ZyXEL Communications Multi-service Access Platform MSAP2000 - Manual (Page 54)

4. System Components
MSAP2000 Technical Manual V3.0 4-3
4.3. Shelf
MSAP2000 can be encased within any 19 or 23-inch rack, or any
standard rack which conforms to ETSI ETR 300 119 standards. The
rack is composed of a backplane and an external case. All wires within
the MSAP2000 shelf are ready-to-use, apart from trunking wires and
subscriber lines, which will have to be deployed by the subscribers
themselves. Dust covers will be provided for the unused slots within
the shelf. All of the subscribers’ copper lines are connected via wire
wrapping. Three connection ports: RS-232, Ethernet and RJ-11 are
located in the lower right hand corner of the shelf. These ports can
allow subscribers to connect to the LCT interface, the NMS interface,
and to Payphones/Order Wires.
Main
Shelf
Each MSAP2000 terminal includes a Main Shelf. Each Main Shelf is
composed of a shelf/chassis, power modules, main control modules,
trunking modules, and subscriber modules. The dip-switch on the
backplane of the main shelf will determine the function of this shelf,
within the overall network. Setup details will be listed in the
“Installation Procedure” section of this Manual.
Extension Shelf
Extension shelves are only used when the capacity of the main shelf is
insufficient. When adding an extension shelf, both the main shelf and
the extension shelf will need to have extension control modules
installed; the modules on both ends will then be linked by multi-module
optic fibers. The extension shelf itself is complete with its own shelf
case, power modules, extension control modules, and subscriber
modules. Within the Network Management System, the extension
shelf will be shown as a node within the network topology. For
example, if the main shelf is shown as 1, extension shelves can be
shown as any number from 2~8.