SAM1316-22 User’s Guide
243
C
H A P T E R
3 8
PVC Upstream Limit
This chapter describes how to limit the transmission rate for upstream traffic by
PVC.
Note: You can set this limit for regular PVCs, priority PVCs, TLS PVCs, and IP bridge
PVCs.
These limits are packet-based, not cell-based. If the limit is exceeded, the packet
is discarded the moment it exceeds the limit, regardless of 802.1p priority. The
SAM1316-22 does not check the p-bit of incoming packets from subscribers when
it discards the packet.
These limits are completely managed by the SAM1316-22, regardless of the CPE
device’s settings, which makes this approach more flexible and easier for
operators to deploy.
38.1 PVC Upstream Limit and Upstream VC
Profiles
You can also set limits on the transmission rate for upstream traffic in upstream
VC profiles, but this approach has some limitations.
• It is cell-based. If one ATM cell is lost, you lose one complete Ethernet frame
from the SAM1316-22. In contrast, PVC upstream rate limits are packet-based.
If the limit is 500 Kbps and users inject data at 600 Kbps, you can still get
around 500 Kbps traffic. If you use upstream VC profiles, you might get a much
lower data rate.
• The SAM1316-22 has to work together with the CPE device's ATM output
shaping. If the CPE device does not support this or does not do it accurately, it is
very easy to violate the upstream VC profile and get poor throughput through
the SAM1316-22.
If there are limits on the transmission rate for upstream traffic both in upstream
VC profiles and in this feature, the SAM1316-22 enforces the limit in the upstream
VC profile first.
Summary of Contents for SAM1316-22
Page 2: ......
Page 8: ...SAM1316 22 User s Guide 8...
Page 26: ...SAM1316 22 User s Guide 26 Index 459...
Page 27: ...27 PART I User s Guide...
Page 28: ...28...
Page 32: ...Chapter 1 Getting to Know the SAM1316 22 SAM1316 22 User s Guide 32...
Page 35: ...Chapter 2 Installing and Removing the SAM1316 22 SAM1316 22 User s Guide 35...
Page 36: ...Chapter 2 Installing and Removing the SAM1316 22 SAM1316 22 User s Guide 36...
Page 43: ...43 PART II Technical Reference...
Page 44: ...44...
Page 74: ...Chapter 7 System Information SAM1316 22 User s Guide 74...
Page 122: ...Chapter 14 xDSL Profiles Setup SAM1316 22 User s Guide 122...
Page 128: ...Chapter 15 xDSL Line Data SAM1316 22 User s Guide 128...
Page 152: ...Chapter 18 IGMP SAM1316 22 User s Guide 152...
Page 164: ...Chapter 21 Filtering SAM1316 22 User s Guide 164...
Page 174: ...Chapter 23 Spanning Tree Protocol SAM1316 22 User s Guide 174...
Page 180: ...Chapter 24 Port Authentication SAM1316 22 User s Guide 180...
Page 188: ...Chapter 26 DHCP Relay SAM1316 22 User s Guide 188...
Page 202: ...Chapter 28 2684 Routed Mode SAM1316 22 User s Guide 202...
Page 212: ...Chapter 30 DSCP SAM1316 22 User s Guide 212...
Page 224: ...Chapter 32 ACL SAM1316 22 User s Guide 224...
Page 228: ...Chapter 34 Syslog SAM1316 22 User s Guide 228...
Page 236: ...Chapter 35 Access Control SAM1316 22 User s Guide 236...
Page 242: ...Chapter 37 Maximum MTU Size SAM1316 22 User s Guide 242...
Page 246: ...Chapter 38 PVC Upstream Limit SAM1316 22 User s Guide 246...
Page 260: ...Chapter 41 Alarm SAM1316 22 User s Guide 260...
Page 270: ...Chapter 44 MAC Table SAM1316 22 User s Guide 270...
Page 332: ...Chapter 50 IEEE 802 1Q Tagged VLAN Commands SAM1316 22 User s Guide 332...
Page 356: ...Chapter 52 IGMP Commands SAM1316 22 User s Guide 356...
Page 364: ...Chapter 54 OUI Filter Commands SAM1316 22 User s Guide 364...
Page 368: ...Chapter 55 Packet Filter Commands SAM1316 22 User s Guide 368...
Page 374: ...Chapter 56 IP Commands SAM1316 22 User s Guide 374...
Page 384: ...Chapter 58 SNMP SAM1316 22 User s Guide 384...
Page 428: ...Chapter 60 Virtual Channel Management SAM1316 22 User s Guide 428...
Page 444: ...Chapter 62 Troubleshooting SAM1316 22 User s Guide 444...
Page 454: ...Chapter 63 Specifications SAM1316 22 User s Guide 454...
Page 458: ...SAM1316 22 User s Guide 458...