2.2.6. B Channels 
The following table provides an overview of the number of available
B channels that are dependent on enabled features.
Table 9. Number of B channels dependent on enabled features
|
STMI2
|
NCUI2+
|
STMI4
|
NCUI4
|
STMIX
|
STMIY
|
|||||
|
2 DSP
(Q2316-X)
|
4 DSP
(Q2316-X10)
|
2 DSP
(Q2305-X35)
|
4 DSP
(2305-X40)
|
2 DSP
(Q2324-X500)
|
5 DSP
(Q2324-X511)
|
2 DSP
(Q2324-X)
|
5 DSP
(Q2324-X11)
|
(Q2343)
|
(Q2361)
|
|
|
Standards
|
60
|
120
|
60
|
120
|
60
|
120
|
60
|
120
|
120
|
120
|
|
QDC
|
56
|
112
|
56
|
112
|
60
|
120
|
60
|
120
|
120
|
120
|
|
SRTP
|
45
|
90
|
45
|
90
|
50
|
120
|
50
|
120
|
120
|
120
|
|
QDC+
SRTP
|
42
|
84
|
42
|
84
|
50
|
120
|
50
|
120
|
120
|
120
|
|
DMC
|
45
|
90
|
45
|
90
|
50
|
100
|
50
|
100
|
120
|
120
|
|
QDC+
DMC
|
42
|
84
|
42
|
84
|
50
|
100
|
50
|
100
|
120
|
120
|
|
DMC+
SRTP
|
32
|
63
|
32
|
63
|
40
|
100
|
40
|
100
|
120
|
120
|
|
QDC+
DMC
+SRTP
|
30
|
60
|
30
|
60
|
40
|
100
|
40
|
100
|
120
|
120
|
Important Notes for QDC
QDC is activated on the gateway via WBM and needs additional performance
resources.
QDC is not automatically considered for channel reduction.
Therefore the number of channels has to be adapted manual (depending
on the type of the board) to the values mentioned in the table above
when QDC is activated. If no adaption takes place performance problems
will occur.
Automatic b channel reduction
Using the features for signaling and payload encryption (SPE) and
also DMC, automatic b channel reduction is performed, i.e. the current
values set are reduced by a fixed percentage. This percentage depends
on the hardware used.
IMPORTANT:
The automatic b channel reduction is not performed
with the feature QDC. This b channel reduction has to be done manually
referring to Table 9, “Number of B channels dependent on enabled features”.
This reduction is not only calculated on board level but on function
level. This means that the percentage values from above will be calculated
per configured function.
Examples for single feature support (STMI2/STMI4):
- DMC is activated for HG 3550 on Q2324-X511
-
DMC activated on Q2324-X511: reduction of the b channels of 17% (= minus 20 b channels)=> Maximum number of available b-channels: 120-20=100
- SPE and DMC is activated for HG 3550 on Q2316-X.
-
SPE activated on Q2316-X: reduction of the b channels of 25% (= minus 15 b channels)=> 60-15=45DMC additionally activated on Q2316-X: reduction of the b channels of 25% (of the maximum number of available b channels / depending on the board and/or number of DSPs = minus 15 b channels)=> Maximum number of available b-channels: 45-15=30
Example for multiple feature support (STMI2/STMI4):
- DMC is activated for 2 HG 3550 circuits with 40 b-channels on Q2324-X500. The remaining 20 b-channels are configured for HG 3530.
-
SPE activated on Q2324-X500 for HG 3550: reduction of the b channels of 17% (of 40 b channels = minus 7 b channels )=> Maximum number of available b-channels for HG 3550: 40-7=33The HG 3530 gateway cannot act as DMC endpoint. Therefore the 20 b channels won’t be reduced for HG 3530.
- SPE is activated for 2 HG 3550 circuits with 40 b-channels and HG 3530 for 20 b channels on Q2324-X500.
-
SPE activated on Q2324-X500 for HG 3550: reduction of the b channels of 17% (of 40 b channels = minus 7 b channels)=> Maximum number of available b-channels for HG 3550: 40-7=33SPE activated on Q2324-X500 for HG 3530: reduction of the b channels of 17% (of 20 b channels = minus 3 b channels)=> Maximum number of available b-channels for HG 3530: 20-3=17These reduced b-channel values are the upper limit for path selection.The B channel number increases appropriately when features are deactivated.Summary:In the AMO BFDAT, only the maximum number of B channels can be configured. Using the AMO BCSU, the number of currently available B channels can be displayed and the B channels configured.The following tables provide an overview of the number of available B channels that are dependent on enabled features.