Lucent Technologies CBX 3500 User Manual

Beta Draft Confidential
About ATM Logical Ports
About Logical Port Bandwidth
ATM Services Configuration Guide for CBX 3500, CBX 500, GX 550, and B-STDX 9000 1/19/052-17
In some cases, due to the way the switch stores logical port bandwidth, the NMS may
have to round down non-integer maximum logical port bandwidth values to the
nearest Kbps value.
Table 2-5. Physical and Logical Port Bandwidth Conversions
Physical Port
Media Type
Physical
Port
Bandwidth
(Kbps)
Exact
Logical
Port
Bandwidth
(Kbps)
Exact
Logical
Port
Bandwidth
(cps)
NMS
Rounded
Maximum
Logical
Port
Bandwidth
(Kbps)
NMS
Rounded
Maximum
Logical
Port
Bandwidth
(cps)
OC-12c/STM-4 622080 599040 1412830.19 599040 1412830
OC-3c/STM-1 155520 149760 353207.55 149760 353207
OC-48c/STM-16 2488320 2396160 5651320.76 2396160 5651320
ATM DS3 (with
Physical Layer
Convergence
Protocol
[PLCP])
44736 40704 96000 40704 96000
ATM DS3 (with
header check
sequence [HCS]
direct mapping)
44736 44209.694 104268.15 44209 104266
ATM E3 (with
HCS direct
mapping)
34368 33920 80000 33920 80000
ATM E3 (with
G.751 PLCP)
34368 30528 72000 30528 72000
T1 1544 1536 3622.64 1536 3622
E1 2048 1920 4528.3 1920 4528
Note – For most applications, rounding down non-integer maximum logical port
bandwidth does not cause any problems. However, if you need to run 100% line rate
traffic through a policed PVC where you have rounded values, policing may cause
minor cell loss.

Lucent Technologies CBX 3500 Specifications

General

Brand	Lucent Technologies
Model	CBX 3500
Category	Switch
Language	English