Cisco STACK-T1-3M 3m StackWise-480/1T Cable Catalyst 3850 C9300 C9300X Refresh

The Cisco STACK-T1-3M (Cisco P/N 800-40405-01) is the genuine 3-meter stacking cable that Cisco supports for both StackWise-480 and StackWise-1T on the Catalyst C9300 and C9300X switches, and for StackWise-480 on the Catalyst 3850 Series. It creates a high-performance back-panel stack with a single control plane, delivering unified management, rapid convergence, and scalable bandwidth for campus access deployments.

At 3m / 9.84 ft, this cable is long enough to bridge multiple racks or span a large wiring closet where 0.5m and 1m cables fall short. A genuine Cisco Refresh OEM part — ideal for enterprise campus access, branch networks, wiring closets, IT labs, and homelab stack builds.

Cisco STACK-T1-3M - Key Features & Benefits

• Supports StackWise-480 and StackWise-1T: Per the Cisco Catalyst 9300 Hardware Installation Guide, STACK-T1 is the cable family for both architectures. StackWise-1T speeds are only achieved in a homogeneous C9300X-only stack; mixed C9300 + C9300X stacks operate at StackWise-480. On Catalyst 3850, the cable runs StackWise-480.
• Stack Up to 8 Switches: Build a single logical switch from up to 8 stack members on Catalyst C9300 / C9300X (and on supported Catalyst 3850 stacks), delivering unified management, shared control plane, and seamless configuration across the stack
• 3-Meter Length (9.84 ft): Long enough to span multi-rack deployments and large wiring closets; minimum bend radius 3.2 in (82 mm) per Cisco hardware installation guide
• Resilient Ring Topology with Hot-Swap Support: Cisco StackWise uses a dual counter-rotating ring for cable redundancy. When the stack is cabled in a full ring, an individual cable can be replaced without powering down the stack; traffic reroutes around the removed cable while the ring is open
• Genuine Cisco Refresh OEM Part: Authentic Cisco MPN STACK-T1-3M / P/N 800-40405-01 — remanufactured to Cisco quality standards with halogen-free construction and secure locking connectors

Cisco STACK-T1-3M - Technical Specifications

• Manufacturer: Cisco
• Part Number: STACK-T1-3M / STACK-T1-3M= • Cisco P/N 800-40405-01
• Product Type: StackWise stacking cable (informally known as “Type 1”)
• Stack Architecture: StackWise-480 (C9300, C9300X, Catalyst 3850) • StackWise-1T (C9300X-only stacks)
• Cable Length: 3 meters / 9.84 ft
• Minimum Bend Radius: 3.2 in / 82 mm
• Minimum Coiled Diameter: 7.17 in / 182 mm
• Compatible Switches: Cisco Catalyst C9300 • C9300X • Catalyst 3850 Series
• NOT Compatible: Catalyst C9300L / C9300LM (use STACK-T3 / STACK-T3A for StackWise-320) • Catalyst 3650 • Catalyst 9200 / 9200L • Cross-family stacking between C9300 and 3850 is not supported
• Maximum Stack Members: 8 switches per stack
• Cable Construction: Halogen-free
• Color: Black
• Condition: Cisco Refresh

Cisco STACK-T1-3M - Frequently Asked Questions (FAQ)

• Which Cisco switches is the STACK-T1-3M compatible with?
  The STACK-T1-3M is the Cisco-supported stacking cable for Catalyst C9300, C9300X, and Catalyst 3850 Series switches. It is NOT compatible with C9300L / C9300LM (those use StackWise-320 with STACK-T3 / STACK-T3A cables), and it is not used on Catalyst 3650, 9200, or 9200L. You also cannot stack C9300 with 3850, or C9300 with C9300L — they are separate stacking families.
• Does this cable give me StackWise-1T performance on my C9300X?
  Only if every switch in your stack is a C9300X. Per Cisco’s 9300 Series FAQ, StackWise-1T is supported only in C9300X-only stacks. A mixed C9300 + C9300X stack using STACK-T1 cables will run at StackWise-480 speeds — the stack composition determines the achievable bandwidth, not the cable alone.
• What’s the difference between STACK-T1 and STACK-T3 / T3A?
  STACK-T1 cables are for C9300 / C9300X / Catalyst 3850 (StackWise-480 and StackWise-1T). STACK-T3 and STACK-T3A cables are used with the C9300L-STACK-KIT adapter on C9300L and C9300LM (StackWise-320). Always match the cable family to your specific switch model — wrong cable will not establish a stack.
• Is this cable hot-swappable?
  Yes, when the stack is cabled in a full redundant ring. Cisco StackWise uses dual counter-rotating rings, so removing one cable breaks the ring but traffic continues across the remaining path. Always verify stack state before removal: hot-swap is safe with ring redundancy intact; on a daisy-chain or already-degraded stack, removing a cable will split the stack.
• Is this a genuine Cisco cable?
  Yes. This is a Genuine Cisco Refresh part bearing Cisco MPN STACK-T1-3M and Cisco P/N 800-40405-01 — remanufactured to Cisco’s quality standards, not a third-party or aftermarket cable.

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