Removable card guides for horizontal line cards

1. A chassis for telecommunication gear including horizontal circuit boards, said chassis comprising

an enclosure forming a front-accessible circuit board slot for receiving horizontal circuit boards, and

multiple circuit board guides in said circuit board slot for guiding and securing horizontal circuit boards inserted into said slot, adjacent pairs of said guides being spaced to receive circuit boards of predetermined widths, at least one of said guides being removable so that it can be re-positioned within said slot for changing the spacing between adjacent pairs of said guides to receive circuit boards of different widths,

wherein the multiple circuit board guides comprise a pair of circuit board guides that are mirror images of each other and are attached back-to-back so that one of said pair forms a right-side guide and the other of said pair forms a left-side guide.

2. The chassis of claim 1 in which said enclosure has a height between about 1.5 and about 6 inches.

3. The chassis of claim 1 in which said enclosure has a width between about 17 and about 23 inches.

4. The chassis of claim 1 in which said circuit boards are telecommunication line cards.

5. The chassis of claim 1 in which said circuit board slot has a pair of fixed circuit board guides on opposite sides of said slot, and at least one removable circuit board guide between said fixed circuit board guides.

6. The chassis of claim 1 in which said removable card guide is detachably fastened to the bottom wall of said chassis with removable fasteners accessible through the front of said chassis.

7. The chassis of claim 1 in which said removable card guide is detachably fastened to the top wall of said chassis with removable fasteners accessible through the front of said chassis.

8. The chassis of claim 1 in which said removable card guide in which the bottom wall of said chassis forms at least one slot or opening, and said removable guide includes at least one hook located at the bottom of said removable guide for detachably securing said removable guide to said bottom wall by rotatably or slidably secured said hook into said slot or opening.

9. A method of installing horizontal circuit boards in a chassis having a front-accessible circuit board slot, said method comprising

inserting multiple horizontal circuit boards into a circuit board slot in an enclosure, and

guiding and securing said circuit boards within said slot with adjacent pairs of circuit board guides that are spaced to receive circuit boards of predetermined widths, at least one of said guides being removable so that it can be re-positioned within said slot, from the front of said chassis, for changing the spacing between adjacent pairs of said guides to receive circuit boards of different widths,

wherein the adjacent pairs of circuit board guides comprise a pair of circuit board guides that are mirror images of each other and are attached back-to-back so that one of said pair forms a right-side guide and the other of said pair forms a left-side guide.

10. The method of claim 9 in which said enclosure has a height between about 1.5 and 6 inches.

11. The method of claim 9 in which said enclosure has a width of about 17 inches.

12. The method of claim 9 in which said circuit boards are telecommunication line cards.

13. The method of claim 9 in which said circuit board slot has a pair of fixed circuit board guides on opposite sides of said slot, and at least one removable circuit board guide between said fixed circuit board guides.

14. The method of claim 9 in which said removable card guide is detachably fastened to the bottom wall of said circuit board slot with removable fasteners accessible through the front of said slot.