Vertiv ACS8032MDAC-400 32-Port Serial Console Server with Dual AC and Analog Modem
Overview
The Vertiv ACS8032MDAC-400 is a rack-mounted serial console server engineered for out-of-band management of large-scale network and data center infrastructure. With 32 RS-232 serial ports, 8 USB 2.0 ports, 4 digital I/O ports, dual AC power supplies, and a built-in analog modem, this unit is purpose-built for environments where maintaining device access during primary network failures is non-negotiable. If you manage rows of routers, switches, servers, or PDUs and need a reliable fallback management path at any hour, the ACS8032MDAC-400 (often searched as ACS8032MDAC 400) belongs on your shortlist.
For data center managers evaluating the broader Vertiv console server lineup, the ACS8032MDAC-400 sits at the high-density end of the ACS8000 series, delivering the port count and redundancy features that smaller models can't match.
Key Features
- 32 RS-232 Serial Ports: Directly connect 32 console-managed devices — routers, switches, OOB PDUs, firewalls — under a single management interface. That's enough headroom for a fully populated half-rack of 1U devices without a secondary console server or daisy-chaining.
- 8 USB 2.0 Ports: Extend connectivity to devices with USB console ports or attach USB storage for local file transfer and firmware staging — eliminating a separate USB hub in your out-of-band management rack.
- 4 Digital I/O Ports: Wire environmental sensors, door contacts, or dry-contact alarm inputs directly to the unit. Consolidated OOB management plus physical environment signaling from one device reduces wiring complexity and management overhead.
- Dual AC Power Supplies (35W max): Both power supplies draw a combined maximum of 35W — modest enough to run on a single 20A circuit with substantial headroom — while delivering full N+1 redundancy. A failed PSU won't interrupt serial console access to any of your 32 connected devices.
- Built-In Analog Modem: When the LAN is down and the WAN is compromised, the internal PSTN modem gives you a last-resort dial-in management path that bypasses your entire IP infrastructure. No external modem shelf, no hunting for a spare modem in a crisis.
- Cellular Fallback via External Router: The unit supports cellular out-of-band access when paired with an external cellular router, giving you a third management path — LAN, PSTN modem, and cellular — for truly mission-critical sites.
- Dual Gigabit Ethernet (10/100/1000BT) + 2 Gigabit Fiber SFP: Two copper GbE ports support network redundancy or dual-homing. The two SFP fiber ports extend reach to IDF closets or cross-campus links without signal degradation — critical in facilities where the console server lives in a central MDF but managed devices are distributed.
- Wide Operating Temperature: 14°F to 140°F (-10°C to 60°C): Handles the thermal range of most wiring closets, data halls, and hardened NOC environments without additional cooling provisions. The storage range extends to -4°F/-20°C, so cold-storage or unheated staging environments won't damage units sitting on a shelf.
- 20%–80% Non-Condensing Humidity Tolerance: Covers standard data center and equipment room HVAC specs. Not rated for outdoor or high-humidity industrial environments — plan accordingly if the install point is near a loading dock or exterior wall.
Integration & Compatibility
The ACS8032MDAC-400 is designed as an out-of-band management hub for heterogeneous environments. RS-232 serial is the universal fallback console interface across virtually every managed network device — Cisco IOS, Juniper JunOS, Arista EOS, HPE, and most Linux-based appliances all expose an RS-232 console port. The eight USB 2.0 ports extend compatibility to newer devices that use USB-A or USB-B console ports, removing the need for USB-to-serial adapters at the device end.
For organizations building a layered OOB management architecture, the ACS8032MDAC-400 pairs naturally with a managed rack PDU — connect PDU serial consoles to free serial ports on this unit to enable remote power cycling without a separate PDU management module. The dual SFP fiber ports make this unit a practical fit for core switching environments where fiber backbones are the norm and copper uplinks are kept as secondary paths only.
