TN726B Data Line (8-Ports)
The TN726B provides 8 serial asynchronous EIA ports with modem interfaces connected through ADUs to EAI ports on DTE.
Features
- Ports: 8 EAI ports with modem interface
- Mode 2 or Mode 3 data transfer protocol
- DTE can be adjuncts and peripheral equipment
- Each port has TXT, TXR, PXT, and PXR signal leads
- Includes Atlas 1-Year Warranty with Extended Warranty options available!
Package Includes
- TN726B Data Line (8-Ports)
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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.
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$39.98
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{"id":331074437150,"title":"Avaya Definity TN570B Expansion Interface Circuit Pack","handle":"tn570b-expansion-interface","description":"\u003ch2\u003eTN570B Expansion Interface\u003c\/h2\u003e\n\u003cp\u003eThis card will provide an interface with the TDM bus and pack bus between the two. Fiber optic links interconnecting cabinets used in a Port Network (PN) between a PN and another PN in a direct-connect system.\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eProvides an interface\u003c\/li\u003e\n\u003cli\u003eSupports control channel applications\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\u003cbr\u003e\n\u003ch3\u003ePackage Includes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eTN570B Expansion Interface\u003c\/li\u003e\n\u003c\/ul\u003e","published_at":"2017-11-15T09:09:17-05:00","created_at":"2017-11-15T09:09:17-05:00","vendor":"Avaya","type":"TN420C - TN744E","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":31324036071504,"title":"Like New","option1":"Like New","option2":null,"option3":null,"sku":"Definity-TN570B-R","requires_shipping":true,"taxable":true,"featured_image":null,"available":true,"name":"Avaya Definity TN570B Expansion Interface Circuit Pack - Like New","public_title":"Like New","options":["Like New"],"price":3998,"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\/2_9b7e1bdc-2c25-4e75-9d85-e82ee7e573ba.jpg?v=1647622231","\/\/www.atlasphones.com\/cdn\/shop\/products\/1_0d762520-632a-4cd7-b3bd-419464705ae1.jpg?v=1647622231","\/\/www.atlasphones.com\/cdn\/shop\/products\/3_93c9bddd-29ab-4fbf-adde-7e86b05ab77c.jpg?v=1647622231"],"featured_image":"\/\/www.atlasphones.com\/cdn\/shop\/products\/2_9b7e1bdc-2c25-4e75-9d85-e82ee7e573ba.jpg?v=1647622231","options":["Choose Condition"],"media":[{"alt":"Avaya Definity TN570B Expansion Interface Circuit Pack Front Angle","id":22039969103952,"position":1,"preview_image":{"aspect_ratio":1.0,"height":800,"width":800,"src":"\/\/www.atlasphones.com\/cdn\/shop\/products\/2_9b7e1bdc-2c25-4e75-9d85-e82ee7e573ba.jpg?v=1647622231"},"aspect_ratio":1.0,"height":800,"media_type":"image","src":"\/\/www.atlasphones.com\/cdn\/shop\/products\/2_9b7e1bdc-2c25-4e75-9d85-e82ee7e573ba.jpg?v=1647622231","width":800},{"alt":"Avaya Definity TN570B Expansion Interface Circuit Pack Side Angle","id":22039969136720,"position":2,"preview_image":{"aspect_ratio":1.0,"height":800,"width":800,"src":"\/\/www.atlasphones.com\/cdn\/shop\/products\/1_0d762520-632a-4cd7-b3bd-419464705ae1.jpg?v=1647622231"},"aspect_ratio":1.0,"height":800,"media_type":"image","src":"\/\/www.atlasphones.com\/cdn\/shop\/products\/1_0d762520-632a-4cd7-b3bd-419464705ae1.jpg?v=1647622231","width":800},{"alt":"Avaya Definity TN570B Expansion Interface Circuit Pack Back Angle","id":22039969071184,"position":3,"preview_image":{"aspect_ratio":1.0,"height":800,"width":800,"src":"\/\/www.atlasphones.com\/cdn\/shop\/products\/3_93c9bddd-29ab-4fbf-adde-7e86b05ab77c.jpg?v=1647622231"},"aspect_ratio":1.0,"height":800,"media_type":"image","src":"\/\/www.atlasphones.com\/cdn\/shop\/products\/3_93c9bddd-29ab-4fbf-adde-7e86b05ab77c.jpg?v=1647622231","width":800}],"requires_selling_plan":false,"selling_plan_groups":[],"content":"\u003ch2\u003eTN570B Expansion Interface\u003c\/h2\u003e\n\u003cp\u003eThis card will provide an interface with the TDM bus and pack bus between the two. Fiber optic links interconnecting cabinets used in a Port Network (PN) between a PN and another PN in a direct-connect system.