Line Cards and Interface Cards: Matching a Card to Its Chassis

A line card is the part of a chassis-based platform that carries the actual ports. The shelf, the control cards and the software may all be identical between two deployments, while the line cards differ completely — which is why a card has to be selected against the platform, never on its own description.

What to establish first

• The exact chassis model and revision. Cards are qualified against specific shelves; a card that fits mechanically may not be supported by the software release in the shelf.
• The port type and count you need. Interface type, connector, and the density the slot will accept.
• Oversubscription and backplane capacity. A card’s port count says nothing about how much traffic it can move to the switch fabric — for aggregation roles that number is the one that matters.
• Software release compatibility. Some cards require a minimum release; upgrading a production shelf to take a card is a decision, not a formality.
• Whether the card needs a companion. Some interfaces require a matching physical interface module, and quoting the card alone produces a shelf that does not pass traffic.

Buying cards on the secondary market

Cards are where “same part number, different thing” happens most often: revision letters, region-coded variants and refurbished-versus-new all appear under names that look interchangeable. We state the exact part number, revision where the label carries one, and condition on the quotation, and we confirm the platform it is intended for before shipping.

Alcatel TRBD1111 cards, compared →  ·  Huawei CR53-P10 cards →  ·  Alcatel OSCU1010 →