Where-as the Huawei's use "dummy or empty" card front panels/trims are only distinguishable by the lack of LEDs etc, the ECI's use a "blank/ing plate" readily identified by its simplicity.
The ECIs also appear to totally omit the corresponding cables at those blank plate positions, compared with the Huawei having them in position - further disguising the non-working situation of those slots in the Huawei.
That suggests that there is more work needed to extend the ECI's to full normal capacity, without progressing beyond that.
In the Huawei cabinets, two different DSLAMs are used to provision the different number of subscribers; the AIO has the same MA5616T (for 128 lines) as the smaller Huawei cabinets... with capacity for 4 cards with 32 ports on each.
However, the ECI cabinets utilise the same M41 DSLAM ... it is just the amount of wiring that distinguishes between a 128-port variant and a 256-port variant.
The pictures you see on Kitz show both
- A 256-port, with 4 pre-wired connectors; 1 in use and 3 blanking plates that could all be upgraded
- A 128-port, with 2 pre-wired connectors; 2 in use, and 2 blanking plates that cannot be upgraded
I'm not sure I've heard of a 128 ECI being upgraded to 256 on the fly.