Specifications

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WSS120 single-chassis system can provide up to 48-line with different analog line type configuration
combinations, and WSS120 dual-chassis system (main chassis and expansion chassis) can provide
maximum of 96-line with different analog line type configuration combination. WSS120 dual-chassis
system is a logical integrated system formed by adding an expansion chassis and interface cards on
top of the single chassis system. Only an expansion cable is required to connect the two chassises,
and the original main chassis will not be affected when connecting the expansion cable, suitable for
on-site capacity expansion. The system resources (eg. number of concurrent calls) are completely
determined by the main chassis, so users who are planning to expand capacity should take into
account the needs for future system resources when initially ordering the single-chassis system, to
support the smooth capacity expansion and upgrade.
Figure 1-10 Schematic Diagram for Front Panel of WSS120 Dual-Chassis System
Numbering definition of system interface slots: On the left side of main chassis is #1 slot (marked
with ① in Figure 1-10), on the right side of main chassis is #2 slot (marked with ③ in the Figure
1-10), on the left side of expansion chassis is #3 slot (marked with ② in the Figure 1-10), and on the
right side of expansion chassis is #4 slot, marked with ④ in Figure 1-10).
Figure 1-11 Schematic Diagram for Back Panel of WSS120 Dual-Chassis System
WSS120 dual-chassis system consists of a main chassis and an expansion chassis. Seen from the
front, it is different from the screen-printed mark: main chassis printed with "WSS120-MAIN" mark
and expansion chassis printed with "WSS120-EXT" mark. Seen from the back, the difference is
obvious: expansion chassis does not have status indicator, USB interface, CON interface and two
Ethernet interfaces. The main and expansion chassises have their own independent power supply and
cooling system, which are connected by a 36-core flat cable to form a logical integrated system.
To ensure the reliable communications between two chassises and reduce EMI interference, the
communication cable for connecting two chassises should be short. WSS120 dual-chassis system
must be placed adjacently in installation (users who plan to expand capacity should reserve a space
for expansion chassis during the initial installation of single chassis), the up or lower position is not
strictly required for the chassises.