Avaya/Definity Circuit Packs TN429 - TN748

Avaya Definity TN727 Network Control (TN727)

SKU: DefinityTN727-R
Vendor:Avaya

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Always only $9.95 for orders under $500!*

Like New: $49.00

Availability: In Stock

$49.00

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Choose Condition

C.Pitts03-26-25

We were in search of phones that had been discontinued for quite some time, and I am delighted to have discovered this website. The entire process-from placing the order to receiving the devices-was seamless and highly efficient. The website is clean, user-friendly, and easy to navigate, which made browsing and purchasing straightforward.After placing the order, the phones arrived within the promised time frame and were in excellent condition. The company provided timely updates regarding the status of my order without overwhelming me with unnecessary promotional messages. This level of communication was both reassuring and professional.I highly recommend this company/website, especially for those seeking older, discontinued devices.

Marco T.03-12-25

I had an outstanding online shopping experience. The website was intuitive and easy to navigate, with clear product descriptions that made decision-making a breeze. The checkout process was smooth, and shipping was prompt and reliable. Overall, the high-quality products and attentive customer service made this purchase truly satisfying, and I would highly recommend this retailer for anyone looking for a hassle-free online shopping experience.

C.Pitts03-26-25

Description
Reviews

Avaya Definity TN727 Network Control (TN727)

The Avaya Definity TN727 Network Control Card is also known as the Switch Interface (SI) board. This board will provide users a bidirectional path for transferring status and control information between devices.

Features

TN727 Network Control (TN727)
Transfers status and control information
Continuously scans the TD bus for messages and hardware problems
Includes Atlas 1-Year Warranty with Extended Warranty options available!

Compatibility

The Avaya Definity TN727 Network Control is compatible with the Avaya Definity phone system.

Product Reviews from Verified Customers

We're currently collecting product reviews for this item. In the meantime, here are some company reviews from our past customers sharing their overall shopping experience.

4.9

3901 Reviews

5

3600 (92%)
4

280 (7%)
3

17 (0%)
2

1 (0%)
1

3 (0%)

99% of customers rate this company 4- or 5-stars

Highest to Lowest
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Favorite Reviews

All Ratings
5 ★ Reviews
4 ★ Reviews
3 ★ Reviews
2 ★ Reviews
1 ★ Reviews

Jerry J. Verified Customer

03-29-25

This order was easy to place.

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C.Pitts Verified Customer

03-26-25

We were in search of phones that had been discontinued for quite some time, and I am delighted to have discovered this website. The entire process-from placing the order to receiving the devices-was seamless and highly efficient. The website is clean, user-friendly, and easy to navigate, which made browsing and purchasing straightforward. After placing the order, the phones arrived within the promised time frame and were in excellent condition. The company provided timely updates regarding the status of my order without overwhelming me with unnecessary promotional messages. This level of communication was both reassuring and professional. I highly recommend this company/website, especially for those seeking older, discontinued devices.

See Less

Jahlawny E. Verified Customer

03-26-25

Good

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See more reviews on Shopper Approved

