Table Of Contents
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
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.
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
The VTG/VT to DS1 mapping feature adds the following two new CLI commands.
Display VT Mapping
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
dsppathstates (for ds1 only)
dspvif***s (for ds1 only)
dsplapds (for ds1 only)
dspds0xcons (for ds1 only)
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 availablecapacity (#calls) capacity (#calls)========== ================= =================G711 family 4 8060G729/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.
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
Table 3 describes the software images available for Release 5.0 for VXSM.
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.
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.
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.
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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