Black Box LES1708A-R2 Console Server with Dual POTS Modem

Overview

The Black Box LES1708A-R2 is a console server with dual POTS modem capability, designed for out-of-band management of network and security infrastructure. Console servers in this class let administrators reach routers, switches, firewalls, and other headless devices over a dial-up POTS line when the primary IP network is down or unreachable — a critical capability in branch offices, remote sites, and co-location facilities where a network outage would otherwise mean a truck roll. The LES1708A-R2 (often searched as LES1708A R2) targets environments where reliable fallback access is non-negotiable. Explore the full Black Box networking and infrastructure catalog for complementary products.

Key Features

• Dual POTS Modem: Two independent dial-up modem channels mean a single unit can support redundant out-of-band paths or serve two separate device groups simultaneously — reducing the number of console server units needed at a remote site.
• Console Server Architecture: Provides serial console access to connected devices, so you can recover a crashed router or reconfigure a switch without requiring IP reachability to the target device — exactly the access model that prevents expensive after-hours site visits.
• Out-of-Band Management: Because the POTS path is physically separate from your primary data network, a complete LAN or WAN failure does not affect your ability to connect — a meaningful distinction from in-band SSH jump hosts that go dark with the rest of the network.
• Remote Site Applicability: Well-suited to unmanned console server deployments at branch offices, utility substations, or edge compute locations where a local technician may not be available during an outage.

Integration & Compatibility

The LES1708A-R2 connects to devices via serial console ports (RS-232), a standard interface across routers, managed switches, firewalls, and network video recorders from virtually every major vendor. POTS-based out-of-band management integrates with existing phone infrastructure without requiring cellular or broadband backup services, making it a cost-effective fallback for sites that already have a POTS line in place. For sites planning a broader network infrastructure refresh, pairing this unit with in-band management tools creates a layered access strategy. Consult a PoE switch selection guide when planning the broader access layer this console server will manage.

Frequently Asked Questions

Q: What is the LES1708A-R2 used for?

A: The LES1708A-R2 is a console server with dual POTS modem support, used for out-of-band remote management of network devices over a standard dial-up phone line when the primary IP network is unavailable.

Q: What does 'dual POTS modem' mean on the LES1708A-R2?

A: Dual POTS means the unit includes two independent Plain Old Telephone Service modem interfaces, allowing two separate out-of-band dial-up connections or redundant fallback paths from a single device.

Q: What devices can I manage with the LES1708A-R2?

A: Any device with a serial console port (RS-232) — including routers, managed switches, firewalls, and servers — can be managed through this console server.

Q: Is the LES1708A-R2 suitable for unmanned remote sites?

A: Yes. Console servers with POTS modem fallback are specifically designed for remote or unmanned locations where IP network outages would otherwise require an on-site technician.

Q: Does the LES1708A-R2 require a broadband connection to function?

A: No. The out-of-band POTS modem path operates over a standard analog phone line, independent of broadband or LAN connectivity.

Ted Perry

The LES1708A-R2 is one of those units that earns its rack space by being invisible until it matters most. The dual POTS modem design is the key differentiator here — two independent analog fallback paths from a single appliance means you're not trading redundancy for rack density at a remote site.

Technical Highlights:

• Dual POTS Modem: Two modem channels on one unit — use both for redundant dial-in paths to the same site, or split them across two separate device groups without adding a second appliance.
• Out-of-Band Console Access: Serial console connectivity to headless devices is the core function — this is the path you reach for when SSH is down, not a secondary option.
• POTS Independence: The analog phone line path has no dependency on the IP network, switches, or routers you're trying to recover — which is the entire point of out-of-band management architecture.

Deployment Considerations:

• Verify the remote site has active POTS lines before deploying — POTS availability is declining in some regions as carriers sunset analog infrastructure, and the LES1708A-R2's fallback path depends entirely on that physical line being live.
• Plan serial cable runs to each managed device at installation time; retrofitting console cable access in a live rack is significantly harder than running cables during initial commissioning.

The LES1708A-R2 is the right fit for branch office or utility substation deployments where a POTS line is already present and the cost of a truck roll during a network outage justifies the investment in dedicated out-of-band access hardware.