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Quick View {"id":330403151902,"title":"Avaya Definity TN464HP DS1\/ISDN PRI Circuit Pack","handle":"tn464hp-ds1-isdn-pri-circuit-pack","description":"\u003ch2\u003eTN464HP DS1\/ISDN PRI Circuit Pack\u003c\/h2\u003e \u003cp\u003e The TN464HP DS1\/ISDN PRI Circuit Pack will support all versions of ISDN-PRI connectivity. This circuit pack can communicate with Avaya Interactive Response System. \u003c\/p\u003e \u003ch3\u003eFeatures\u003c\/h3\u003e \u003cul\u003e \u003cli\u003eStratum-3 clock capability\u003c\/li\u003e \u003cli\u003eSupport for CO, TIE, DID, and OPS\u003c\/li\u003e \u003cli\u003eCRC-4 generation and checking\u003c\/li\u003e \u003cli\u003eEcho cancellation support\u003c\/li\u003e \u003cli\u003eDownloadable firmware\u003c\/li\u003e \u003cli\u003eRussian incoming ANI support\u003c\/li\u003e \u003cli\u003eUniversal, digital, signal level 1 equipment in wideband ISDN-PRI applications support\u003c\/li\u003e \u003cli\u003eTest-jack access to the DS1 or E1 line\u003c\/li\u003e \u003cli\u003eSupport for 120A integrated channel service unit module\u003c\/li\u003e \u003cli\u003eLine-In, Line-Out signal leads for unpolarized, balanced pairs\u003c\/li\u003e \u003cli\u003e \u003c\/li\u003e\n\u003cli\u003eCircuit-pack-level - administrable A-, Mu-Law companying\u003c\/li\u003e \u003cli\u003eOne Year Warranty Included with Extended Warranty Options at Low Prices!\u003c\/li\u003e \u003c\/ul\u003e","published_at":"2017-11-15T04:31:14-05:00","created_at":"2017-11-15T04:31:15-05:00","vendor":"Avaya","type":"Avaya\/Definity Circuit Packs TN429 - TN748","tags":[],"price":3998,"price_min":3998,"price_max":3998,"available":true,"price_varies":false,"compare_at_price":null,"compare_at_price_min":0,"compare_at_price_max":0,"compare_at_price_varies":false,"variants":[{"id":31324318892112,"title":"Like New","option1":"Like New","option2":null,"option3":null,"sku":"Definity-TN464HP-R","requires_shipping":true,"taxable":true,"featured_image":null,"available":true,"name":"Avaya Definity TN464HP DS1\/ISDN PRI Circuit Pack - Like New","public_title":"Like New","options":["Like New"],"price":3998,"weight":907,"compare_at_price":null,"inventory_quantity":-6,"inventory_management":null,"inventory_policy":"deny","barcode":null,"requires_selling_plan":false,"selling_plan_allocations":[]}],"images":["\/\/www.atlasphones.com\/cdn\/shop\/products\/1_f189a6f6-b25e-4d62-b129-836ab9ad3d0a.jpg?v=1612292692","\/\/www.atlasphones.com\/cdn\/shop\/products\/3_dc07d063-7329-41cf-a199-2213ea0c3e1b.jpg?v=1612292699","\/\/www.atlasphones.com\/cdn\/shop\/products\/2_51f4beb3-ab44-4c10-9c51-e0e1654dffe1.jpg?v=1612292703"],"featured_image":"\/\/www.atlasphones.com\/cdn\/shop\/products\/1_f189a6f6-b25e-4d62-b129-836ab9ad3d0a.jpg?v=1612292692","options":["Choose