 The transmit/receive path of the analog voice signal is through a series of magnetic-latching reed switches (very similar to latching relays).The much smaller Remreed crosspoints, introduced at about the same time as 1AESS, were packaged as grid boxes of four principal types.Type 10A Junctor Grids and 11A Trunk Grids were a box about 16x16x5 inches (40x40x12 cm) with sixteen 8x8 switches inside.