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The shelf, SCM, fan, rear panel and legacy DS1 and DSL card part numbers that keep an installed Adtran TA5000 chassis running.

Which TA5000 OLT cards, Combo PON optics and switch modules work together, and how to move from GPON to XGS-PON and 100G uplinks.

A buyer’s guide to Adtran telecom equipment: TA5000 fiber access, TA 900e gateways, DSL nodes, NetVanta and ONTs, new or used.

Compare Cisco Meraki MR44 and MR46 access points, the MX85 appliance and the Catalyst 9120, with PoE and license tips for used gear.

Compare Cisco routers for branch and metro sites, from the ISR 1000 and Catalyst 8200 to the 8300 and ASR 920, with slots and SD-WAN speeds.

How to match Cisco SFP transceivers to speed, fiber and distance, with DOM, S-Class and RS-FEC explained for 1G to 100G optics.

How the Cisco Nexus 9000 leaf and spine models compare, from the 93180YC-FX3 to the 9364C, plus where the UCS 2408 IO module fits.

Choose between the Cisco Catalyst 9300, 9300X and 9500, decode -E and -A licenses, and plan the move off older 2960-X and 3850 switches.

How to pick a Cisco Catalyst 9200, 9200L or 9200CX switch, with PoE budgets, uplink modules, power supplies and stacking explained.

A plain guide to Cisco networking equipment: Catalyst, Nexus, routers, Meraki and optics, plus licensing, end of sale dates and buyback.