Gentlefolk,
Huawei cabinets were the first VDSL ones to be installed generally in the field (As opposed to "specials" near Martlesham Heath etc.).
Unlike the Huawei ones, ECI cabinets are all identical externally be they ECI 128 or ECI 256; they also have more ventilation slots (for the dogs benefit !!) when compared to the smaller Huawei ones which are about the same size. I have guessed that John's is an ECI 256 as it has two grey ducts providing ample space for 4 * 100 pr and 2 * 50 pr tie cables, a quad tube fibre "cable" and the 5 pr telemetry cable. One of the smaller black ducts is for the 240 Volt mains cable.
The rules governing the cabinet sizes are cloaked in mystery and secrecy ! Some being delivered at full capacity as Kitz illustrated in Lancashire** and some at half capacity with varying numbers of ducts and cables. Some of the blunders in Ewhurst where all cabinets were delivered as ECI 128s, two only had a single duct and all only had one 100pair set. Additional expansion has now been "engineered" adding only a 50 pr set plus an access chamber to span the old and new street ducts at PCP 20 but they have managed to jam in a second 100 pr set in PCP19. The next expansion stage capacity is 128 for PCPs 19 and 20 but both can't (yet) accommodate a full 256 channels if BT have worked out a process to partially dismantle the live ECI cabinets to add the IDC blocks, double cables and the additional line cards.
Polton is quite obviously a high class area as the cabinets are yet to be adorned with graffiti !
**
http://forum.kitz.co.uk/index.php/topic,11701.msg224287.html#msg224287Kind regards,
Walter