RESEARCH ALERT-Barclays cuts Adtran to underweight

Oct 5 (Reuters) - :

* Barclays cuts Adtran Inc to underweight from equal weight; price

target to $13 from $18

* Barclays cuts F5 Networks Inc to equal weight from overweight; price

target to $105 from $115

* Barclays raises Acme Packet Inc price target to $20 from $13

* Barclays raises Riverbed Technology Inc price target to $21 from $20

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