If your AT&T U‑Verse receiver, Cisco set‑top box, or similar IPTV device suddenly won't power on, the problem might not be the box itself—it could be the small power adapter that's been quietly doing its job for years. The Cisco ADS0202-U120167 is one of those essential components that's easy to overlook until it stops working. This guide explains what this adapter does, which devices it powers, and what to consider when replacing it.
This article is written for home entertainment users, IT support staff, and anyone responsible for maintaining Cisco IPTV receivers or similar set‑top box deployments. If you're troubleshooting a device that won't power on or looking for a replacement adapter, this information will help you get back up and running quickly.
What Is the Cisco ADS0202-U120167?
The Cisco ADS0202-U120167 is an external AC‑to‑DC power adapter designed for specific Cisco set‑top boxes, most notably the AT&T U‑Verse ISB7005 receiver. It converts standard wall outlet power (100‑240V AC) into a regulated 12V DC output at 1.67A, delivering up to 20 watts of power.
The adapter is sometimes referred to by its model number ADS0202-U120167 or by related part numbers such as 1010536 or 2103-30202022R. It features a 5.5mm outer diameter barrel connector with a 1.7mm center pin—a common connector type for many consumer electronics, but one that requires careful verification to ensure compatibility.
This is a wall‑wart style adapter, meaning the power supply brick is integrated directly into the plug that goes into the wall outlet, rather than having a separate "brick" connected by a long AC cord. This compact design makes it convenient for home entertainment setups, though it may require some clearance around the outlet.
Which Devices Use This Adapter?
The ADS0202-U120167 is primarily associated with the following Cisco set‑top box models:
Primary Compatible Devices:
- Cisco ISB7005 — This is the most commonly cited compatible device. The ISB7005 is a U‑Verse IPTV receiver that does not have a built‑in DVR. It supports 1080p HD content and includes wireless networking capabilities.
- Cisco ISB7000 — This model is essentially the same as the ISB7500 but without the 500GB hard disk drive. It functions as an IP set‑top box for IPTV services.
Related Models:
- Cisco ISB7100 — Some listings also mention compatibility with the ISB7100 IP box.
- Cisco ISB7500 — While the ISB7500 includes a 500GB hard drive, it may use the same or a similar power adapter.
Important Note: The adapter is specifically designed for AT&T U‑Verse and similar IPTV set‑top boxes. While some sellers may list compatibility with "universal" devices, the primary and most reliable use case is for the ISB7000 and ISB7005 series receivers.
If you're using a different Cisco set‑top box model, verify the power requirements on the device's label or in the user manual before using this adapter.
Understanding the 5.5mm × 1.7mm Connector
One of the most important details about this adapter is its connector. The ADS0202-U120167 uses a 5.5mm outer diameter barrel plug with a 1.7mm center pin.
This connector type is common in consumer electronics, but it's easy to confuse with similar-looking connectors:
- 5.5mm × 2.1mm — A slightly larger center pin. A 2.1mm plug will not fit securely into a 1.7mm jack, and forcing it can damage the device's power input port.
- 5.5mm × 2.5mm — Even larger. Will not fit.
- 4.0mm × 1.7mm — Smaller outer diameter. Won't fit securely.
Before purchasing a replacement adapter, physically inspect your device's DC input port. If it accepts a plug approximately 5.5mm in diameter with a visible center pin, the ADS0202-U120167 is the correct type. However, always verify the center pin size—1.7mm is smaller than the more common 2.1mm. The best way to confirm is to check the label on your original adapter, which should clearly state "5.5mm" or specify the connector dimensions.
Power Requirements: Why 12V and 1.67A Matter
The ADS0202-U120167 delivers 12V DC at 1.67A, providing approximately 20 watts of power. This specification is critical for several reasons:
Voltage must match exactly. The set‑top box is designed to operate on 12V DC. Using an adapter with a different voltage—even a slightly higher one—can damage the device's internal components. A lower voltage may not provide enough power for the device to operate properly.
