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Main / Changeovers (video, audio, SDI) / PCOV-7326
| PCOV-7326 series HDSDI/SDI/ASI changeover |
PROFLEX™ PCOV-7326 series HDSDI/SDI/ASI changeovers protect (HD)SDI/ASI transmission line.
The automatic and manual changeover action is performed by a latching relay.
Changeover criterios:
- input signal loss
- EDH/CRC errors
- SMPTE sync word errors (ASI only)
- user-selectable combination of the above criterios
model index |
rack slots occupied |
number of protected lines |
PCOV-7326 |
1 |
1 |
PCOV-7326-1 |
2 |
3 |
PCOV-7326-2 |
2 |
3 |
Features:
- automatic and manual changeover control
- automatic standard detection
- input signal present/lost indication
- EDH status indication
- presettable switch delay
- automatic or manual change-back modes
- monitor output for MAIN and STANDBY lines
- PAL/NTSC monitor option for SDI input signal
- Rec.RP-168 compliant switch timing on monitor output
- monitor output independent control
- "monitor follows program output" capability
- "monitor follows stand-by input" capability
- latching relay on main output, EE by-pass on monitor output
- GPI inputs and outputs
- two auxiliary switchers of unbalanced signals (PCOV-7326-1)
- two auxiliary switchers of balanced audio or AES/EBU signals (PCOV-7326-2)
Technical specifications
- Inputs:
| main lines |
two HDSDI/SDI/ASI inputs |
| standard compliance |
SMPTE 292M (HDSDI), SMPTE 259M A,B,C,D (SDI), DVB-ASI |
| auxiliary lines (PCOV-7326-1 and PCOV-7326-2 only) |
two inputs in each line |
| connector type |
BNC |
| GPI inputs |
MAIN/STDBY/AUTO main output mode control, MON MAIN/MON STDBY monitor output mode control |
- Outputs
| main line |
one output, BNC |
| auxiliary lines (PCOV-7326-1) |
one output in each line, BNC, unbalanced inputs/outputs |
| auxiliary lines (PCOV-7326-2) |
one output in each line, DB-25, balanced inputs/outputs |
| monitor |
one output, BNC, optional PAL standard for SDI input |
| GPI outputs |
slave device control (MAIN/STDBY), dryreed relay |
| maximum GPI load |
0.8A/125V AC/110V DC |
- line parameters
| main line |
return loss |
better than 10dB at 1.5GHz |
| maximum cable length (input AND output legs) |
100m |
| relay type |
high frequency latching relay |
| auxiliary line (PCOV-7326-1/2) |
return loss |
better than 40dB at 5MHz |
| relay type |
latching relay |
- monitor output parameters
- digital mode
| output signal standard |
as per input standard |
| number of outputs |
one, reclocked |
| return loss |
better than 12dB at 1.5GHz |
| signal amplitude |
800mV±10% |
| connector type |
BNC |
| signal rise and fall time |
270ps (HD SDI), 700ps (SD SDI) |
| jitter |
less than 0.2 UI |
- PAL/NTSC mode (SD SDI input only)
| number of outputs |
one |
| output impedance |
75 Ohm |
| signal amplitude |
1000mV at 75 Ohm |
| diff phase and diff gain |
less than 3% |
| frequency response ripple |
less than 2% up to 5.5MHz |
| connector type |
BNC |
General description
The MAIN and the STDBY input signals are applied to the latching relay and to the automatic cable equalizers. Normalized and reclocked signals are analysed in the SDI/ASI processor to detect transmission errors and make the changeover decision.
The MON output provides either input line for monitoring in user-selectable form: as at the input or encoded into PAL/NTSC (in case of SDI input standard).
PCOV-7326-1 simplified schematic
PCOV-7326-2 simplified schematic
PCOV-7326 rear panels
Changeover algorithm
When any of criterios are met (input signal loss, EDH errors, SMPTE sync word errors (ASI only) the user-presettable changeover delay interval timer is started (0,1~9,9 sec). If condition reappears within this interval - the changeover takes place instantly.
Note: The longer the interval the higher the probability of repetitive errors and, therefore, the changeover action. However, if the standby line also has errors - no changeover action will take place no matter the errors in the main signal.
In the PCOV-7326-1 and PCOV-7326-2 models the auxiliary channels are switched along with the main one.
GPI control capabilities
- local GPI
By grounding a relevant contact it is possible to activate the following modes:
- PRG GPI input contact group:
- PRG AUTO IN - enables the automatic changeover on an input signal error(s) condition
- PRG MAIN IN - selects the MAIN input for the output
- PRG STANDBY IN - selects the STANDBY input for the output
- MON GPI input contact group:
- MON MAIN IN - selects the MAIN input for the monitor output
- MON STANDBY IN - selects the STANDBY input for the output
- GPI OUTPUT contact group:
- MAIN OUT - grounded when the MAIN input is selected for the output
- STANDBY OUT - grounded when the STANDBY input is selected for the output
External indicators implementation example.
Local control
All local means of control and indication are located on the frontal panel of the PCOV-7326 module.
Controls
The MODE button toggles through all the modes, the UP and DOWN buttons edit them. The MAIN button selects the main line, the STBY - the backup one, a simultaneous depression of the MAIN and STBY buttons enables the automatic line selection mode.
Indicators
- IN USE MAIN – lit when the main input is selected for the output
- IN USE STBY – lit when the stand-by input is selected for the output
- IN USE AUTO – lit when automatic selection mode is enabled
- LOSS MAIN/STBY – lit when main or stand-by input signal is lost
- EDH MIN MAIN/STBY – lit when an EDH error was detected during the last minute interval in respective channel
- EDH DET MAIN/STBY – lit when EDH packets are detected in respective channel
- INP MAIN/STBY – lit when an input signal is detected in respective channel
When under the GPI control (PRG AUTO IN, PRG MAIN IN, PRG STANDBY IN), the relevant buttons are locked-out and indicators blink.PCOV-7326 configuration
- Input standard selection
Toggle the MODE button until the INP STD lits, use the UD/DOWN buttons to select:
- SdI - the SDI standard is selected
- ASI - the ASI standard is selected
- automatic standard detection:
- ASd - the SDI is autodetected
- AAS - the ASI is autodetected
- MONITOR output control mode selection
Toggle the MODE button until the MONITOR MODE lits, use the UD/DOWN buttons to select:
- nFL - independent mode
- FL - the "follow" mode, the MONITOR output follows the main output
- FLI - the "inverted" "follow" mode, MONITOR output follows the back-up input
- MONITOR output channel selection
Toggle the MODE button until the MONITOR SEL lits:
- independent mode, use the UD/DOWN buttons to select a channel:
- A - the MAIN channel is selected
- b - the STANDBY channel is selected
- "follow" and "inverted follow" mode:
- F-A - the MAIN channel is selected
- F-b - the STANDBY channel is selected
- changeover mode selection
Toggle the MODE button until the SWITCH MODE lits, use the UD/DOWN buttons to select:
- FF - "flip-flop", automatic changeback on main input signal restoration
- FO - "flip once", automatic changeback mode disabled
- changeover delay selection
Toggle the MODE button until the SWITCH DEL lits, use the UD/DOWN buttons to preset the delay time
- EDH status reset
Hold the MODE button pressed for 3sec, the EDH indicators go out, the error counters are reset
The remote control and management from a PC
All the “PROFLEX” modules are remote controllable from a PC. This facility is available if a rack is fitted with a CPU module (ordered separately). |
