TN420C - TN744E

Avaya Definity TN573B Switch-Node Interface Circuit Pack

SKU: Definity-TN573B-R
Vendor:Avaya

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Like New: $199.00

Availability: In Stock

$199.00

Quantity :

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

TN573B Switch-Node Interface

This 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.

Features

Circuits, packets, and control messages are routed
Provides an interface to single-mode fiver optic transceiver and supports the TN1654 and TN574 DS1
One TN573B per PN and supports the TN574 DS1 converter circuit pack
Includes Atlas 1-Year Warranty with Extended Warranty options available!

Package Includes

TN573B Switch-Node Interface

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

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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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Jahlawny E. Verified Customer

03-26-25

Good

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Matthew S. Verified Customer

03-26-25

The price is more than fair! I'm looking forward to receiving my order.

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See more reviews on Shopper Approved

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Avaya Definity TN570B Expansion Interface Circuit Pack

$39.98

Quick View {"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"}

TN420C - TN744E

Avaya Definity TN570C Expansion Interface Circuit Pack

$149.00

Quick View {"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"}

TN420C - TN744E

Avaya Definity TN572 Switch-Node Clock Circuit Pack

$169.00

Quick View {"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"}

TN420C - TN744E

Avaya Definity TN722B DS1 Tie Trunk Circuit Pack

$65.00

Quick View {"id":331075092510,"title":"Avaya Definity TN722B DS1 Tie Trunk Circuit Pack","handle":"tn722b-ds1-tie-trunk","description":"\u003ch2\u003eTN722B DS1 Tie Trunk\u003c\/h2\u003e\n\u003cp\u003eThe TN722B connects the 8 ports of multi-appearance hybrid analog and 24 independent trunk connections of digital voice terminals.\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e8 Ports connecting Hybrid analog and Digital voice\u003c\/li\u003e\n\u003cli\u003eThree types of digital tie trunk interfaces: voice-grade DS1, alternate voice\/data (AVD) DS1 tie trunks, and digital-multiplexed interface (DMI) Provides Bit-Oriented Signaling (BOS) on the automatic, immediate-start, delay-dial, and release-link trunks\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cbr\u003e\n\u003ch3\u003ePackage Includes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eTN722B DS1 Tie Trunk\u003c\/li\u003e\n\u003c\/ul\u003e","published_at":"2017-11-15T09:09:46-05:00","created_at":"2017-11-15T09:09:47-05:00","vendor":"Avaya","type":"TN420C - TN744E","tags":[],"price":6500,"price_min":6500,"price_max":6500,"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":31324035809360,"title":"Like New","option1":"Like New","option2":null,"option3":null,"sku":"Definity-TN722B-R","requires_shipping":true,"taxable":true,"featured_image":null,"available":true,"name":"Avaya Definity TN722B DS1 Tie Trunk Circuit Pack - Like New","public_title":"Like New","options":["Like New"],"price":6500,"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_846fe007-8ed7-4881-86b5-deb6480ccb7c.jpg?v=1647623478","\/\/www.atlasphones.com\/cdn\/shop\/products\/2_b175a860-5e8a-45cc-8bf3-21d0bc41b98f.jpg?v=1647623478","\/\/www.atlasphones.com\/cdn\/shop\/products\/3_080b33c2-236e-4436-b1e9-544ed137fe23.jpg?v=1647623478","\/\/www.atlasphones.com\/cdn\/shop\/products\/1281556774942.jpg?v=1647623478"],"featured_image":"\/\/www.atlasphones.com\/cdn\/shop\/products\/1_846fe007-8ed7-4881-86b5-deb6480ccb7c.jpg?v=1647623478","options":["Choose Condition"],"media":[{"alt":"Avaya Definity TN722B DS1 Tie Trunk Circuit Pack Right Side Angle","id":22040046436432,"position":1,"preview_image":{"aspect_ratio":1.0,"height":800,"width":800,"src":"\/\/www.atlasphones.com\/cdn\/shop\/products\/1_846fe007-8ed7-4881-86b5-deb6480ccb7c.jpg?v=1647623478"},"aspect_ratio":1.0,"height":800,"media_type":"image","src":"\/\/www.atlasphones.com\/cdn\/shop\/products\/1_846fe007-8ed7-4881-86b5-deb6480ccb7c.jpg?v=1647623478","width":800},{"alt":"Avaya Definity TN722B DS1 Tie Trunk Circuit Pack Front Angle","id":22040046403664,"position":2,"preview_image":{"aspect_ratio":1.0,"height":800,"width":800,"src":"\/\/www.atlasphones.com\/cdn\/shop\/products\/2_b175a860-5e8a-45cc-8bf3-21d0bc41b98f.jpg?v=1647623478"},"aspect_ratio":1.0,"height":800,"media_type":"image","src":"\/\/www.atlasphones.com\/cdn\/shop\/products\/2_b175a860-5e8a-45cc-8bf3-21d0bc41b98f.jpg?v=1647623478","width":800},{"alt":"Avaya Definity TN722B DS1 Tie Trunk Circuit Pack Back Angle","id":22040046370896,"position":3,"preview_image":{"aspect_ratio":1.0,"height":800,"width":800,"src":"\/\/www.atlasphones.com\/cdn\/shop\/products\/3_080b33c2-236e-4436-b1e9-544ed137fe23.jpg?v=1647623478"},"aspect_ratio":1.0,"height":800,"media_type":"image","src":"\/\/www.atlasphones.com\/cdn\/shop\/products\/3_080b33c2-236e-4436-b1e9-544ed137fe23.jpg?v=1647623478","width":800},{"alt":"TN722B DS1 Tie Trunk Top View","id":1961209364560,"position":4,"preview_image":{"aspect_ratio":1.0,"height":800,"width":800,"src":"\/\/www.atlasphones.com\/cdn\/shop\/products\/1281556774942.jpg?v=1647623478"},"aspect_ratio":1.0,"height":800,"media_type":"image","src":"\/\/www.atlasphones.com\/cdn\/shop\/products\/1281556774942.jpg?v=1647623478","width":800}],"requires_selling_plan":false,"selling_plan_groups":[],"content":"\u003ch2\u003eTN722B DS1 Tie Trunk\u003c\/h2\u003e\n\u003cp\u003eThe TN722B connects the 8 ports of multi-appearance hybrid analog and 24 independent trunk connections of digital voice terminals.\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e8 Ports connecting Hybrid analog and Digital voice\u003c\/li\u003e\n\u003cli\u003eThree types of digital tie trunk interfaces: voice-grade DS1, alternate voice\/data (AVD) DS1 tie trunks, and digital-multiplexed interface (DMI) Provides Bit-Oriented Signaling (BOS) on the automatic, immediate-start, delay-dial, and release-link trunks\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cbr\u003e\n\u003ch3\u003ePackage Includes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eTN722B DS1 Tie Trunk\u003c\/li\u003e\n\u003c\/ul\u003e"}

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