No in the standard of Oci's it has to have ticking. Actually the ticking is concentrated more on the back/spine/legs/tail then on the sides - its still on the sides.
On Abys the more the ticking the better.
A smoke is white at the base (or should be as white as possible) and either black, blue, or red, cream for most of the hair. Smoke is the "darkest" (3/4 color to 1/4 white. Then you have Shaded which is less color (1/2 color, 1/2 white) and Shell or Chinchilla (3/4 white and 1/4 color on the tips of the hair).
Here is the Aby ticking requirements:
COAT: soft, silky, fine in texture, but dense and resilient to the touch with a lustrous sheen. Medium in length but long enough to accommodate two or three dark bands of ticking.
Coat color: warm and glowing. Ticking: distinct and even, with dark colored bands contrasting with lighter colored bands on the hair shafts. Undercoat color clear and bright to the skin. Deeper color shades desired, however intensity of ticking not to be sacrificed for depth of color. Darker shading along spine allowed if fully ticked. Preference given to cats UNMARKED on the undersides, chest, and legs; tail without rings. Facial Markings: dark lines extending from eyes and brows, cheekbone shading, dots and shading on whisker pads are all desirable enhancements. Eyes accentuated by fine dark line, encircled by light colored area. Eye color: gold or green, the more richness and depth of color the better.
And the Ocicat:
COAT TEXTURE: short, smooth and satiny in texture with a lustrous sheen. Tight, close-lying and sleek, yet long enough to accommodate the necessary bands of color. There should be no suggestion of woolliness.
TICKING: all hairs except the tip of the tail are banded. Within the markings, hairs are tipped with a darker color, while hairs in the ground color are tipped with a lighter color.
COAT COLOR: all colors should be clear and pleasing. The lightest color is usually found on the face around the eyes, and on the chin and lower jaw. The darkest color is found on the tip of the tail. Contrast is scored separately.
CONTRAST: distinctive markings should be clearly seen from any orientation. Those on the face, legs, and tail may be darker than those on the torso. Ground color may be darker on the saddle and lighter on the underside, chin, and lower jaw. Penalties should be given if spotting is faint or blurred, though it must be remembered that pale colors will show less contrast than darker ones.