This chapter covers technical aspects of the hardware connections as well as power, physical, and environmental requirements for the hardware. This chapter discusses
multiplexer serial ports
multiplexer power, physical, and environmental specifications
All ports are asynchronous, with Data Terminal Equipment (DTE) pinouts and full modem control. Allowed baud rates range from 75 baud to 115.2 Kbaud out. The RS-232 signals supported are TXD, RXD, RTS, CTS, DSR, DTR, DCD, and GND.
|Note: The RS-232 serial ports on Challenge and Onyx systems transmit asynchronous data at a maximum rate of 19.2 Kbaud.|
The ST-1600 and ST-1616 multiplexer are Data Terminal Equipment devices (DTE). See Figure 3-1 for the pin numbers on the 25-pin multiplexer connector.
The Challenge or Onyx system is a DTE device for purposes of serial port connection. See Figure 3-2 for the pin assignment on the 9-pin Challenge or Onyx serial port connector.
Table 3-1 shows a DTE to DTE serial connection such as would be made between the multiplexer and a Challenge or Onyx system.
|Note: Both pins 6 (DSR) and 8 (DCD) on the multiplexer are tied to pin 9 (DTR) on the Challenge or Onyx 9-pin connection.|
9-Pin Connector Signal
25-Pin Connector on Multiplexer
Transmitted Data (TXD)
Received Data (RXD)
Request to Send (RTS)
Clear to send (CTS)
Data Terminal Ready (DTR)
6 Data Set Ready (DSR)
Signal Ground (GND)
Data Terminal Ready (DTR)
Data Carrier Detect (DCD)
20 Data Terminal Ready (DTR)
The RS-232 standard recommends the use of serial cables no longer than 50 feet
(15.2 meters). Longer runs introduce a greater possibility of line noise occurring. This can affect data transmission and cause errors. For cable runs longer than 50 feet (15.2 meters), use an appropriate extender device.
The Origin200 (tty_1 Console port), Origin2000 deskside, and Onyx2 deskside systems use a 9-pin male port to connect to the multiplexer. Figure 3-4 provides the pin specifications for this connector.
The Origin2000 and Onyx2 rack multimodule system controller (MMSC) ports and the Origin200 AUX port are 8-pin serial connectors. Table 3-2 and Figure 3-5 provide pin specifications for this 8-pin connector.
Data Terminal Ready
Clear To Send
Request To Send
Data Carrier Detect
All power requirements are provided by the standalone power supply included with your unit.
The power supply is auto-ranging and comes with a 110-VAC power cord in Japan and North America. All other destinations should use a 220-VAC rated power cord.
Power usage is typically as follows:
+5 VDC, 1500 mA maximum, 1110 mA typical
12 VDC, 100 mA maximum (full load), 1 mA (unloaded)
The operating environment for the multiplexer should meet the following specifications:
operating temperature: 0°C to 55°C
storage temperature: -40°C to 75°C
operating/storage humidity: 0 to 95% non-condensing
Each type of multiplexer uses the following amount of space (be sure to allow for all cable connections when choosing a location for placement):
depth: 11.0 inches (28.1 cm)
width: 8.1 inches (20.6 cm)
height: 1.2 inches (3.1 cm)
weight: 3.8 lbs (1.7 kg)
The shipping weight of the multiplexer is 14 lbs (6.3 kg), maximum, with power supply, excluding optional cables or other equipment.