Specifications

Chapter 1 Introduction Installation and Operation Manual
1-4 Overview ASMi-31 Ver. 3.0
If the detected clock is not valid, the modem displays the alarm and sends a
message to the remote unit. The modem continues to look for the valid clock
rate as long as it is in the EXT RCV mode.
4. Activation state: if the clock rate is detected as valid, ASMi-31 displays the
data rate in the DTE Status screen on the LCD and sets the remote unit to
the detected rate.
5. Steady state: the DTE interfaces are enabled after a delay for clock system
stabilization. Data and control signals are received and transmitted to the
external source. At the same time ASMi-31continues to verify the clock rate
(step 2) and if no errors found, remains in the Steady state.
If an illegal clock is received while the modem is in the clock detection process
(steps 2 to 5), it may cause a loss of the current status and the modem and
remote unit begin to exchange error messages.
Control Signal Transfers
ASMi-31 supports end-to-end transfer of two control signals: DTR to DSR and
RTS to DCD, except for the V.35 interface, which does not support the DTR to
DSR signal.
Remote Management
A management channel transmitted inband over the D-channel allows
simultaneous remote configuration for both local and remote modems, real-time
alerts on failures, diagnostic testing, and statistical information on system
performance.
The operator manages both local and remote modems by accessing the front
panel LCD and buttons. Both data and management are transmitted
simultaneously inband without interference.
The configuration parameters are stored in non-volatile memory.
Diagnostics
ASMi-31 contains a built-in internal BERT in async and sync mode for complete
testing of the local and remote modems and data link quality, with no need for
external testing equipment.
V.54 diagnostic loopbacks:
• Local analog loopback
• Remote digital loopback
The loopbacks may be activated for both the local and the remote units, by either
LCD front panel switches, or through the DTE interface assigned pins.
Loopback activation from the DTE is not supported by the X.21, G.703
Codirectional or Ethernet interfaces.
Real time alarms provide real time status information on the system’s condition.
Alerts exist to indicate faulty conditions such as:
Note