Northern Telecom NTRB53AA Clock Controller Pack NNTM18324FD08 Rack Mount Module

Northern Telecom NTRB53AA Clock Controller Pack NNTM18324FD08 Rack Mount Module New surplus Northern Telecom NTRB53AA clock controller circuit pack in an opened original reusable container. Card surfaces, solder joints, and edge connectors are clean with no signs of installation or rework; front faceplate, LEDs, and connectors show no handling wear. Outer cardboard box has light shelf and handling wear from storage. Supplied with anti-static bag and foam-lined Nortel box only; no manuals, cables, or additional

accessories; not tested in a live system. Brand: Northern TelecomItem: NTRB53AA C pack / clock controller plug-in circuit pack rack-mount card for Northern Telecom telecommunications systems.Front gray rack-mount faceplate includes CC designation, status LED indicators, an enable switch labeled "Emb" and "CC", and three front connectors including two 9-pin D-sub ports labeled DIS and J1 SEC plus a high-density connector labeled J2 PRI with a protective strap.Construction: Large multi-layer FR-4 printed circuit board populated with numerous DIP ICs, discrete resistors and capacitors, yellow axial capacitors, a Billey TV15B616 16.384000 MHz crystal controlled oscillator module, and dual high-density backplane edge connectors along the lower edge.Board markings include the Northern Telecom "nt" logo, silkscreen reference designators for components and test points, and a barcode label with assembly identifier NNTM18324FD08 and type code QPC471H.Box label details: Product ID NTRB53AA, described as "C PACK - CLOCK CONTROLLER", release 68, quantity 1 EA, and "MADE IN MEXICO" along with additional Nortel internal part codes and barcodes.Designed for installation into compatible Northern Telecom / Nortel systems that accept NTRB53AA clock controller circuit packs with NNTM18324FD08 / QPC471H assembly codes and rack-mount form factor.Includes the NTRB53AA clock controller circuit pack in its anti-static bag with reusable foam-lined cardboard shipping container exactly as shown in the listing photos.No 12-digit UPC or 13-digit EAN retail barcode is printed; barcodes on the box correspond to Northern Telecom part and internal identification data. Brem storage 0010