6
Loopback (DIP Switch S1, Position 1)
This switch enables or disables the loopback feature. When this feature is enabled,
the data line (Coax or Fiber) set by the “Loopback Type” DIP Switch is looped back.
By default this feature is
DISABLED
.
This feature can be controlled by SNMP management software (iView
2
) when the
iMcV-DS3/E3/STS-LineTerm module, configured as a HOST, is installed in a managed
chassis.
Loopback Type (DIP Switch S1, Position 2)
This switch identifies which data line is looped back when the Loopback DIP Switch
is enabled. The data line loopback selection can specify either a Fiber Loopback or a
Coax Loopback.
By default this feature is
COAX
.
This feature can be controlled by SNMP management software (iView
2
) when the
HOST iMcV-DS3/E3/STS-LineTerm module is installed in a managed chassis.
Fault Loopback (DIP Switch S1, Position 4)
This switch enables or disables the Fault Loopback feature. A normal fault Loss Of
Signal (LOS) will cause an Alarm Indication Signal (AIS) to be sent on to the next line
segment. This feature provides for a fault condition to be sent back towards the
direction of the detected fault. In this way, both upstream and downstream craft
personnel are alerted to a single fault.
The Fault Loopback feature uses the iMcV-DS3/E3/STS-LineTerm module LEDs to
indicate that a loss of one strand of fiber has occurred. When a strand becomes
unavailable, the module at the receiver-end detects the LOS of the fiber link and
lights the LOS LED. The module then responds by sending a Remote Alarm
Indication (RAI) signal back to the Fiber line turning ON the RAI LED at the far end of
the line and sending AIS to the COAX Port. The RAI LED is now ON at the source of
the Fiber fault. By using the Fault Loopback Function, a local site administrator can
quickly determine where a fiber fault is located from either end of the fiber line.
The AIS is transmitted as an M13 framed all-ones signal for DS3. For E3/STS and STS,
the AIS signal is an unframed all-ones pattern.
By default this feature is
ENABLED
.
This feature can be controlled by SNMP management software (iView
2
) when the
HOST iMcV-DS3/E3/STS-LineTerm module is installed in a managed chassis.
7
Transmit LIU Waveshape (Line Build-Out) (DIP Switch S1, Position 5)
This switch selects the optimal transmit waveshape for the line build-out distance on
the coax line. The transmit waveshape can be set for a distance of either 0 to 255
feet or over 255 feet. This feature corrects problems related to cabling (i.e., cross-
talk, electromagnetic interference, etc). Improperly setting this switch will cause
signal degradation.
By default this feature is set to
0 to 255 feet
(450 ft maximum).
Transmit Coax Data Source (DIP Switch S1, Positions 6 & 7)
These switches select the transmit mode used by the iMcV-DS3/E3/STS-LineTerm
module. The transmit modes that can be selected include the following:
Standard data
Unframed All Ones (diagnostic)
Alternating Ones and Zeros (diagnostic)
Pseudorandom Bit Sequence (diagnostic 2
15
-1 PRBS Pattern)
These standard Telco transmission pattern modes are provided to help diagnose
transmission errors in the line.
By default this feature is set to
STANDARD DATA
.
This feature can be controlled by SNMP-management software (iView
2
) when the
HOST iMcV-DS3/E3/STS-LineTerm module is installed in a managed chassis.
DS3, E3/STS and STS Selection (DIP Switch S1, Position 8)
This switch selects the data rate to use on the coax line. The data rate selections
available include the following:
DS3
(44.736 Mbps +/- 20 ppm)
E3/STS
(34.368 Mbps +/- 20 ppm)
STS
(51.840 Mbps +/- 20 ppm)
By default this feature is set to
DS3.
This feature can be selected only by setting the DIP Switches manually.
Remote Management (DIP Switch S1, Position 10)
This switch enables or disables the Remote Management mode. Enabling Remote
Management on the Remote module allows all SNMP configurable features for the
Remote modules to be configured from the Host module. By default this feature is
