Memotec CX900e, Hardware Reference Manual, Page: 48 / 200

CX900e Hardware Reference Manual
4-2
3006M100-002
4.1 DEM Component
Important components on the Data Expansion Module include:
• edge connector
• Integrated Multiprotocol Processor (including three SCCs)
• seventh port option
4.1.1 Processor
An Integrated Multiprotocol Processor (IMPP) at U9 controls the DEM’s circuits
and logic. The IMPP incorporates two serial communication controllers to handle
serial ports provided by cards mounted in slot 5 and slot 6. It incorporates another
SCC to handle traffic of an optional V.24 port that it can provide over a ribbon
cable.
4.1.2 Seventh Port Option
Port
Connector
The IMPP provides the SCC for an optional seventh port. This port is a V.24
(EIA-232D) with a female DB-25 connector. This connector mounts on the rear
panel of the chassis through a knock-out; its ribbon cable attaches to a 26-pin
socket on the DEM at J1.
Speed
The optional seventh port can operate without split clocking at the following
synchronous speeds:
• 50 bps - 128 Kbps for external clocking
• 1875 bps - 128 Kbps for internal clocking
Figure 4-1 Data Expansion Module (DEM)