ROLM 85540A Pbx Interface Card Channel Line Circuit Board Pcb

( Brand: Rolm ), ( Manufacturer Part Number: 85540A ), ( Part Type: Interface Card Board ), ( Unit Type: Unit ), ( Country/region Of Manufacture: United States )

Review ROLM Pbx Interface Card Channel Line Circuit Board Vintage Pcb

The Rolm 85540A PBX Interface Card is an essential component for integrating analog telephones with Private Branch Exchange (PBX) systems, manufactured by Rolm Communications in 1979. This interface card, specifically the channel line circuit board, is a key element of the Rolmphone 8000 PBX system.

Measuring approximately 11 inches by 8 inches, this circuit board boasts a rich set of features designed to facilitate seamless communication between multiple telephone lines and the PBX system. It features 24 individual channel line cards, each capable of supporting one analog telephone line. The channels are arranged in groups of four, with each group connected via a common bus.

Each channel line circuit on this board is equipped with a range of components, including transistors, diodes, resistors, capacitors, and inductors. These components contribute to the card's ability to convert analog signals from the telephone lines into digital signals that the PBX system can process.

The Rolm 85540A PBX Interface Card also comes with a built-in power supply, which ensures that the necessary voltage is supplied to each channel line circuit. This power supply is designed to provide a steady voltage level, ensuring optimal performance of the card and the connected telephone lines.

The card's design is robust, with components arranged in a well-thought-out layout to minimize the risk of signal interference. The board's pins and connectors are clearly labeled, making installation and troubleshooting a more straightforward process.

In summary, the Rolm 85540A PBX Interface Card channel line circuit board is a critical component for any Rolmphone 8000 PBX system, enabling the integration of multiple telephone lines. Its reliable design, robust construction, and clear labeling make it an excellent choice for telecommunications professionals seeking to expand their PBX system's capabilities.

The Rolm 85540A PBX Interface Card Channel Line Circuit Board from 1979 is an obsolete telecommunications component. Here are some potential pros and cons for considering the purchase of this item:

1. Vintage Appeal: This circuit board has historical value due to its age and association with early digital telephony systems.

2. Potential for Restoration: For hobbyists and collectors, this component could be a valuable addition to a vintage telephone system setup.

3. Unique Learning Experience: Working on and understanding this obsolete technology can offer an interesting educational experience.

1. Compatibility: This board is very old and may not be compatible with modern telephony systems or equipment.

2. Availability: Due to its age, this component is likely to be hard to find and may require significant effort to source.

3. Cost: Given its rarity and the time and resources required to locate and restore it, this board could be quite expensive.

4. Technical Complexity: Working with obsolete technology can be challenging and time-consuming, requiring a strong understanding of outdated telephony standards and technologies.

The Rolm 85540A PBX Interface Card Channel Line Circuit Board from 1979 is an intriguing but potentially challenging component for hobbyists and collectors interested in vintage telephony systems. Its historical value, potential for restoration, and unique learning experience are counterbalanced by its compatibility issues, limited availability, cost, and technical complexity.

If you are an avid collector or hobbyist with a strong interest in vintage telephony systems, this component may be a worthwhile investment. However, it is important to carefully consider the challenges and costs associated with its acquisition and restoration before making a purchase. Additionally, it may be helpful to explore alternatives, such as more readily available replacement components or simulated vintage systems, to achieve similar goals with less complexity and cost.

Details:

Includes our satisfaction guarantee described below. From an extensive vintage tech collection in New England with minor signs of wear consistent age. 30 day money-back guarantee. We resolve issues quickly and directly.

part #: 85540a prices

• $74.99-$99.99

specifications scimedcollectibles:

• brand: Rolm
• mpn: 85540a
• part type: Interface Card Board
• unit type: Unit
• country/region of manufacture: United States

general scimedcollectibles:

• Business Industrial > Other Business Industrial
• condition: Used

payments scimedcollectibles:

• credit card: Visa
• wallet: Apple-pay
• other

returns scimedcollectibles:

• method: Money back
• time: 30 Days
• paid by: Seller
• policy: Returns Accepted

seller scimedcollectibles:

• # reviews: 15320
• city: Tiverton, Rhode Island
• rating: 99.2%

offer scimedcollectibles:

• sold: 0
• quantity: 1
• best offers: True
• availability: In Stock
• started: July 3, 2025
• options: Ship-to-home

shipping scimedcollectibles:

• carrier: USPS
• type: Fixed
• class: Standard
• transit: 5-9 Days
• cost: $0.00
• service: USPS Ground Advantage