Beta Draft Confidential
Configuring ATM Logical Ports on Frame-based Modules
Logical Port Congestion Thresholds
ATM Services Configuration Guide for CBX 3500, CBX 500, GX 550, and B-STDX 9000 1/19/054-9
Logical Port Congestion Thresholds
Logical port maximum and default congestion threshold values vary depending on the
type of service class configured for the logical port. You can configure congestion
thresholds for both mono-class and Priority Frame QoS multi-class variable frame
rate-non-real time (VFR-NRT) services. See “Priority Frame Attributes” on page 4-34
for information about configuring mono- and multi-class services.
Table 4-2 shows the maximum mono-class service threshold values you can configure
for each frame-based and ATM-based module that supports ATM services.
Table 4-3 shows the maximum multi-class service threshold values you can configure
for each frame-based and ATM-based module that supports ATM services.
Table 4-2. Maximum Mono-Class Service Thresholds per Card Type
Card Type 56-Byte Buffers Bytes
8-Port UIO 5450 305200
10-Port DSX 4668 261408
4-Port Unchannelized T1 5408 302848
4-Port Unchannelized E1 5408 302848
12-Port Unchannelized E1 1922 107632
2-Port HSSI 23632 1323392
1-Port ATM UNI 60799 3404744
Table 4-3. Maximum Multi-Class Service Thresholds per
Card Type
Card Type 56-Byte Buffers Bytes
8-Port UIO
2800 (if port speed is <
or = 2048 Kbps)
156800
5600 (if port speed is >
2048 and < or = 4096
Kbps)
313600
11200 (if port speed is
> 4096 and < or = 8192
Kbps)
627200
10-Port DSX 2080 116480
4-Port Unchannelized T1 1600 89600
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