RS8234 Mindspeed Technologies, RS8234 Datasheet - Page 69
RS8234
Manufacturer Part Number
RS8234
Description
Atm Servicesar Plus With Xbr Traffic Management
Manufacturer
Mindspeed Technologies
Datasheet
1.RS8234.pdf
(401 pages)
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RS8234
ATM ServiceSAR Plus with xBR Traffic Management
3.2.2 Resource Allocation
3.2.3 Resource Isolation
28234-DSH-001-B
APPLICATION EXAMPLE
A system designer implements a RS8234 terminal as an ATM uplink for a
Service Access Multiplexer (SAM). The SAM is comprised of the ATM card and
several Frame Relay adapter cards. The host assigns each Frame Relay adapter
card to a set of RS8234 control and status queues at initialization. During opera
tion, one of the Frame Relay adapter cards experiences a hardware failure. The
failure prevents the card’s processor from servicing the RS8234’s reassembly status
queue. Eventually, the RS8234 fills the queue and is unable to proceed — this situa-
tion is referred to as queue overflow. The RS8234 shuts down reassembly on VCCs
that are assigned to the overflowed queue only. Since the other cards in the
system are assigned to other status queues, their VCCs remain unaffected by the
failure.
With either physical PCI peers, logical peers, or some combination of the two
types, the RS8234 multiplexes each peer’s transmitted packets onto the line and
routes incoming packets to the appropriate peer. The host system allocates shared
resources, such as host and SAR shared memory, VPI/VCI address space, and
CBR time slots, to peers and clients arbitrarily.
Since each peer is assigned to an independent control and status path, the RS8234
isolates the resources of each peer. Not only does this simplify resource
management, but queue error conditions caused by a single peer do not affect any
other peers.
Mindspeed Technologies
™
3.2 Multiple Client Architecture
3.0 Host Interface
3-3
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