Premier Farnell
ribbon cable, twist/flat, 50way, per m; pitch:1.27mm; cores, no. of:50; wire size, awg:28awg; conductor area csa:0.072mm²; voltage, rating:300v; approval bodies:ul, csa; cable type:twist and flat; cable ul style number:ul cl2; capacitance:14pf/ft; colour:50 colour reepeat ; conductor make-up:7/36awg; conductor material:tinned copper; current rating:1.3a; impedance:115ohm; no. of pairs:25; primary insulation material:pvc; resistance, insulation:10000mohm; temp, op. max:105°c; temp, op. min:-20°c; voltage rating, ac:300v
http://grh.premierfarnell.com/grh.aspx?mid=1000954&sku=169-2... Newark
ribbon cable, twist/flat, 50way; reel length (imperial):100ft; reel length (metric):30.48m; pitch:1.27mm; cores, no. of:50; wire size, awg:28awg; conductor area csa:0.072mm2; voltage, rating:300v; approval bodies:ul, csa; cable ;rohs compliant: yes
http://www.newark.com/jsp/search/productdetail.jsp?SKU=59M77... 
