Specifications

Chapter 1 Introduction Installation and Operation Manual
1-12 Functional Description HS-RN MP-2100/2104 Ver. 12.6, MP-4100 Ver. 2.0
• Use of parity: if the user's data word format includes a parity bit, the user
can enable transparent end-to-end transfer of the original parity bit. The HS-
RN module itself does not check the parity of the incoming data.
• Number of stop bits: 1 or 2.
In addition to the selected parameters, the word format includes one start bit.
When setting the Async Mode parameters, pay attention to the total character
length calculated by the formula: M=data bits + parity + 1 start bit + stop bits.
This length can be set to 8,9,10, or 11. The numbers out of this range are not
supported.
Synchronous Mode
The data rates supported by both HS-RN models in the synchronous mode are
0.6, 1.2, 2.4, 4.8, 9.6, 19.2, 38.4, 56 and 64 kbps. The HDLC model additionally
features the data rates of 7.2, 14.4 and 28.8 kbps.
Interface Control Lines
The RS-232 interface control signals are locally supported in accordance with the
RS-232 protocol, with the following modifications:
• The DSR line is continuously active (ON), except when the end-to-end
transmission of control signals is enabled.
• The DCD line is ON only when both the channel framing machine and the local
Megaplex main link carrying the channel are synchronized, and is OFF when
either the channel framing machine or the main link loses synchronization.
• For flexibility in application, the user can program the state of the CTS line.
The available selections are:
 The CTS line is continuously active (ON).
 The state of the local CTS line tracks the state of the local RTS line.
As an alternative to local support as described above, the user can enable
end-to-end transmission of the states of the local DTR and RTS lines to the
remote DSR and DCD lines, respectively. Note that end-to-end transmission of
control signals is not supported at the 56 and 64 kbps channel rates.
Timing
When operating in the synchronous mode, the timing of the HS-RN channel
interfaces is locked to the Megaplex nodal timing.
The timing mode of each HS-RN module channel can be selected by the user. Two
options are available:
• DCE: the interface provides transmit and receive clock signals to the user's
data equipment (DTE). The user's DTE must receive and transmit at the rate
of the clock signals provided by the HS-RN channel interface.
• EXT DCE: the interface provides a receive clock signal to the user's DTE, and
accepts the transmit clock from the user's DTE. The user's DTE must operate
with loopback timing; that is, it must transmit at the rate of the receive clock
Note