Current must be equal or greater. The adapter provides 1.67A. A replacement adapter should provide at least 1.67A. A higher‑current adapter (e.g., 2A) is safe—the device only draws what it needs. However, a lower‑current adapter may cause the device to malfunction or fail to power on under load.
Polarity matters. While most barrel connectors are center‑positive, it's always worth confirming. The ADS0202-U120167 uses a center‑positive configuration. If you're using a third‑party replacement, verify that the polarity matches the original adapter's specification.
Can This Adapter Be Used With Other Devices?
While the ADS0202-U120167 is designed for Cisco set‑top boxes, it may be possible to use it with other devices that share the same electrical specifications—12V DC, at least 1.67A, 5.5mm × 1.7mm connector, center‑positive polarity.
However, there are important caveats:
Not for IP phones or network equipment. The adapter's primary design is for set‑top boxes. Some listings may suggest broader compatibility with "IP phones" or "network devices", but these claims should be verified carefully. Most Cisco IP phones require 48V power supplies, not 12V. Using this 12V adapter on a device that requires 48V will not work and could damage the device. Similarly, network switches and routers typically have different power requirements.
Check the device label first. The safest approach is to check the power requirements on your device's label or in its user manual. If it specifies 12V DC, 1.67A (or less), and a 5.5mm × 1.7mm connector, the ADS0202-U120167 should work. If the specifications differ, do not use this adapter.
Generic adapters are risky. While universal power adapters may seem convenient, they may not provide the stable, regulated power that sensitive electronics require. They may also lack proper safety certifications.
Common Problems and Troubleshooting
When a set‑top box isn't powering on, the power adapter is often the first suspect—but it's not always the culprit. Here's a practical troubleshooting approach:
Device doesn't power on at all: First, check that the adapter is securely plugged into both the wall outlet and the device. If the adapter feels cold after being plugged in for several minutes, it may have failed internally. Try a different outlet to rule out a dead wall socket.
Device powers on intermittently: This can indicate a loose connection at the device's DC input port or a failing adapter. Inspect the adapter's cable for visible damage, kinks, or fraying. If the cable looks fine, try testing with a known‑good ADS0202-U120167 adapter—if the problem disappears, your original adapter is failing.
Adapter runs unusually hot: While all power adapters generate some heat during normal operation, excessive heat—to the point where the adapter is uncomfortable to touch—indicates a problem. This could be due to internal component failure, a short circuit, or simply age‑related degradation. Replace the adapter promptly.
Device powers on but doesn't function correctly: If the set‑top box powers on but fails to boot properly, display video, or connect to the network, the adapter may not be providing stable power. This is more common with third‑party or generic adapters that don't meet the same quality standards as the OEM unit.
Physical damage: Frayed cables, bent or broken connector pins, or cracked casing are all signs that the adapter needs replacement.
If you've ruled out the adapter and the device still doesn't work, the issue may be with the set‑top box itself—such as a failed power input port, internal power supply, or other component failure.
When to Replace Your Adapter
Power adapters have a finite lifespan. In a home entertainment environment where the device is used daily, expect the adapter to last approximately 3 to 5 years of regular use. Here are clear signs that it's time to replace the ADS0202-U120167:
- Complete failure: The device doesn't power on at all, and you've confirmed the outlet works.
- Intermittent operation: The device powers on and off randomly, or the adapter only works when the cable is held at a specific angle.
- Overheating: The adapter becomes too hot to touch during normal operation, or you notice a burning smell.
- Physical damage: Frayed cables, bent connector pins, cracked casing, or any sign of wear that exposes internal wiring.
- Unusual noises: Buzzing, humming, or clicking sounds from the adapter indicate internal component failure.
If you notice any of these signs, replace the adapter promptly. A failing power supply can damage the set‑top box's internal components over time.
How to Avoid Buying the Wrong Replacement
When shopping for a replacement for the Cisco ADS0202-U120167, here are practical tips to ensure you get the right one:
1. Match the output voltage exactly. The adapter outputs 12V DC. Do not substitute with an adapter that outputs a different voltage—even if the connector fits.