Cellular out-of-band connectivity requires an external cellular router connected to one of the GbE uplink ports — the unit does not contain an internal cellular modem. Plan that dependency into your BOM if cellular failover is a site requirement. For a structured approach to console server selection and OOB architecture, review the out-of-band management planning guide before finalizing port count and fallback path requirements.
Frequently Asked Questions
Q: How many devices can I manage simultaneously with the ACS8032MDAC-400?
A: The ACS8032MDAC-400 provides 32 RS-232 serial ports plus 8 USB 2.0 ports, supporting up to 40 console-connected devices depending on device type. Multiple administrators can access different device consoles concurrently over the network management interface.
Q: Does the ACS8032MDAC-400 include cellular failover built in?
A: No. The unit supports cellular out-of-band access via an external cellular router connected to one of its GbE uplink ports. The built-in fallback modem is an analog PSTN modem for dial-in access — cellular connectivity requires a separate router in your BOM.
Q: What is the purpose of the 4 digital I/O ports on the ACS8032MDAC-400?
A: The 4 digital I/O ports accept dry-contact signals from environmental sensors, door contacts, or alarm systems. This allows the unit to serve as a consolidated monitoring point for both device console access and physical environment alerting without requiring a separate environmental monitoring appliance.
Q: What is the power draw of the ACS8032MDAC-400 and does it require dual circuits?
A: Maximum input power is 35W — well within the capacity of a single 20A branch circuit. The dual AC power supplies provide N+1 redundancy; both can be fed from the same circuit or split across two circuits for maximum resilience. No special power provisioning is required beyond a standard 20A outlet per PSU.
Q: Can the fiber SFP ports and copper GbE ports be used simultaneously on the ACS8032MDAC-400?
A: The unit provides 2 Gigabit Fiber SFP ports and 2 Gigabit 10/100/1000BT Ethernet ports as separate network interfaces. Dual-homing configurations — for example, copper to the primary management VLAN and fiber to a secondary OOB network segment — are a common deployment pattern for this unit.
Q: What operating temperature range does the ACS8032MDAC-400 support?
A: The ACS8032MDAC-400 is rated for operation from 14°F to 140°F (-10°C to 60°C), covering standard data center, wiring closet, and most hardened NOC environments. Storage temperature range extends from -4°F to 158°F (-20°C to 70°C).
The detail that stands out most to me on the ACS8032MDAC-400 is the three-path fallback architecture packed into a single 1U unit: primary LAN via dual GbE or fiber SFP, secondary dial-in via the built-in analog modem, and tertiary cellular when you add an external router. I've seen plenty of 32-port console servers, but most require an external modem shelf or a separate cellular appliance to match that failover stack — here it's consolidated from the start.
Technical Highlights:
- 32 RS-232 + 8 USB 2.0 Ports: Forty potential console connections in a single unit — enough to cover a densely populated half-rack without daisy-chaining or a secondary console server, which simplifies both cabling and management.
- Dual AC PSUs at 35W Max: N+1 power redundancy at a power draw modest enough to share a single 20A circuit with other management-plane gear. The draw per PSU is low enough that you won't need to re-evaluate your PDU capacity.
- 2x GbE Copper + 2x GbE Fiber SFP: The SFP ports are the spec integrators often overlook — they make this unit viable as a cross-campus or inter-building OOB management node without needing a media converter in the path.
Deployment Considerations:
- The digital I/O ports accept dry-contact inputs, but you'll need to verify sensor compatibility with Vertiv's ACS8000 configuration guide — not all environmental sensor endpoints produce a dry-contact signal without an intermediate adapter.
- Cellular failover requires an external router connected to a GbE uplink port. Budget that into your rack space and cost estimate early — it's not a surprise cost, but it's one that's easy to miss at quote time.
The ACS8032MDAC-400 is the right call for multi-row data center deployments or large network PoPs where 24 or fewer serial ports won't cover the device inventory and where a single point of failure in the OOB management path is genuinely unacceptable — the dual PSUs and analog modem backstop make it defensible in any post-incident review.
