zhoneAtmTrafficDescrParamExtTrnkVclRate

This field is used to describe the minimum guaranteed rate 
for a VCL which is bound to this traffic descriptor for BAN
ATM Trunk Cards. It is applicable only for RTVBR service 
category. 
Unlike switched voice calls in the TDM world we cannot
oversubscribe bandwidth because all of our voice calls must be
connected at all times so that we can receive signaling to tell
us that the phone when off hook.  Instead of oversubscribing we
suggest that the service provide under provision their voice calls.
An example of this would be a normal good quality voice call over
ATM requires about 80kb of bandwidth.  To share the bandwidth
resource over several customers the service provider would instead
allocate (for example) rate16K for a single voice channel, this
would allow 5 channels to share the bandwidth required to connect
a good quality voice call.  Any value less than rate80K could be
used if the service provider wished to share bandwidth resources
over more than one voice call.  In order for this method to
produce a good quality voice call enough bandwidth must be
unallocated and used in a shared pool by all connections. When the
buffering is not adequate for a good quality call the connection
will not terminate, instead the call quality will suffer.  Values
greater than rate80K would be used by devices like a PBX.
For all service categories other than RTVBR, unused is the only 
valid value.For RTVBR unused is not a valid value and one of the 
rates has to be specified.
This parameter is used independently for transmit and receive traffic
based on the traffic descriptor specified for transmit and receive
in the VCL. Changing this parameter may cause a trap if newly utilized bandwidth 
for a card exceeds its available bandwidth. It may happen on 
multiple cards and therefore there can be multiple traps.

MIB

ZHONE-COM-ATM-MIB

OID

.1.3.6.1.4.1.5504.4.2.2.4.1.1

Type

column

Access

readwrite

Status

current

Parent

zhoneAtmTrafficDescrParamExtEntry

Table

zhoneAtmTrafficDescrParamExtTable

Siblings

2