Condition"],"media":[{"alt":"Avaya Definity TN464HP DS1\/ISDN PRI Circuit Pack Side Angle","id":9272342806608,"position":1,"preview_image":{"aspect_ratio":1.0,"height":800,"width":800,"src":"\/\/www.atlasphones.com\/cdn\/shop\/products\/1_f189a6f6-b25e-4d62-b129-836ab9ad3d0a.jpg?v=1612292692"},"aspect_ratio":1.0,"height":800,"media_type":"image","src":"\/\/www.atlasphones.com\/cdn\/shop\/products\/1_f189a6f6-b25e-4d62-b129-836ab9ad3d0a.jpg?v=1612292692","width":800},{"alt":"Avaya Definity TN464HP DS1\/ISDN PRI Circuit Pack Front Angle","id":9272342741072,"position":2,"preview_image":{"aspect_ratio":1.0,"height":800,"width":800,"src":"\/\/www.atlasphones.com\/cdn\/shop\/products\/3_dc07d063-7329-41cf-a199-2213ea0c3e1b.jpg?v=1612292699"},"aspect_ratio":1.0,"height":800,"media_type":"image","src":"\/\/www.atlasphones.com\/cdn\/shop\/products\/3_dc07d063-7329-41cf-a199-2213ea0c3e1b.jpg?v=1612292699","width":800},{"alt":"Avaya Definity TN464HP DS1\/ISDN PRI Circuit Pack Back Angle","id":9272342773840,"position":3,"preview_image":{"aspect_ratio":1.0,"height":800,"width":800,"src":"\/\/www.atlasphones.com\/cdn\/shop\/products\/2_51f4beb3-ab44-4c10-9c51-e0e1654dffe1.jpg?v=1612292703"},"aspect_ratio":1.0,"height":800,"media_type":"image","src":"\/\/www.atlasphones.com\/cdn\/shop\/products\/2_51f4beb3-ab44-4c10-9c51-e0e1654dffe1.jpg?v=1612292703","width":800}],"requires_selling_plan":false,"selling_plan_groups":[],"content":"\u003ch2\u003eTN464HP DS1\/ISDN PRI Circuit Pack\u003c\/h2\u003e \u003cp\u003e The TN464HP DS1\/ISDN PRI Circuit Pack will support all versions of ISDN-PRI connectivity. This circuit pack can communicate with Avaya Interactive Response System. \u003c\/p\u003e \u003ch3\u003eFeatures\u003c\/h3\u003e \u003cul\u003e \u003cli\u003eStratum-3 clock capability\u003c\/li\u003e \u003cli\u003eSupport for CO, TIE, DID, and OPS\u003c\/li\u003e \u003cli\u003eCRC-4 generation and checking\u003c\/li\u003e \u003cli\u003eEcho cancellation support\u003c\/li\u003e \u003cli\u003eDownloadable firmware\u003c\/li\u003e \u003cli\u003eRussian incoming ANI support\u003c\/li\u003e \u003cli\u003eUniversal, digital, signal level 1 equipment in wideband ISDN-PRI applications support\u003c\/li\u003e \u003cli\u003eTest-jack access to the DS1 or E1 line\u003c\/li\u003e \u003cli\u003eSupport for 120A integrated channel service unit module\u003c\/li\u003e \u003cli\u003eLine-In, Line-Out signal leads for unpolarized, balanced pairs\u003c\/li\u003e \u003cli\u003e \u003c\/li\u003e\n\u003cli\u003eCircuit-pack-level - administrable A-, Mu-Law companying\u003c\/li\u003e \u003cli\u003eOne Year Warranty Included with Extended Warranty Options at Low Prices!\u003c\/li\u003e \u003c\/ul\u003e"}