\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eProvides an interface\u003c\/li\u003e\n\u003cli\u003eSupports control channel applications\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\u003cbr\u003e\n\u003ch3\u003ePackage Includes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eTN570B Expansion Interface\u003c\/li\u003e\n\u003c\/ul\u003e"}
$149.00
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{"id":331074600990,"title":"Avaya Definity TN570C Expansion Interface Circuit Pack","handle":"tn570c-expansion-interface","description":"\u003ch2\u003eTN570C Expansion Interface\u003c\/h2\u003e\n\u003cp\u003eThis card will provide an interface with the TDM bus and pack bus between the two. Fiber optic links interconnecting cabinets used in a Port Network (PN) between a PN and another PN in a direct-connect system. used in SREPN (Survivable Remote Expansion Port Network) R7 or Later\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eProvides an interface\u003c\/li\u003e\n\u003cli\u003eSupports control channel applications\u003c\/li\u003e\n\u003cli\u003eUsed when ISDN-BRI and\/or ASAI is connected in an EPN\u003c\/li\u003e\n\u003cli\u003eUsed in R7 or later\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\u003cbr\u003e\n\u003ch3\u003ePackage Includes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eTN570C Expansion Interface\u003c\/li\u003e\n\u003c\/ul\u003e","published_at":"2017-11-15T09:09:23-05:00","created_at":"2017-11-15T09:09:24-05:00","vendor":"Avaya","type":"TN420C - TN744E","tags":[],"price":14900,"price_min":14900,"price_max":14900,"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":31324036038736,"title":"Like New","option1":"Like New","option2":null,"option3":null,"sku":"Definity-TN570C-R","requires_shipping":true,"taxable":true,"featured_image":null,"available":true,"name":"Avaya Definity TN570C Expansion Interface Circuit Pack - Like New","public_title":"Like New","options":["Like New"],"price":14900,"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\/1_2f33e2b8-8ffa-4af3-8941-a2e0f76cc74f.jpg?v=1647622501"],"featured_image":"\/\/www.atlasphones.com\/cdn\/shop\/products\/1_2f33e2b8-8ffa-4af3-8941-a2e0f76cc74f.jpg?v=1647622501","options":["Choose Condition"],"media":[{"alt":"Avaya Definity TN570C Expansion Interface Circuit Pack Top View","id":22039988633680,"position":1,"preview_image":{"aspect_ratio":1.0,"height":800,"width":800,"src":"\/\/www.atlasphones.com\/cdn\/shop\/products\/1_2f33e2b8-8ffa-4af3-8941-a2e0f76cc74f.jpg?v=1647622501"},"aspect_ratio":1.0,"height":800,"media_type":"image","src":"\/\/www.atlasphones.com\/cdn\/shop\/products\/1_2f33e2b8-8ffa-4af3-8941-a2e0f76cc74f.jpg?v=1647622501","width":800}],"requires_selling_plan":false,"selling_plan_groups":[],"content":"\u003ch2\u003eTN570C Expansion Interface\u003c\/h2\u003e\n\u003cp\u003eThis card will provide an interface with the TDM bus and pack bus between the two. Fiber optic links interconnecting cabinets used in a Port Network (PN) between a PN and another PN in a direct-connect system. used in SREPN (Survivable Remote Expansion Port Network) R7 or Later\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eProvides an interface\u003c\/li\u003e\n\u003cli\u003eSupports control channel applications\u003c\/li\u003e\n\u003cli\u003eUsed when ISDN-BRI and\/or ASAI is connected in an EPN\u003c\/li\u003e\n\u003cli\u003eUsed in R7 or later\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\u003cbr\u003e\n\u003ch3\u003ePackage Includes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eTN570C Expansion Interface\u003c\/li\u003e\n\u003c\/ul\u003e"}
