Curiosity got the better of me, so I tried gooooooooogling paired pension plan and the following popped up: (ok, so I was waiting for a print job and had nothing better to do when trapped at the desk)
http://www.retirementdictionary.com/definitions/pairedplan•Revenue Procedure 2000-20 defines "Paired plans" as follows “ … either a combination of two or more defined contribution standardized plans or a combination of one or more defined contribution standardized plans and one defined benefit standardized plan (for example, a money purchase pension plan, a profit-sharing plan and a unit benefit or flat benefit pension plan), so designed that if any single plan, or combination of plans, is adopted by an employer, each plan by itself, or the plans together, will meet the nondiscrimination rules set forth in § 401(a)(4), the contribution and benefit limitations set forth in § 415, and the top-heavy provisions set forth in § 416. Paired plans must have the same sponsor. In addition, only one of the paired plans that an employer adopts may provide for disparity in contributions or benefits that is permitted under § 401(l). If one of the paired plans is a defined benefit plan that includes a final pay limitation as described in § 401(a)(5)(D), then the paired defined contribution plan(s) may not provide for disparity in contributions.”
•Under Revenue Procedure 2005-16, paired standardized plans are discontinued as separate categories of master&prototype plans