Avaya/Definity Circuit Packs TN429 - TN748

Avaya Definity TN472C Audix DBP-CPU (TN472C)

$94.99

Quick View {"id":330336960542,"title":"Avaya Definity TN472C Audix DBP-CPU (TN472C)","handle":"avaya-definity-tn472c-audix-dbp-cpu-tn472c","description":"\u003ch2\u003eAvaya Definity TN472C Audix DBP-CPU (TN472C)\u003c\/h2\u003e\n\u003cp\u003eThe Avaya Definity TN472C Audix DBP-CPU will provide users with a CPU that performs file system data-base management. This CPU card has the ability to handle initialization and maintenance for the DBP subsystem.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAvaya Definity TN472C Audix DBP-CPU\u003c\/li\u003e\n\u003cli\u003eIncludes\u003cspan style=\"color: #6aa84f;\"\u003e\u003ca href=\"https:\/\/www.atlasphones.com\/pages\/warranty-policy\" target=\"_blank\" style=\"color: #85bc04;\" rel=\"noopener noreferrer\"\u003e Atlas 1-Year Warranty\u003c\/a\u003e\u003c\/span\u003e with Extended Warranty options available!\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAvaya Definity Phone System\u003c\/li\u003e\n\u003c\/ul\u003e","published_at":"2017-11-15T03:08:31-05:00","created_at":"2017-11-15T03:08:32-05:00","vendor":"Avaya","type":"Avaya\/Definity Circuit Packs TN429 - TN748","tags":[],"price":9499,"price_min":9499,"price_max":9499,"available":true,"price_varies":false,"compare_at_price":null,"compare_at_price_min":0,"compare_at_price_max":0,"compare_at_price_varies":false,"variants":[{"id":31324378955856,"title":"Like New","option1":"Like New","option2":null,"option3":null,"sku":"DefinityTN472C-R","requires_shipping":true,"taxable":true,"featured_image":null,"available":true,"name":"Avaya Definity TN472C Audix DBP-CPU (TN472C) - Like New","public_title":"Like New","options":["Like New"],"price":9499,"weight":907,"compare_at_price":null,"inventory_quantity":1,"inventory_management":null,"inventory_policy":"deny","barcode":null,"requires_selling_plan":false,"selling_plan_allocations":[]}],"images":["\/\/www.atlasphones.com\/cdn\/shop\/products\/1278973378590.jpg?v=1612291375","\/\/www.atlasphones.com\/cdn\/shop\/products\/1278973345822.jpg?v=1612291375","\/\/www.atlasphones.com\/cdn\/shop\/products\/1278973411358.jpg?v=1604693822","\/\/www.atlasphones.com\/cdn\/shop\/products\/1278973444126.jpg?v=1604693822"],"featured_image":"\/\/www.atlasphones.com\/cdn\/shop\/products\/1278973378590.jpg?v=1612291375","options":["Choose Condition"],"media":[{"alt":"Avaya