$169.00
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{"id":331074666526,"title":"Avaya Definity TN572 Switch-Node Clock Circuit Pack","handle":"tn572-switch-node-clock","description":"\u003ch2\u003eTN572 Switch-Node Clock\u003c\/h2\u003e\n\u003cp\u003eThis card distributes the timing signals that synchronize the SN carrier. It also receives maintenance data.\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eTiming signals that synchronize the SN carrier\u003c\/li\u003e\n\u003cli\u003eReceives maintenance data\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\u003cbr\u003e\n\u003ch3\u003ePackage Includes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eTN572 Switch-Node Clock\u003c\/li\u003e\n\u003c\/ul\u003e","published_at":"2017-11-15T09:09:29-05:00","created_at":"2017-11-15T09:09:29-05:00","vendor":"Avaya","type":"TN420C - TN744E","tags":[],"price":16900,"price_min":16900,"price_max":16900,"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":31324036005968,"title":"Like New","option1":"Like New","option2":null,"option3":null,"sku":"Definity-TN572-R","requires_shipping":true,"taxable":true,"featured_image":null,"available":true,"name":"Avaya Definity TN572 Switch-Node Clock Circuit Pack - Like New","public_title":"Like New","options":["Like New"],"price":16900,"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\/1_cd68410f-c92c-4215-b48a-310456bcf6f0.jpg?v=1647622725"],"featured_image":"\/\/www.atlasphones.com\/cdn\/shop\/products\/1_cd68410f-c92c-4215-b48a-310456bcf6f0.jpg?v=1647622725","options":["Choose Condition"],"media":[{"alt":"Avaya Definity TN572 Switch-Node Clock Circuit Pack Top View","id":22040002035792,"position":1,"preview_image":{"aspect_ratio":1.0,"height":800,"width":800,"src":"\/\/www.atlasphones.com\/cdn\/shop\/products\/1_cd68410f-c92c-4215-b48a-310456bcf6f0.jpg?v=1647622725"},"aspect_ratio":1.0,"height":800,"media_type":"image","src":"\/\/www.atlasphones.com\/cdn\/shop\/products\/1_cd68410f-c92c-4215-b48a-310456bcf6f0.jpg?v=1647622725","width":800}],"requires_selling_plan":false,"selling_plan_groups":[],"content":"\u003ch2\u003eTN572 Switch-Node Clock\u003c\/h2\u003e\n\u003cp\u003eThis card distributes the timing signals that synchronize the SN carrier. It also receives maintenance data.\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eTiming signals that synchronize the SN carrier\u003c\/li\u003e\n\u003cli\u003eReceives maintenance data\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\u003cbr\u003e\n\u003ch3\u003ePackage Includes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eTN572 Switch-Node Clock\u003c\/li\u003e\n\u003c\/ul\u003e"}
$199.00
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{"id":331074928670,"title":"Avaya Definity TN573B Switch-Node Interface Circuit Pack","handle":"tn573b-switch-node-interface","description":"\u003ch2\u003eTN573B Switch-Node Interface\u003c\/h2\u003e\n\u003cp\u003eThis card routes circuit packet and control messages. TN573B and higher provides an interface to the single-mode fiber optic transceiver and supports the TN1654 and TN574 DS1 converter circuit pack.\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCircuits, packets, and control messages are routed\u003c\/li\u003e\n\u003cli\u003eProvides an interface to single-mode fiver optic transceiver and supports the TN1654 and TN574 DS1\u003c\/li\u003e\n\u003cli\u003eOne TN573B per PN and supports the TN574 DS1 converter circuit pack\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\u003cbr\u003e\n\u003ch3\u003ePackage Includes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eTN573B Switch-Node Interface\u003c\/li\u003e\n\u003c\/ul\u003e","published_at":"2017-11-15T09:09:37-05:00","created_at":"2017-11-15T09:09:37-05:00","vendor":"Avaya","type":"TN420C - TN744E","tags":[],"price":19900,"price_min":19900,"price_max":19900,"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":31324035973200,"title":"Like