Quantum and Evolution Series Installation and Operating Handbook
6-15
Alarms and AGC Connector
This is a 15-pin male 'D' type connector that provides access to the four form `C' relay
contacts that indicate alarm conditions. There is also an AGC output.
The alarm relays have the following default definitions:
Unit Fault
:
A unit fault exists, i.e. an equipment failure.
Tx Traffic Prompt
: Tx traffic fault exists.
Rx Traffic Prompt
: Rx traffic fault exists.
Deferred Alarm
:
One of the following conditions exists:
•
The receive BER is greater than the user defined threshold.
•
The receive Eb/No is lower than the user defined threshold.
•
Buffer slips are more frequent than the user set threshold.
•
A backward alarm is being received from either the satellite or
terrestrial ports.
Async ESC Connector
This is a 15-pin `D` female connector. When the IDR option is
not
fitted, it provides an
RS232/RS422/RS485 asynchronous port for either the high rate Async ESC facility (for
IBS/SMS or Closed Net Plus ESC services) or the IBS/SMS `low rate Intelsat oversampled
ESC facility` (which is configured as the Aux data channel on the modem). When the IDR
option is fitted, separate ports for the ESC and Aux channels on the IDR card are activated
and ESC/Aux access on this async connector is disabled. This connector also provides
the input port for an RS422-compatible Station Clock.
On-line LED
This LED mirrors the front panel Tx Carrier LED, so that from the rear of the equipment the
operator can tell if the carrier is off and which unit of a 1:1 pair is the offline unit.
Terrestrial Interface Connectors
There are two terrestrial interface connector positions. Supported interface cards include
EIA530, LVDS, balanced G.703 (unbalanced G.703 is provided via a third interface
position), HSSI, Quad E1, IP Traffic and Eurocom D1.
The IDR option is fitted in the upper interface position with the terrestrial interface in the
lower position.
If the G.703 option is fitted, then balanced G.703 supporting T1, E1, T2, E2, T3 and E3
modes is available. Balanced-operation T1(1544kbps, 100
Ω
), E1 (2048kbps, 120
Ω
) and
T2 (6136kbps, 110
Ω
) is provided on the EIA530 `D` type connector when G.703 is selected
in addition to RS422, V.35 and RS232 EIA530 modes. Unbalanced-operation E1
(2048kbps, 75
Ω
), T2 (6136kbps, 75
Ω
), E3 (34376kbps, 75
Ω
) and T3 (44376kbps, 75
Ω
)
requires the use of the two BNC connectors in interface position 3. The line impedance and
all other parameters are selected via software. The software also selects what happens to
the G.703 port when power is removed. Either the G.703 ports can be set to go high
impedance (used in 1:1 redundancy operation) or they can be configured to loop the G.703
