509
02
/3AL 91669 AA AA
674
674
Data Path Port to Access
The ISA–PR port card receives ring traffic over the SDH optical interfaces. The framer, which hosts the
Ring interfaces, recovers and validates the frames and forwards them to ADM
The ADM looks up the network tag (MPLS) makes a decision according to the following criteria:–
• Drop
• Drop & forward
• Forward
• Discard decision.
All frames that are due to be forwarded on the ring are merged with locally generated frames.
All frames that are dropped from the ring are forwarded to the bandwidth management block.
The bandwidth management block buffers the frames till they can be forwarded to the Access cards,
subject to bandwidth availability, congestion conditions and frame priorities.
Control
The ISA–PR port card is managed via the host controller housed on the port card itself.
The control bus can be used to read inventory information such as serial number, construction information
& date of manufacture.
LEDs on the ISA–PR faceplate provide indications as specified in the table below.
Table 54. PR unit LED designation
LED name
State Alarm / Status
OK YELLOW
ON = Minor
Blinking 50/50 = maintenance in progress (loopbacks...)
OK RED
ON = Major/Critical alarms on ISA–PR or Slot alarms in Access
Card or Major transmission alarms on Access Card. Access card
slot alarms stand for: Card Mismatch, Card Unassigned Card
failure on POST (Power On Self Test)
Blinking 50/50 = during the POST (Power On Self Test) failure.
On POST completion the LED will change its color according to
the card status afterwards
Blinking 20/80 = card mismatch
OK GREEN
ON = OK Status
Blinking 50/50 = ISA–PR in initialization process (following
power–on or reset)
OK OFF the card is not powered
Active GREEN ON = the card is powered
Active OFF the card is not powered
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