Chapter 3 Operation
3-3
If clock recover mode is automatic, Loop-V 4200 returns to the master clock source one minute after the
master clock is recovered. The current active clock source is automatically changed to master clock.
3.10.3 Console Port
The console port allows the user either to use a local VT-100 terminal or use a remote VT-100 terminal via
modem for system configuration, diagnostics, polling status reports, etc. An adapter cable from DB9P to
DB25P is required for modem operation. The console port baud, data bit length, stop bit length, parity bit
length, XON-XOFF flow control, and interface type are defaulted, as shown below.
Table 3- 1 Console Port Setting
Item Fixed Setting
Baud 9600
Data Length 8
Stop Bit 1
Parity NONE
XON-XOFF OFF
Interface DCE
3.10.4 Menu Lock
The LCD front panel and terminal are used to read alarms, system configurations, and system status. They
also can be used to change system configurations and clear the alarm queue, etc.. By enabling the menu-
lock, only read operations are allowed. Modifications to the current status are not allowed. Users may not
change system configurations or clear performance data. Menu Lock at the LCD and Password
configuration at the terminal are coordinated.
Password and menu-lock options are disabled by default.
• The default password is LOOP.
3.10.5 Logon, Logoff, and Password
Logoff prevents system configuration changes at the terminal, while logon allows system configuration
changes. The password feature is used to augment lock control against unauthorized terminal users from
changing system parameters, either from the terminal or from the LCD panel. With password enabled, logon
requires entering the correct password. If password is disabled, no password is required to logon.
• The default option of the password is disabled.
• The default password is LOOP.
3.11 Configuration
User can save the current configurations onto a non-volatile memory. This allows user to retrieve the last
stored configuration. Except for the time slot interchange configuration described below, which is part of the
main chassis, all other configurations refer to the plug-in cards, which are operative only when one or more
cards of those types are installed.
3.12 Time Slot Interchange (Digital Access Cross-Connect)
An important function of the Loop-V 4200 is time slot interchange (TSI), also known as digital access cross-
connect (DACS), where each DSO time slot of any line can be assigned to any DSO time slot of any line
including itself. The assignment table is called a map. A map contains the DSO time slot assignments of all
time slots for all lines. An idle code is transmitted on all unused time slots. The default DS0 time slot
assignment of all ports is idle channel. When a time slot is assigned to itself, for example A01 to A01,
loopback of that time slot towards the line results.
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