Se agrega validación al formulario de CM, la mac debe tener 12 carácteres entre 0-9 y a-z.

src/CablemodemBundle/Admin/CablemodemAdmin.php

@@ -61,7 +61,7 @@ class CablemodemAdmin extends WorkflowBaseAdmin
         $formMapper
             ->add('clientId')
             ->add('model')
-            ->add('mac')
+            ->add('mac','text',array('attr' => array('pattern' => '[a-zA-Z0-9]+','title' => 'Only accept [0-9a-zA-Z]', 'maxlength' => '12', 'minlength' => '12')))
             ->add('activationCode')
             ->add('node')
             ->add('profile')