2. Check the connector type. The adapter uses a 5.5mm × 1.7mm barrel connector. This is a specific size—not the more common 5.5mm × 2.1mm. Verify the connector dimensions before purchasing.
3. Verify the current rating. The adapter provides 1.67A. Any replacement should provide at least 1.67A. A higher‑current adapter (e.g., 2A) is safe; a lower‑current adapter is not.
4. Confirm polarity. The adapter uses center‑positive polarity. Most barrel connectors are center‑positive, but it's worth confirming.
5. Look for safety certifications. Genuine Cisco adapters and reputable third‑party replacements will carry safety certifications such as CE, UL, FCC, or RoHS. These indicate that the product has been tested for electrical safety and electromagnetic compatibility.
6. Be cautious with "universal" adapters. Universal power adapters with multiple tips may not provide the stable, regulated power that sensitive electronics require. They may also lack proper safety certifications. When in doubt, stick with a replacement that is specifically designed for Cisco set‑top boxes.
7. Check the model number. Look for ADS0202-U120167 or related part numbers such as 1010536 or 2103-30202022R. While these are not the only compatible options, they are the most reliable indicators of a correct match.
Frequently Asked Questions
Q: What are the exact specifications of the Cisco ADS0202-U120167?
A: The ADS0202-U120167 outputs 12V DC at 1.67A, delivering approximately 20W of power. It accepts 100‑240V AC input and uses a 5.5mm × 1.7mm barrel connector with center‑positive polarity.
Q: Which devices are compatible with this adapter?
A: The adapter is primarily designed for Cisco ISB7005 and ISB7000 set‑top boxes used with AT&T U‑Verse and similar IPTV services. Some listings also mention ISB7100 and ISB7500 compatibility.
Q: Can I use this adapter with a Cisco IP phone?
A: Typically no. Most Cisco IP phones require 48V power supplies, not 12V. Using this 12V adapter on a device that requires 48V will not work and could damage the device. Always check your device's power requirements before using any adapter.
Q: Can I use a standard 12V adapter from another device?
A: Only if it matches all specifications: 12V DC, at least 1.67A, 5.5mm × 1.7mm connector, and center‑positive polarity. Even then, quality and safety certifications vary—OEM or reputable third‑party replacements are recommended.
Q: What is the connector size for this adapter?
A: The adapter uses a 5.5mm outer diameter barrel plug with a 1.7mm center pin. This is different from the more common 5.5mm × 2.1mm connector.
Q: Is the ADS0202-U120167 still available from Cisco?
A: Cisco may have discontinued this specific model. However, compatible replacements are available from third‑party manufacturers. When purchasing, verify that the replacement meets all specifications and carries appropriate safety certifications.
Q: How do I know if my adapter is failing?
A: Common signs include the device not powering on, intermittent operation, the adapter running excessively hot, physical damage to the cable or casing, or unusual noises (buzzing, hissing). If you notice any of these, replace the adapter promptly.
Q: Can I use a higher‑current adapter with my set‑top box?
A: Yes. As long as the voltage is exactly 12V and the connector is correct, a higher‑current adapter (e.g., 2A) can safely power your device—the device only draws the current it needs. However, never use an adapter with a different voltage.
Q: How long does this adapter typically last?
A: With daily use in a home entertainment environment, most power adapters last 3 to 5 years. Factors such as physical stress on the cable, exposure to heat, and power surges can shorten this lifespan.
Q: What should I look for in a replacement adapter?
A: Look for an adapter that matches the output voltage (12V DC), provides at least 1.67A, has a 5.5mm × 1.7mm connector, uses center‑positive polarity, and carries safety certifications like CE, UL, or FCC.
Q: Why does my set‑top box power on but show no video?
A: This could be caused by an adapter that's not providing stable power, but it could also be an issue with the HDMI or AV connection, the TV input selection, or the set‑top box itself. Try testing with a known‑good adapter first to rule out power issues.
If you're looking for a compatible replacement for the Cisco ADS0202-U120167 power adapter, you may also be interested in our related power adapter guides and replacement products for set‑top boxes and IPTV receivers.
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