Black Box LES1716A-R2 Console Server with Integrated POTS Modem

Overview

The Black Box LES1716A-R2 is a console server with an integrated POTS modem, built for out-of-band management of network infrastructure and serial-attached devices. Console servers in this class give network engineers a dedicated fallback path to routers, switches, firewalls, and servers when the primary IP network is unreachable — the integrated analog modem means you can dial in directly over a standard phone line, independent of your data network entirely. That independence is the core value proposition: when your WAN fails or your core switch locks up, you still have a management path that does not rely on any of the infrastructure you are trying to fix. Explore the full Black Box networking catalog for complementary infrastructure management products.

Key Features

• Integrated POTS Modem: The built-in analog modem provides an out-of-band dial-up access path over a standard copper phone line — no IP connectivity required. This is the critical fallback for remote sites where sending a technician on-site is expensive or impractical. If your broadband circuit goes down, the POTS line stays up independently.
• Console Server Architecture: Designed to aggregate serial console ports from multiple devices into a single, centrally managed access point. Instead of maintaining individual console cables and direct physical access to each device, you manage serial sessions remotely through a single unit.
• Out-of-Band Management: By sitting on a separate management plane from your production network, the LES1716A-R2 lets you recover from network outages, misconfigurations, and firmware failures without needing in-band IP reachability to the affected device — exactly the scenario where standard SSH/Telnet access fails you.
• Black Chassis: Rack-mountable form factor consistent with the console server product category, suited for standard equipment racks in data centers, network closets, and remote branch offices.

Integration and Compatibility

Console servers of this type integrate with network management workflows by providing SSH or web-based access to serial ports, with the POTS modem acting as a secondary access method when primary connectivity is unavailable. For sites running managed network switches or critical routing infrastructure, pairing a console server with an analog fallback line is a standard resilience practice. The LES1716A-R2 (often searched as LES1716A R2) fits into out-of-band management architectures where continuous access to console ports — regardless of production network state — is a hard operational requirement. Consider pairing with a UPS to ensure the console server itself remains powered during the same outage events you are trying to manage through.

Deployment Context

This unit is appropriate for remote edge sites, colocation deployments, and branch offices where physical access is limited and a POTS line is available as a backup circuit. Data centers that have already eliminated analog phone lines will need to evaluate whether a cellular or secondary Ethernet out-of-band path is a better fit for their environment. For multi-device serial console aggregation needs, review Black Box's broader console server lineup to match port count to your device inventory.

Frequently Asked Questions

Q: What is the LES1716A-R2 used for?

A: The LES1716A-R2 is a console server with an integrated POTS modem, used primarily for out-of-band management of network devices and servers via serial console ports, with a dial-up analog modem as a fallback access path when IP connectivity is unavailable.

Q: Does the LES1716A-R2 require an active IP network to function?

A: No. The integrated POTS modem allows dial-up access over a standard analog phone line, providing management access independent of your IP network — which is the primary use case for this type of device.

Q: What color is the LES1716A-R2 chassis?

A: The LES1716A-R2 ships in a black chassis.

Q: Is the LES1716A-R2 rack-mountable?

A: Console servers in the Black Box LES series are designed for rack installation. Confirm rack-mount hardware inclusion with your order or contact pre-sales engineering for mounting configuration details.

Q: Who should consider the LES1716A-R2 over a console server without a modem?

A: Any site that maintains an active POTS line and needs a guaranteed out-of-band management fallback should consider the integrated modem variant. Sites that have decommissioned analog lines should evaluate models with cellular or dual-Ethernet OOB paths instead.

Karl Wilson

The LES1716A-R2 fills a specific gap that pure IP-based management tools cannot cover: getting into a device when the network itself is the thing that is broken. The integrated POTS modem is the differentiating factor here — it gives you a dial-up path over a copper phone line that is electrically and logically separate from your data infrastructure. For remote sites where dispatching a technician costs hundreds of dollars per visit, that fallback access pays for itself quickly.

Technical Highlights:

• POTS Modem Integration: The built-in analog modem eliminates the need for an external modem or separate out-of-band device — one unit handles both serial console aggregation and the fallback dial-up circuit.
• Console Server Function: Centralizes serial console access across multiple networked devices, replacing the need for individual direct console connections to each piece of infrastructure.
• Out-of-Band Management Path: The LES1716A-R2's separation from the production network means it remains accessible precisely when in-band tools fail — during outages, misconfigurations, or crashed network operating systems.

Deployment Considerations:

• Verify that your site has an active analog POTS line before deploying — the modem provides no value if no phone circuit is available, and many modern facilities have decommissioned copper telephony entirely.
• For environments without POTS availability, evaluate console server variants with cellular LTE modems or dual-Ethernet management interfaces as the out-of-band fallback instead.

The LES1716A-R2 is the right fit for remote branch offices, unmanned equipment rooms, and colocation deployments where a live POTS line exists and the cost or delay of on-site visits makes reliable remote console access a hard operational requirement.