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Release Notes for Cisco Voice Switch Service Module (VXSM) Release 5.0.02

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Release Notes for Cisco Voice Switch Service Module (VXSM) Release 5.0.02

Table Of Contents

Release Notes for Cisco Voice Switch Service Module (VXSM) Release 5.0.02

Table of Contents

About Release 5.0.02

New Features in Release 5.0.02

Additional VTG/VT to DS1 Mapping Scheme

Introduction

Mapping Schemes

User Interface

Feature Clarifications

Online Diagnostic feature as applied to VXSM.

DSP Resources under Mixed Codec Conditions

Configuring Switching and Trunking Modes

VXSM Management Information Base

Compatibility

Caveats for VXSM Release 5.0.02

Open Caveats in Release 5.0.02

Resolved Caveats in Release 5.0.02

Related Documentation

Obtaining Documentation

Cisco.com

Ordering Documentation

Documentation Feedback

Obtaining Technical Assistance

Cisco TAC Website

Opening a TAC Case

TAC Case Priority Definitions

Obtaining Additional Publications and Information


Release Notes for Cisco Voice Switch Service Module (VXSM) Release 5.0.02


These release notes are part number OL-6224-01 Rev. A0, October 31, 2004.

The Voice Switch Service Module (VXSM) product is supported by the MGX 8880 Media Gateway and the MGX 8850 Multiservice Switch. Refer to these release notes for platform and version level support guidelines.

The VXSM software release notes are supported by the Cisco Voice Switch Services (VXSM) Configuration Guide and Command Reference, Release 5.0.02, which is available on cisco.com.

Table of Contents

About Release 5.0.02

The VXSM 5.0.02 Release follows Release 5.0.00 and is a maintenance release of the VXSM software. This release also introduces one small feature to permit users to use the "M13 Count" method of mapping DS1s to VTG/VGs in OC-3 streams (see "New Features" section in these notes for details).

New Features in Release 5.0.02

Additional VTG/VT to DS1 Mapping Scheme

Introduction

In order to accommodate networks that employs certain types of DACS equipment (Tellabs 5500 DACS), VXSM Release 5.0.02 also supports the Tellabs Titan numbering scheme (also referred to as the M13 count method). Release 5.0.00 only supports the Bellcore Std. TR 253.

With this feature, the user can specify which of the two numbering scheme is to be used.

This feature adds two new CLI commands; one to display the currently selected mapping scheme and one to change the mapping scheme. This feature also adds the appropriate MIB objects and traps.

Mapping Schemes

The SONET-VT1.5/SDH-VC11 payload path type supports 7 VTGs each containing 4 VTs for total of 28 DS1s.

In the ITU-T GR.253 spec, the VTG-VT number pairs are incremented such that the VTG number increments from 1-7 before the VT number is incremented. That is, the first VTG-VT pair is 1-1, the second pair is 2-1, the third pair is 3-1 and so on up to 7-1. The next pair is then 1-2, followed by 2-2, 3-2,4-2 .... 7-2, then 1-3, 2-3...7-3 and so on until finally, 1-4, 2-4, .... 7-4.

In the M13 Count numbering scheme, VTG-VT number pair are incremented such that the VT increments from 1-4, before the VTG is incremented. That is, the first VTG-VT pair is 1-1, the second pair is 1-2, and so on up to 1-4. The next pair is then 2-1, followed by 2-2, 2-3, 2-4, then 3-1, 3-2, 3-3, 3-4 and so on until finally, 7-1, 7-2, 7-3, 7-4.

The complete mapping schemes are shown in Table 1

Table 1 VTG/VT to DS1 Mapping 

DS1
ITU-T GR 253
M13 Count
 
VTG
VT
VTG
VT

1

1

1

1

1

2

2

1

1

2

3

3

1

1

3

4

4

1

1

4

5

5

1

2

1

6

6

1

2

2

7

7

1

2

3

8

1

2

2

4

9

2

2

3

1

10

3

2

3

2

11

4

2

3

3

12

5

2

3

4

13

6

2

4

1

14

7

2

4

2

15

1

3

4

3

16

2

3

4

4

17

3

3

5

1

18

4

3

5

2

19

5

3

5

3

20

6

3

5

4

21

7

3

6

1

22

1

4

6

2

23

2

4

6

3

24

3

4

6

4

25

4

4

7

1

26

5

4

7

2

27

6

4

7

3

28

7

4

7

4


User Interface

CLI

The VTG/VT to DS1 mapping feature adds the following two new CLI commands.

Display VT Mapping

Syntax: dspvtmapping

This command displays the current setting of VTG/VT to DS1 mapping scheme, values are "standard" or "Titan". Standard denotes ITU-T GR 253, Titan denotes M13 Count.

