AT125-SM Allen Tel Bridging Adapter RJ21 Telco Harmonica 1x Female, 1x Male to RJ11 (6P2C) x 25 ports PN-phB-xxx Provides input-output connection (bridging) for 25 pair cable. Consists of 25 - 6 position, 2 conductor (RJ11) jacks wired to 2 - 25 pair amphenol connectors (1 male and 1 female) in standard tip ring sequence for series connection. For use where space does not allow the use of patch panels. Ideal as a patch panel using patch cords to make & change connections. Equipped with VELCRO brand touch fastener to insure a secure connection. VELCRO is a registered trademark of Velcro Industries B.V.