New","option1":"Like New","option2":null,"option3":null,"sku":"Definity-TN573B-R","requires_shipping":true,"taxable":true,"featured_image":null,"available":true,"name":"Avaya Definity TN573B Switch-Node Interface Circuit Pack - Like New","public_title":"Like New","options":["Like New"],"price":19900,"weight":907,"compare_at_price":null,"inventory_quantity":-3,"inventory_management":null,"inventory_policy":"deny","barcode":null,"requires_selling_plan":false,"selling_plan_allocations":[]}],"images":["\/\/www.atlasphones.com\/cdn\/shop\/products\/2_3cb9a8d4-933e-462f-95c7-ee5883408ee3.jpg?v=1647623181","\/\/www.atlasphones.com\/cdn\/shop\/products\/1_78b66ffe-ac96-4588-a0dc-8f4a334d517f.jpg?v=1647623181","\/\/www.atlasphones.com\/cdn\/shop\/products\/3_1cf298bb-b53f-4ce5-9abf-883d2c3fb5e9.jpg?v=1647623181","\/\/www.atlasphones.com\/cdn\/shop\/products\/4_24372120-d1cc-4503-8831-344b63a09d38.jpg?v=1647623181"],"featured_image":"\/\/www.atlasphones.com\/cdn\/shop\/products\/2_3cb9a8d4-933e-462f-95c7-ee5883408ee3.jpg?v=1647623181","options":["Choose Condition"],"media":[{"alt":"Avaya Definity TN573B Switch-Node Interface Circuit Pack Front Angle","id":22040030183504,"position":1,"preview_image":{"aspect_ratio":1.0,"height":800,"width":800,"src":"\/\/www.atlasphones.com\/cdn\/shop\/products\/2_3cb9a8d4-933e-462f-95c7-ee5883408ee3.jpg?v=1647623181"},"aspect_ratio":1.0,"height":800,"media_type":"image","src":"\/\/www.atlasphones.com\/cdn\/shop\/products\/2_3cb9a8d4-933e-462f-95c7-ee5883408ee3.jpg?v=1647623181","width":800},{"alt":"Avaya Definity TN573B Switch-Node Interface Circuit Pack Right Side Angle","id":22040030216272,"position":2,"preview_image":{"aspect_ratio":1.0,"height":800,"width":800,"src":"\/\/www.atlasphones.com\/cdn\/shop\/products\/1_78b66ffe-ac96-4588-a0dc-8f4a334d517f.jpg?v=1647623181"},"aspect_ratio":1.0,"height":800,"media_type":"image","src":"\/\/www.atlasphones.com\/cdn\/shop\/products\/1_78b66ffe-ac96-4588-a0dc-8f4a334d517f.jpg?v=1647623181","width":800},{"alt":"Avaya Definity TN573B Switch-Node Interface Circuit Pack Back Angle","id":22040030150736,"position":3,"preview_image":{"aspect_ratio":1.0,"height":800,"width":800,"src":"\/\/www.atlasphones.com\/cdn\/shop\/products\/3_1cf298bb-b53f-4ce5-9abf-883d2c3fb5e9.jpg?v=1647623181"},"aspect_ratio":1.0,"height":800,"media_type":"image","src":"\/\/www.atlasphones.com\/cdn\/shop\/products\/3_1cf298bb-b53f-4ce5-9abf-883d2c3fb5e9.jpg?v=1647623181","width":800},{"alt":"Avaya Definity TN573B Switch-Node Interface Circuit Pack Top View","id":22040030117968,"position":4,"preview_image":{"aspect_ratio":1.0,"height":800,"width":800,"src":"\/\/www.atlasphones.com\/cdn\/shop\/products\/4_24372120-d1cc-4503-8831-344b63a09d38.jpg?v=1647623181"},"aspect_ratio":1.0,"height":800,"media_type":"image","src":"\/\/www.atlasphones.com\/cdn\/shop\/products\/4_24372120-d1cc-4503-8831-344b63a09d38.jpg?v=1647623181","width":800}],"requires_selling_plan":false,"selling_plan_groups":[],"content":"\u003ch2\u003eTN573B Switch-Node Interface\u003c\/h2\u003e\n\u003cp\u003eThis card routes circuit packet and control messages. TN573B and higher provides an interface to the single-mode fiber optic transceiver and supports the TN1654 and TN574 DS1 converter circuit pack.\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCircuits, packets, and control messages are routed\u003c\/li\u003e\n\u003cli\u003eProvides an interface to single-mode fiver optic transceiver and supports the TN1654 and TN574 DS1\u003c\/li\u003e\n\u003cli\u003eOne TN573B per PN and supports the TN574 DS1 converter circuit pack\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\u003cbr\u003e\n\u003ch3\u003ePackage Includes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eTN573B Switch-Node Interface\u003c\/li\u003e\n\u003c\/ul\u003e"}
