also test and verify performance and functionality prior to deployment.

Ixia’s Xcellon-Multis load module family comprises the industry’s highest-density 10GbE and 40GbE higher speed Ethernet (HSE) test equipment, providing more flexible test coverage for high-density test requirements. These ultra-dense load modules bring a higher return on investment by reducing overall costs associated with product licensing, space, power, and cooling.

The Xcellon-Multis Reduced 40GbE load modules offer industry-leading high-density, cost-effective, and flexible 40GbE capability for testing next-generation multi-terabit networks. Used in conjunction with Ixia applications, the user can quickly and accurately assess the performance and reliability of network equipment and solutions before they are deployed.