Definity TN472C Audix DBP-CPU Side Angle","id":1961484058704,"position":1,"preview_image":{"aspect_ratio":1.0,"height":800,"width":800,"src":"\/\/www.atlasphones.com\/cdn\/shop\/products\/1278973378590.jpg?v=1612291375"},"aspect_ratio":1.0,"height":800,"media_type":"image","src":"\/\/www.atlasphones.com\/cdn\/shop\/products\/1278973378590.jpg?v=1612291375","width":800},{"alt":"Avaya Definity TN472C Audix DBP-CPU Sideways Angle","id":1961484025936,"position":2,"preview_image":{"aspect_ratio":1.0,"height":800,"width":800,"src":"\/\/www.atlasphones.com\/cdn\/shop\/products\/1278973345822.jpg?v=1612291375"},"aspect_ratio":1.0,"height":800,"media_type":"image","src":"\/\/www.atlasphones.com\/cdn\/shop\/products\/1278973345822.jpg?v=1612291375","width":800},{"alt":"Avaya Definity TN472C Audix DBP-CPU Front Angle","id":1961484091472,"position":3,"preview_image":{"aspect_ratio":1.0,"height":800,"width":800,"src":"\/\/www.atlasphones.com\/cdn\/shop\/products\/1278973411358.jpg?v=1604693822"},"aspect_ratio":1.0,"height":800,"media_type":"image","src":"\/\/www.atlasphones.com\/cdn\/shop\/products\/1278973411358.jpg?v=1604693822","width":800},{"alt":"Avaya Definity TN472C Audix DBP-CPU Top View","id":1961484124240,"position":4,"preview_image":{"aspect_ratio":1.0,"height":800,"width":800,"src":"\/\/www.atlasphones.com\/cdn\/shop\/products\/1278973444126.jpg?v=1604693822"},"aspect_ratio":1.0,"height":800,"media_type":"image","src":"\/\/www.atlasphones.com\/cdn\/shop\/products\/1278973444126.jpg?v=1604693822","width":800}],"requires_selling_plan":false,"selling_plan_groups":[],"content":"\u003ch2\u003eAvaya Definity TN472C Audix DBP-CPU (TN472C)\u003c\/h2\u003e\n\u003cp\u003eThe Avaya Definity TN472C Audix DBP-CPU will provide users with a CPU that performs file system data-base management. This CPU card has the ability to handle initialization and maintenance for the DBP subsystem.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAvaya Definity TN472C Audix DBP-CPU\u003c\/li\u003e\n\u003cli\u003eIncludes\u003cspan style=\"color: #6aa84f;\"\u003e\u003ca href=\"https:\/\/www.atlasphones.com\/pages\/warranty-policy\" target=\"_blank\" style=\"color: #85bc04;\" rel=\"noopener noreferrer\"\u003e Atlas 1-Year Warranty\u003c\/a\u003e\u003c\/span\u003e with Extended Warranty options available!\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAvaya Definity Phone System\u003c\/li\u003e\n\u003c\/ul\u003e"}

