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AT&T TN777B R12 V21 Network Controller
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Item Information
The TN777B Network Controller delivers control channel messages between distributed networks of port circuit packs on the TDM bus and processor circuit pack. Information is routed between 4 data channels directly from the processor circuit pack to the customer connected equipment.
Features
- Communicates control channel messages between the processor circuit pack and the distributed network of port circuit packs on the TDM bus
- Controls 4 data channels that process and route information directly from the processor circuit pack to customer connected equipment
- Has time of day clock with battery back for power failure or low voltage conditions
- Monitors the status of the system clocks and alerts the processor circuit pack in the event of a failure of any clock
- Also supports ISDN
- Replaced by TN794 Network Control/Packet interface for R7 and R8
- Replaced by TN2401 Network Control/Packet interface for R9 and R10
Included
- TN777B Network Controller
Refurbished
| Functionality |  |
|---|---|
| Cosmetics |  |
All refurbished items are restored to full functionality, and their grades reflect only cosmetic condition. Lower-grade products may have more visible blemishes but are rigorously tested and cleaned to ensure identical performance and warranty coverage.
PC Certified Guarantee
No-hassle returns. Zero restocking fees.
Wrong item? Changed your mind? Don't need it anymore? We've got you covered.
30-Day Returns
- No restocking fees, ever
- Refund or store credit — your choice
- 30 days from invoice date
- Return in original condition, securely packed
Fast Shipping
- Ships within 2 business days*
- Rush & Saturday delivery available — call us
- Free ground shipping available (continental US orders over $500)
- Overnight delivery available
1-Year Warranty
- Covers defects & functional failures
- Normal business use, from date of purchase
- Batteries: 90 days (consumable)
- Excludes misuse, modification, mishandling
Need help finding the right product?
Our team is ready with expert support before and after your purchase.
*Shipping and delivery on business days. Purchaser is responsible for return shipping costs and insurance. Free/fixed shipping offers exclude palletized items — call for freight rates.
Certified Refurbished
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Supplying IT to Businesses Since 1991
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Returns
No restocking fee, and no hassle returns on refurbs within 30 days.
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