Configure VT Mapping

Syntax: cnfvtmapping <VtMappingMode>

1 - standard (default)

2 - titan

This command switches the current setting of VTG/VT to DS1 mapping scheme to the alternative scheme.


Note To execute the cnfvtmapping command:

1. The cnfvtmapping command is valid on the VXSM-155 card only.
2. All SONET lines on the card must be down.
3. All SONET lines on the card must be configured with medium type as `sonet'.
4. All SONET paths on the card must be configured as `VT1.5'.



Note When VT mapping mode is set to 'titan', the following commands will be affected on the VXSM-OC3 card.

cnfln: the option -slt (Medium Type) will be rejected

cnfpath -sts: the options -payload and -tg will be rejected

In Titan mode, the DS1 path order will be changed in the following commands (see Table 1 for path order).
CLI: dsppaths -ds1
dsppathalms -ds1
dsppathstates (for ds1 only)
dspvif***s (for ds1 only)
dsplapds (for ds1 only)
dspberts -ds1
dspds0xcons (for ds1 only)


Feature Clarifications

Online Diagnostic feature as applied to VXSM.

The online diagnostics feature as implemented on the PXM45 card is supported on VXSM Release 5.0. When enabled, using the PXM45 cnfdiag command, this feature performs non-intrusive diagnostic tests that use four of the VXSM's DSP codecs.

If the user executes the VXSM dspdspcodecpools command, the resulting display shows the four codecs being used (for diagnostics) and subtracts them from the remaining available codecs (see example below).

MGX8850.9.VXSM.a > dspdspcodecpools
=============================================================
                 DSP codec capacity usage
=============================================================

Codec pool	 				Current utilized					Current available
					capacity (#calls)	 				capacity (#calls)
==========					 =================					=================
G711 family 							4 				8060
G729/G726/T.38 family	 						0 				4030

The online diagnostics feature does not reduce the maximum number of 8064 codecs available for calls on the VXSM card. If the number of call requests on the VXSM is sufficiently high, the online diagnostic feature is disabled automatically and the four codecs are made available for active calls.

DSP Resources under Mixed Codec Conditions

When the same codec is used to setup calls on the gateway the available DSP resources will be fully utilized. However when different codecs are used to setup calls the amount of utilizable DSP resources may be limited in certain cases due to fragmentation.

Fragmentation is said to have occurred when the available capacities on two different DSP resources have enough available capacity to support a call of a particular codec type but cannot support that codec type individually.

Consider two DSP resources whose available capacity is 1 unit each making the total available capacity 2 units. However a codec that requires 2 units cannot be supported in the system because the available capacities have been fragmented across the individual DSP resources.

The DSP allocation algorithm on VXSM does make an attempt to smooth the effects of fragmentation but towards the end, fragmentation could happen as the future pattern of calls cannot be predicted beforehand.

Configuring Switching and Trunking Modes

The simultaneous operation of mixed application modes (Switched VoIP applications and Non-switched Trunking applications) is not supported on a VXSM card. However, both modes can be supported in the Media Gateway by using multiple VXSM cards.

VXSM Management Information Base

The VXSM Management Information Base (MIB) Version 5.0.02 is available by request through your Cisco VXSM product marketing representative.

Compatibility


Note VXSM Release 5.0.02 is only supported with PXM-45.


VXSM software interoperability with the Cisco MGX 8850 (PXM45) Multiservice Switch or the MGX 8880 Media Gateway platform software is listed in Table 2.

Table 2 VXSM Software Interoperability 

Product
Latest Firmware
Min. Firmware

PXM45

5.0.00

5.0.00

RPM-XF

12.3(2)T5

12.3(2)T5

CWM

15.0.00

15.0.00

VISM-PR

3.2.11

3.2.10

MGX-AXSM-16-155/B

5.0.00

5.0.00

MGX-AXSM-4-622/B

5.0.00

5.0.00


Table 3 describes the software images available for Release 5.0 for VXSM.

Table 3 Software Images for Release 5.0 for VXSM 

Board Pair
Latest Boot Code Version
Minimum Boot Code Version
Firmware

MGX-VXSM-155

vxsm_005.000.002.200_bt.fw

vxsm_005.000.000.200_bt.fw

vxsm_005.000.002.202.fw

MGX-VXSM-T1E1

vxsm_005.000.002.200_bt.fw

vxsm_005.000.000.200_bt.fw

vxsm_005.000.002.202.fw


Caveats for VXSM Release 5.0.02

This section describes software caveats for Release 5.0.02.

Open Caveats in Release 5.0.02

Table 4 describes the open caveats in VXSM Release 5.0.02.

