3060/X21
109001UA
P
ATTON
E
LECTRONICS
C
O
.
I
NSTALLATION
A
ND
O
PERATIONS
M
ANUAL
1-1
Operation
CHAPTER 1 - OPERATION
The 3060/X21 (CTS MD-X.21/TCB) is a network enhancement accessory intended for high
speed Synchronous or Asynchronous X.21 Modem, or port sharing applications. The 3060/
X21 (CTS MD-X.21/TCB) allows for immediate expansion of a system without the requirement
of additional communication lines. The 3060/X21 (CTS MD-X.21/TCB) allows up to six X.21
DCE or DTE devices to share a single X.21 DCE or DTE high speed link in a point-to-point or
multi-point polled network.
Clocking
The Patton 3060/X21 (CTS MD-X.21/TCB) is protocol transparent and operates in
synchronous and asynchronous environments at data rates up to 2048Kbps. Clocking can be
derived from the master port clock (pins 6 &13), the internal clock generator or any Sub-
Channel clock (pins 6 &13).
Fallback Clocking
In the event of loss of an externally provided clock the device has the ability to fall back to the
predetermined internal baud rate clock or to the clock provided on Sub-Channel 6.
Channel Interface
The 3060/X21 (CTS MD-X.21/TCB) has seven DB-15 female connectors located on the rear
of the unit. Each port is DCE/DTE selectable, which eliminates the need for a crossover
cable. The Control/Indicate output leads can be individually selected to follow the Modem or
be forced active. The Sub-Channel 6 Control/Indicate input lead can be forced Active or
allowed to follow the interface lead.