Arista Networks CAB-Q-S-0.5M Compatible 40G QSFP+ to 4 x 10G SFP+ Passive Copper Breakout Cable, 0.5m (2ft)
This page gives procurement and network teams a precise reference for Arista Networks CAB-Q-S-0.5M: a 40G DAC assembly in a fixed 0.5m (2ft) configuration. The QSFP+ to 4 SFP+ interface, HT ordering identity and verified specifications are presented together so the required cable can be matched to the bill of materials without confusing it with another length.
OEM Part Number: CAB-Q-S-0.5MHT Part Number: CAB-Q-S-0.5M
Product Highlights
- Compatible alternative to Arista Networks CAB-Q-S-0.5M
- 40G connectivity at 40Gbps
- Interface configuration: QSFP+ to 4 SFP+
- Fixed length and part number: 0.5m (2ft), CAB-Q-S-0.5M
- Conductor specification: 30AWG
- Minimum bend radius: 21mm
Specifications
| HT Part Number | CAB-Q-S-0.5M |
|---|---|
| Arista Networks Compatible | CAB-Q-S-0.5M |
| Manufacturer | HT |
| Connector Type | QSFP+ to 4 SFP+ |
| Max Data Rate | 40Gbps |
| Minimum Bend Radius | 21mm |
| Wire AWG | 30AWG |
| Cable Length | 0.5m (1.64ft) |
| Jacket Material | PVC (OFNR) |
| Temperature | 0 to 70°C (32 to 158°F) |
| Protocols | SFF-8436, SFF-8431 and QSFP+ MSA |
Cable Construction and Routing
This assembly uses 30AWG conductors, PVC (OFNR) jacket, minimum bend radius 21mm. These mechanical characteristics affect how the cable should be dressed behind the equipment. Avoid sharp edges, excessive ties and repeated tight bends close to the connector boots.
Position Within the Length Range
CAB-Q-S-0.5M is the shortest of 7 verified length options in this family. It is the preferred choice when the port positions are close and cable slack must be kept to a minimum. The next option is CAB-Q-S-1M at 1m (3ft), adding 0.5m for a less direct routing path; selecting it unnecessarily would leave more cable to dress.
Procurement and Port-Mapping Review
A useful purchase order should identify the host platform, the expected OEM code and the exact cable length as separate pieces of information. This prevents a physically similar assembly from being substituted when the port identification or reach is different. For mixed-length installations, prepare one order line per part number and reconcile each delivered cable with its intended pair of ports. For this assembly, the listed conductor specification is 30AWG; the minimum bend radius is 21mm; the jacket material is PVC (OFNR).
Network and Protocol Considerations
The intended application is determined by the host interface and protocol support. Listed interface and protocol references include SFF-8436, SFF-8431 and QSFP+ MSA. Confirm that the host firmware and port configuration support the same operating mode.
Breakout Port Mapping
The QSFP+ to 4 SFP+ configuration divides the high-speed interface into multiple lower-speed connections. Verify the upstream lane assignment, downstream port speeds and breakout setting on the host before connecting the assembly. Each branch must attach to the correct remote interface.
Passive Copper Operation
A passive DAC has no separate optical conversion stage. Its low-power, low-latency operation is useful for short equipment links, but the assembly must remain within the length and signaling mode accepted by both hosts.
Length Selection and Installation Planning
The 0.5m (2ft) length is suited to closely aligned ports where excessive slack would obstruct airflow or complicate dressing. Measure the actual port-to-port path before choosing CAB-Q-S-0.5M; even a short assembly must retain the specified bend radius and should never be pulled tight behind the equipment.
Arista Networks Compatibility and Factory Testing
Our procurement-oriented compatibility check begins with the OEM reference and ends with a live host link. We record the physical length separately from the identification configuration, so the cable supplied for this page remains the stated version rather than a generic length substitute. The check includes link stability and diagnostic indications, followed by a final inspection of both ends.
Ordering Information
For a clear bill of materials, quote the OEM reference, HT part number, length and quantity on the same line. Add the switch or server model and software release when a pre-order review is required; project labels can repeat those details for receiving and installation teams. Keep CAB-Q-S-0.5M associated with 0.5m (2ft) throughout the order and receiving record.
Quality Assurance and Packaging
Before packing, the assembly is checked for connector condition, identification and link operation. Cables for multi-line orders can be labelled and grouped by part number, making it easier to match each length to the procurement record without opening every protective bag. Standard protective packing is used by default, with project documentation arranged when requested.
Frequently Asked Questions
Is this an original Arista Networks cable?
No. It is an HT-manufactured compatible alternative for equipment that specifies Arista Networks CAB-Q-S-0.5M.
Can excess cable be folded into a compact bundle?
No. Use a supported, bend-safe service loop and observe the listed minimum bend radius. Do not crease the cable or tighten ties around the connector boots.
Will any matching connector operate at the same speed?
Not necessarily. Both hosts must support the stated rate, identification, lane mapping and any required breakout configuration; mechanical compatibility alone is insufficient.
What details assist a compatibility review?
Provide the equipment manufacturer, model, port type, hardware revision and software release, together with the OEM reference, required length and quantity.
Shipping and Lead Time
Standard configurations normally ship within one to three working days, while production quantities are confirmed with the order. Delivery can be arranged by courier, air freight or sea freight, and goods may instead be handed to an appointed forwarder or shipped on the customer’s courier account.