Table 4 Open Software Caveats for VXSM Release 5.0.02 

DDTS Issue
Description

CSCee88282

Headline: Ecan still ON during hairpin modem calls

Symptom: Modem calls have high transmission error rate.

Conditions: h.248 hairpin modem call

Workaround: None.

Further Problem Description: Ecan should be OFF when modem upspeed occurs.

Ecan is ON. This is shown with dsph248calls command.

CSCef30919

Headline: Standby card failure on performing switchovers




CSCef33806

Headline: Resource Allocation failures after 3 swovers at 70cps

Symptom: Calls fail after multiple switchovers at 70cps and 100s hold time..

Conditions: Switchovers must happen within about 10 minutes of each other. One single switchover will not cause this problem

Workaround: None

CSCef44373

Headline: addcon fails when 2 controllers(PAR,PNNI) are configured on PXM

Symptom: This problem occurs when both controllers, PNNI and PAR are enabled on the shelf and then deleting PAR and then readding it would cause the addcon to fail.

Conditions: The condition is when PAR is added on the PXM and then deleted and readded back on the switch.

Workaround: None

Further Problem Description: Even though PAR is not supported by VXSM card, it is better to identify the problem as what is the interaction between these 2 controllers that is causing VXSM addcon to fail.

CSCef59551

Headline: Call failures at high call rate with announcements

Symptom: At high call rates when announcements are played, some calls will fail with error code 500. (The failure is caused because of a race condition between an announcement stop request and the subtraction of the termination.)

Conditions: This would happen when announcements are played on some terminations. The exact scenario that causes this is still under investigation.

Workaround: None.

CSCin76515

Headline: Few lines go down on VXSM 48T1E1 after VXSM switchover.

Symptom: When vxsm card with 48 T1E1 back card is in 1:1 redundancy configuration and when slot 4 or slot 12 become active during switchover some lines may report alarms.

Conditions: The alarms condition occur only for slot 4 or slot 12 with Redundant back card and also these slot become active due to failover from slot 3 or slot 11 (adjacent slot) redundant pair.

Workaround: None

Further Problem Description:Reconfiguring the certain device register to resolve these alarms

CSCuk52672

Headline: VXSM sends error 430 when receives NULL context audit on busy term





.

Resolved Caveats in Release 5.0.02

Table 5 describes the open caveats that existed in VXSM Release 5.0.00 and are now resolved in Release 5.0.02.

Table 5 Release 5.0.00 Caveats that are resolved in Release 5.0.02 

DDTS Issue
Description

CSCed84520

Bulk delcid/addcid fails intermittently on OC3 card.

CSCed88312

CID alarm not reported for last cid when ds1 is in alarm.

CSCed92138

VXSM reports presence of RCON when there is none installed.

CSCed93276

It takes 1 minute to connect to MGC after MGC switchover.

CSCed93674

VXSM HSS Toolkit Suspend while IP network outage.

CSCed95634

VXSM card comes in Failed state after card reinsertion.

CSCee01411

MCCI memory allocation failure for play tone list inside sequential.

CSCee02176

Race condition in crml when stream_del/res_dealloc flow is changed.

CSCee02614

With Back Card failure APS fails to respond

CSCee02940

With HHM enabled and FDL, subsequent call on DS1 fails.

CSCee03061

Crash when playing SSL over both SCN & PDN terminations

CSCee03737

70 cps memory leak when MGC disconnects.

CSCee05324

Megaco PPC in suspend state with 7K calls and 96 announcements.

CSCee09371

BFG MB console sends out garbage characters during boot up.

CSCee10529

VQ issues with 5.0(0.24)P1 with VAD enabled.

CSCee10536

Calls keep failing after VXSM sw/o during sw upgrade

CSCee11279

Need to disable humvee for standby card.

CSCee13014

After VXSM 4xOC3 reset cids stay in lnAlm but there is none present.

CSCee18475

Backcards come up in mismatch mode.

CSCee23125

After resetsys, one redundant pvc failed.

CSCin70838

TDM HP without DSP crashes the card.

CSCin71355

IL: Tones not passing in HP call after ECAN set OFF, switchback.

CSCin72233

addcon fail with exception err when NULL pointer enable in this image.


.

The MGX-VXSM-155 card is also known as the MGX-VXSM-4OC card.

The MGX-VXSM-T1/E1 card is also known as the MGX-VXSM-48T1/E1 card.

Related Documentation

The following documents contains information that may be useful to software Release 5.0 for VXSM:

Cisco MGX 8850 (PXM1E/PXM45), Cisco MGX 8950, and Cisco MGX 8830 Configuration Guide, Release 5

Cisco MGX Route Processor Module (RPM-XF) Installation and Configuration Guide, Release 4

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