172001UA
CHAPTER 1 - Operation
The Patton 2021P (CTS TCB-V.24/X.21) is an EIA RS-232 to CCITT X.21
interface converter with a built in tail circuit buffer, allowing modem to
modem interconnection. The interface converter operates bi-directionally.
DCE / DTE selection of each port permits interfacing an RS-232 terminal or
modem to an X.21 terminal or modem. This interface converter can satisfy
all interface conversion requirements. This adapter is ideal for High Speed
Modems since it can operate at up to 128Kbps. Connection of two terminal
devices is not supported because internal clocking is not provided by this
device.
Devices can be separated up to 4000 feet away from the interface con-
verter on the balanced interface side and RS-232 devices can be separated
up to 50 feet away from the interface converter. The unit is supplied with a
female DB-25 for the RS-232 port and a female DB-15 for the CCITT X.21
port.
The interface converter is housed in a sturdy aluminum enclosure and has
an internal 110/220VAC switch selectable power supply. Sixteen of the
interface converters will also fit into the MCS-16 card rack for convenient
data center applications.
The unit can operate on standard power found in most countries.
IC-V.24/X.21
X.21 Modem
1-1
Typical Application