Avaya/Definity Circuit Packs TN429 - TN748

Avaya Definity TN475B Sadi Disk Controller (TN475B)

$199.98

Quick View {"id":330337091614,"title":"Avaya Definity TN475B Sadi Disk Controller (TN475B)","handle":"avaya-definity-tn475b-sadi-disk-controller-tn475b","description":"\u003ch2\u003eAvaya Definity TN475B Sadi Disk Controller (TN475B)\u003c\/h2\u003e\n\u003cp\u003eThe Avaya Definity TN475B Sadi Disk Controller will provide users with a disk controller for the Audix System. The SADI comes equipped with LEDs to show which disk drives are connected and accessible.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAvaya Definity TN475B Sadi Disk Controller\u003c\/li\u003e\n\u003cli\u003e\n\u003c\/li\u003e\n\u003cli\u003eIncludes\u003cspan style=\"color: #6aa84f;\"\u003e\u003ca href=\"https:\/\/www.atlasphones.com\/pages\/warranty-policy\" target=\"_blank\" style=\"color: #85bc04;\" rel=\"noopener noreferrer\"\u003e Atlas 1-Year Warranty\u003c\/a\u003e\u003c\/span\u003e with Extended Warranty options available!\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAvaya Definity phone system\u003c\/li\u003e\n\u003c\/ul\u003e","published_at":"2017-11-15T03:08:40-05:00","created_at":"2017-11-15T03:08:40-05:00","vendor":"Avaya","type":"Avaya\/Definity Circuit Packs TN429 - TN748","tags":[],"price":19998,"price_min":19998,"price_max":19998,"available":true,"price_varies":false,"compare_at_price":null,"compare_at_price_min":0,"compare_at_price_max":0,"compare_at_price_varies":false,"variants":[{"id":31324378660944,"title":"Like New","option1":"Like New","option2":null,"option3":null,"sku":"DefinityTN475B-R","requires_shipping":true,"taxable":true,"featured_image":null,"available":true,"name":"Avaya Definity TN475B Sadi Disk Controller (TN475B) - Like New","public_title":"Like New","options":["Like New"],"price":19998,"weight":907,"compare_at_price":null,"inventory_quantity":1,"inventory_management":null,"inventory_policy":"deny","barcode":null,"requires_selling_plan":false,"selling_plan_allocations":[]}],"images":["\/\/www.atlasphones.com\/cdn\/shop\/products\/1278974263326.jpg?v=1612292908","\/\/www.atlasphones.com\/cdn\/shop\/products\/1278974230558.jpg?v=1612292908","\/\/www.atlasphones.com\/cdn\/shop\/products\/1278974296094.jpg?v=1604693822"],"featured_image":"\/\/www.atlasphones.com\/cdn\/shop\/products\/1278974263326.jpg?v=1612292908","options":["Choose Condition"],"media":[{"alt":"Avaya Definity TN475B Sadi Disk Controller Side Angle","id":1961190064208,"position":1,"preview_image":{"aspect_ratio":1.0,"height":800,"width":800,"src":"\/\/www.atlasphones.com\/cdn\/shop\/products\/1278974263326.jpg?v=1612292908"},"aspect_ratio":1.0,"height":800,"media_type":"image","src":"\/\/www.atlasphones.com\/cdn\/shop\/products\/1278974263326.jpg?v=1612292908","width":800},{"alt":"Avaya Definity TN475B Sadi Disk Controller Sideways Angle","id":1961190031440,"position":2,"preview_image":{"aspect_ratio":1.0,"height":800,"width":800,"src":"\/\/www.atlasphones.com\/cdn\/shop\/products\/1278974230558.jpg?v=1612292908"},"aspect_ratio":1.0,"height":800,"media_type":"image","src":"\/\/www.atlasphones.com\/cdn\/shop\/products\/1278974230558.jpg?v=1612292908","width":800},{"alt":"Avaya Definity TN475B Sadi Disk Controller Top View","id":1961190096976,"position":3,"preview_image":{"aspect_ratio":1.0,"height":800,"width":800,"src":"\/\/www.atlasphones.com\/cdn\/shop\/products\/1278974296094.jpg?v=1604693822"},"aspect_ratio":1.0,"height":800,"media_type":"image","src":"\/\/www.atlasphones.com\/cdn\/shop\/products\/1278974296094.jpg?v=1604693822","width":800}],"requires_selling_plan":false,"selling_plan_groups":[],"content":"\u003ch2\u003eAvaya Definity TN475B Sadi Disk Controller (TN475B)\u003c\/h2\u003e\n\u003cp\u003eThe Avaya Definity TN475B Sadi Disk Controller will provide users with a disk controller for the Audix System. The SADI comes equipped with LEDs to show which disk drives are connected and accessible.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAvaya Definity TN475B Sadi Disk Controller\u003c\/li\u003e\n\u003cli\u003e\n\u003c\/li\u003e\n\u003cli\u003eIncludes\u003cspan style=\"color: #6aa84f;\"\u003e\u003ca href=\"https:\/\/www.atlasphones.com\/pages\/warranty-policy\" target=\"_blank\" style=\"color: #85bc04;\" rel=\"noopener noreferrer\"\u003e Atlas 1-Year Warranty\u003c\/a\u003e\u003c\/span\u003e with Extended Warranty options available!\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAvaya Definity phone system\u003c\/li\u003e\n\u003c\/ul\u003e"}

