COMSWITCH-II that control and route traffic between the ports. These commands consist of single letters
preceded by a <BREAK>.
The COMSWITCH-H has the following features:
•
Customer security provided by a password and dialback dialstring.
•
Bypass ("straight-through") hardware that allows cabling and other basic installation procedures to be
verified prior to configuration.
•
A nonvolatile RAM that stores configuration data (baud rates, password, and dialstring).
•
A clock/calendar IC, after being set, provides date and time.
1.1.2 212A Intelligent Modem
The COMSWITCH-II is designed to function with a 212A compatible autodial modem with a Hayes instruction
set (a non-autodial modem can be used, providing the dialback feature is not required). A modem provides full
duplex transmission and reception of serial binary data at high-speed (bit rate of 1.2K bits per second).
For the COMSWITCH-H, the operating bit rate is set at 1.2K bits per second for operation.
1.1.3 Security Features of the COMSWITCH-II
To preclude the possibility of unwarranted intrusion, the COMSWITCH-II provides security features to safeguard
the integrity of the host system. There are specific COMSWITCH-II functional commands that may only be
executed by the on-site user, as well as commands that are unique to the remote user. Some commands may be
executed by both the on-site and the remote user. There are three system access levels:
•
NONE
Remote port is unable to connect to the MV/7800 computer system and cannot
change any of the configuration data. The local operator can change password,
dialstring, and configuration data.
•
LIMITED
Remote port can connect to the MV/7800 computer IAC port or only
communicate with the user terminal, but cannot change any of the
configuration data. The local operator cannot change password, dialstring,
or configuration data.
•
FULL
Remote port can connect to both port/pairs of the MV/7800 computer, and
can change the configuration parameters. The local operator cannot change
the password, dialstring, or configuration data.
The primary COMSWITCH-II security features are the password and dialstring options available to the on-site
user.
•
PASSWORD - The on-site user can select one 40-character password to be stored in the non-volatile
RAM. The remote user must match this password in order to establish a modem port connection and
subsequent access to the host system.
•
TELEPHONE DIALSTRING - The on-site user can select the option of storing one 40-character
dialstring in the COMSWITCH-II non-volatile RAM memory (when required, or when using a
non-autodial modem. This feature can be disabled). The thalstring is the actual string sent to the
autodial modem to dial the telephone number that the caller left. When a dialstring is used, remote
sessions can be established only from an agreed-upon telephone number.
043-003621
1-2
DGC CONFIDENTIAL -
INTERNAL USE ONLY
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