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Telindus 1031 Router
Chapter 6
User manual
Configuring the WAN encapsulation protocols
91
6.4.4
Configuring the PCR
The Peak Cell Rate (PCR) is comparable to the EIR in Frame Relay (refer to
In other words, it is the specified amount of unguaranteed bandwidth (measured in bits per second) on
an ATM service. Refer to the
below to see how to set a guaranteed bandwidth.
The major difference between the PCR mechanism on ATM and the CIR/EIR mechanism on Frame
Relay (refer to
6.3.5 - Configuring CIR and EIR
) is that in case of ATM the bandwidth
assigned to each PVC is recalculated at regular intervals. This means that depending on the traffic on
the PVCs, the Telindus 1031 Router can (proportionally) divide the bandwidth over the different PVCs.
As a result, over-dimensioning the PCR on ATM is not as fatal as over-dimensioning the CIR on Frame
Relay. The following examples will clarify this.
To configure the PCR, use the
element in the
atm
structure within the
pvcTable
. Refer to
telindus1031/g703[ ]/channel[ ]/atm/pvcTable/atm
.
Important remarks
• Per definition, the PCR is the specified amount of unguaranteed bandwidth. However, if you want to
set a guaranteed bandwidth, then …
- do not over-dimension the PCR (i.e. do not let the sum of the PCRs of the PVCs exceed the band-
width of the physical connection).
- do not set the PCR to auto.
• When you do exceed the total bandwidth of the physical connection, then the Telindus 1031 Router
first buffers the data. However, when the buffers of the Telindus 1031 Router are completely filled up,
it has to discard the “excess” data.
Examples
Suppose you have a 2
Mbps physical connection
towards the ATM service
provider and you define 4
PVCs:
The following tables show
some possible scenarios.
Scenario:
⇒
Because all PCRs are set to auto, each PVC tries to get a maximum bandwidth. Hence, the total
available bandwidth (2 Mbps) is divided equally over the four PVCs.
Configured PCR
Amount of data sent
Assigned bandwidth
PVC 1
auto
2048 kbps
512 kbps
PVC 2
auto
2048 kbps
512 kbps
PVC 3
auto
2048 kbps
512 kbps
PVC 4
auto
2048 kbps
512 kbps
ATM
network
LAN
2 Mbps connection
PVC 1
PVC 2
PVC 3
PVC 4
Summary of Contents for 1031
Page 11: ...Telindus 1031 Router User manual 1 User manual ...
Page 12: ...Telindus 1031 Router User manual 2 ...
Page 80: ...Telindus 1031 Router Chapter 5 User manual Basic configuration 70 ...
Page 168: ...Telindus 1031 Router Chapter 8 User manual Configuring the bridge 158 ...
Page 179: ...Telindus 1031 Router Reference manual 169 Reference manual ...
Page 180: ...Telindus 1031 Router Reference manual 170 ...
Page 308: ...Telindus 1031 Router Chapter 11 Reference manual Status attributes 298 ...
Page 336: ...Telindus 1031 Router Chapter 12 Reference manual Performance attributes 326 ...
Page 348: ...Telindus 1031 Router Chapter 13 Reference manual Alarm attributes 338 ...
Page 362: ...Telindus 1031 Router Chapter 15 Reference manual Auto installing the Telindus 1031 Router 352 ...
Page 370: ...Telindus 1031 Router Chapter 16 Reference manual Downloading software 360 ...
Page 380: ...Telindus 1031 Router Chapter 17 Reference manual Technical specifications 370 ...
Page 381: ...Telindus 1031 Router Annex 371 Annex ...
Page 382: ...Telindus 1031 Router Annex 372 ...
Page 384: ...Telindus 1031 Router Annex A Annex common TCP and UDP numbers 374 ...
Page 386: ...Telindus 1031 Router Annex B Annex product information 376 ...