Avaya/Definity Circuit Packs TN429 - TN748

Avaya Definity TN500 TDBI (TN500)

$48.99

Quick View {"id":330337255454,"title":"Avaya Definity TN500 TDBI (TN500)","handle":"avaya-definity-tn500-tdbi-tn500","description":"\u003ch2\u003eAvaya Definity TN500 TDBI (TN500)\u003c\/h2\u003e\n\u003cp\u003eThe Avaya Definity TN500 TDBI (Time Division Bus Interface) is the data-exchange interface between the TN520 VB and TN501B VPC boards as part of most AUDIX systems. The TN500 is designed to replace the TN477 with sixteen channels, twice the amount of its predecessor. The TN500 is installed in most AUDIX cabinets, and required for systems with five or more TN501Bs.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eIncludes sixteen (16) channels, twice the number available with the TN477\u003c\/li\u003e\n\u003cli\u003eRequired for cabinets with five (5) or more TN501Bs\u003c\/li\u003e\n\u003cli\u003eProvides data-exchange interface between TN520 VB and TN501B VPC boards in AUDIX systems\u003c\/li\u003e\n\u003cli\u003eOne year warranty included, with extended warranties available!\u003c\/li\u003e\n\u003c\/ul\u003e","published_at":"2017-11-15T03:08:48-05:00","created_at":"2017-11-15T03:08:49-05:00","vendor":"Avaya","type":"Avaya\/Definity Circuit Packs TN429 - TN748","tags":[],"price":4899,"price_min":4899,"price_max":4899,"available":true,"price_varies":false,"compare_at_price":null,"compare_at_price_min":0,"compare_at_price_max":0,"compare_at_price_varies":false,"variants":[{"id":31324378595408,"title":"Like New","option1":"Like New","option2":null,"option3":null,"sku":"DefinityTN500-R","requires_shipping":true,"taxable":true,"featured_image":null,"available":true,"name":"Avaya Definity TN500 TDBI (TN500) - Like New","public_title":"Like New","options":["Like New"],"price":4899,"weight":907,"compare_at_price":null,"inventory_quantity":1,"inventory_management":null,"inventory_policy":"deny","barcode":null,"requires_selling_plan":false,"selling_plan_allocations":[]}],"images":["\/\/www.atlasphones.com\/cdn\/shop\/products\/1278975311902.jpg?v=1604693821","\/\/www.atlasphones.com\/cdn\/shop\/products\/1278975344670.jpg?v=1604693821","\/\/www.atlasphones.com\/cdn\/shop\/products\/1278975377438.jpg?v=1604693821","\/\/www.atlasphones.com\/cdn\/shop\/products\/1278975410206.jpg?v=1604693821"],"featured_image":"\/\/www.atlasphones.com\/cdn\/shop\/products\/1278975311902.jpg?v=1604693821","options":["Choose Condition"],"media":[{"alt":"Avaya Definity TN500 TDBI Side Angle","id":1961476685904,"position":1,"preview_image":{"aspect_ratio":1.0,"height":800,"width":800,"src":"\/\/www.atlasphones.com\/cdn\/shop\/products\/1278975311902.jpg?v=1604693821"},"aspect_ratio":1.0,"height":800,"media_type":"image","src":"\/\/www.atlasphones.com\/cdn\/shop\/products\/1278975311902.jpg?v=1604693821","width":800},{"alt":"Avaya Definity TN500 TDBI Front Angle","id":1961476718672,"position":2,"preview_image":{"aspect_ratio":1.0,"height":800,"width":800,"src":"\/\/www.atlasphones.com\/cdn\/shop\/products\/1278975344670.jpg?v=1604693821"},"aspect_ratio":1.0,"height":800,"media_type":"image","src":"\/\/www.atlasphones.com\/cdn\/shop\/products\/1278975344670.jpg?v=1604693821","width":800},{"alt":"Avaya Definity TN500 TDBI Back Angle","id":1961476751440,"position":3,"preview_image":{"aspect_ratio":1.0,"height":800,"width":800,"src":"\/\/www.atlasphones.com\/cdn\/shop\/products\/1278975377438.jpg?v=1604693821"},"aspect_ratio":1.0,"height":800,"media_type":"image","src":"\/\/www.atlasphones.com\/cdn\/shop\/products\/1278975377438.jpg?v=1604693821","width":800},{"alt":"Avaya Definity TN500 TDBI Top View","id":1961476784208,"position":4,"preview_image":{"aspect_ratio":1.0,"height":800,"width":800,"src":"\/\/www.atlasphones.com\/cdn\/shop\/products\/1278975410206.jpg?v=1604693821"},"aspect_ratio":1.0,"height":800,"media_type":"image","src":"\/\/www.atlasphones.com\/cdn\/shop\/products\/1278975410206.jpg?v=1604693821","width":800}],"requires_selling_plan":false,"selling_plan_groups":[],"content":"\u003ch2\u003eAvaya Definity TN500 TDBI (TN500)\u003c\/h2\u003e\n\u003cp\u003eThe Avaya Definity TN500 TDBI (Time Division Bus Interface) is the data-exchange interface between the TN520 VB and TN501B VPC boards as part of most AUDIX systems. The TN500 is designed to replace the TN477 with sixteen channels, twice the amount of its predecessor. The TN500 is installed in most AUDIX cabinets, and required for systems with five or more TN501Bs.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eIncludes sixteen (16) channels, twice the number available with the TN477\u003c\/li\u003e\n\u003cli\u003eRequired for cabinets with five (5) or more TN501Bs\u003c\/li\u003e\n\u003cli\u003eProvides data-exchange interface between TN520 VB and TN501B VPC boards in AUDIX systems\u003c\/li\u003e\n\u003cli\u003eOne year warranty included, with extended warranties available!\u003c\/li\u003e\n\u003c\/ul\u003e"}

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