Page 61 - Eurotek Catalogue

BOARD PLUG-IN ek-asw/6

“ASI SWITCH HITLESS”

The EK-ASW/6 board is an ASI Switch (see EK-ASW/6

block scheme) that can commutate between a maximum
of six transport stream inputs into two outputs. The
board can works in automatic mode or manual mode. In
“automatic mode” the system analyzes the input
transport streams and decide which data flow must be Features
sent to the transport stream outputs according with the
 4+2 different ASI input
status on the selected transport stream input  Automatic or manual mode
and input priority. If the Alignment Src option is
enabled the system switch between inputs that are  Delay balance
previously aligned from digital delay lines. This permits  Hitless switch
to have an hitless switch also when there is a delay  Bypass output mode
between inputs up to 16 packets. In order to use the  Complete web
management
Alignment Src option it is necessary to have inputs with
the same transport stream. Moreover in Automatic
mode and Alignment Src the system is able to works
like a diversity receiver since it analyses the Transport Applications
Stream Error Indicator bit to switch, this bit is managed
by the EK-UNM/2 and EK-UNM/3 modems and  1+1 Redundancy System
 Digital Microwave Links
indicates if a packet is currupt or not. In “manual mode”
user’s selects which transport stream must be sent to the
outputs and switch in a packet by packet manner. A
particular hardware permits during a faults, or when the
board isn’t powered up, to carry out the transport stream
present on the ASI 1 input to the ASI OUT M output

(bypass mode). Output transport stream is present on
the ASI OUT S connector only if the board is powered
up. Finally, an alarm section allows to control the status
on the input ASI transport stream selected.