Table Of Contents
Release Notes for Cisco WAN MGX 8850
Release 1, MGX 8230, and MGX 8250 Software Version 1.2.00Features Introduced in Release 1.2.00
ITU APS Annex-A, All Configurations Supported on PXM1
VISM Release 2.2 on MGX 8250, MGX 8850 Release 1, and MGX8230 Switches
Features Not Supported in This Release
MGX 8220 Hardware That Has Been Superseded by MGX 8850-Specific Hardware
Service Module Redundancy Support
Loopback Plug on a HSSI:DTE Interface
ForeSight and Standard ABR Coexistence Guidelines
CLI Modifications in 1.2.00 Baseline
RPM Front Card Resets on the Back Card Removal
RPM-PR Back Ethernet Card Support
MGX-RPM-128M/B Ethernet Back Card Support
CWM Recognition of RPM-PR and MGX-RPM-128M/B Back Cards
Problems Fixed in Release 1.2.00
Known Anomalies for Platform Software Release 1.2.00 and Service Module Firmware
MGX 8230/8250/8850 Software Interoperability with Other Products
VISM and RPM Firmware Compatibility
MGX 8250/8850 Firmware Compatibility
MGX 8230 Firmware Compatibility
Special Installation and Upgrade Requirements
Special Instructions for Networks Containing FRSM 2 CT3
Single PXM Installation Procedure
Installation Procedure for Redundant PXMs
Instructions to Abort PXM Upgrade
Service Module Boot/Firmware Download Procedure
Manual Configuration of Chassis Identification
Chassis Identification During a Firmware Upgrade
Interoperability of Service Module on MGX 8220 and MGX 8250 Switches
Route Processor Module (RPM) Addendum
About the CISCO IOS 12.2(4)T1 Release
About the Cisco IOS 12.2(4)T Release
About the Cisco IOS 12.2(2)T2 and 12.2(2)T3 Release
About the Cisco IOS 12.1(5.3)T_XT Release
Problems Fixed with IOS 12.1(5.3)T_XT
Bypass Feature for RPM in 12.2(4)T IOS Release
Upgrading from an MGX-RPM-128M/B Card to an RPM-PR Card
Upgrading Non-redundant RPM-PR Cards
Obtaining Technical Assistance
Release Notes for Cisco WAN MGX 8850
Release 1, MGX 8230, and MGX 8250 Software Version 1.2.00
Contents
Features Introduced in Release 1.2.00
Release 1.2.00 is a feature release. The following table contains a short description of the features which are available with Release 1.2.00.
FRSM-HS2/B. In addition to the current HSSI interface support, the new service module supports V.35 and X.21 Frame Relay interfaces.
SRM-E Service Redundancy Module is an enhanced version of the current SRM-3T3 card, supporting a new one-port OC3/STM1 back card. The new card supports BERT, 1:N redundancy for the 8 port service modules and both T1 and E1 bulk distribution for the 8 port service modules. APS support will be available in a future release.
ITU APS Annex-A, All Configurations Supported on PXM1. This feature was introduced in Release 1.1.40 with some configurations supported; now all are supported. Compatible with CWM 10.5 and higher.
CESM 8T1 Model B eliminates problem in DS0 throughput reduction when CESM channels are configured in CAS mode (not applicable for E1 lines).
PXM-UI-S3, provides support for Stratum-3 clocking. This card was first supported in Release 1.1.31. Release 1.1.31 was compatible with CWM 10.3. The upgrade to Release 1.2.00 provides important fixes to this feature.
FRSM-HS2/B
The FRSM-HS2/B service module supports v.35 and x.21 frame relay interfaces in addition to the current HSSI interface. A new 8 port back card 12IN1-8S is introduced. The new front card supports the current HSSI back card and the new 12IN1-8S back card. All the current FRSM-HS2 features are supported in addition to the FRSM-HS1/B features. Each interface in the 12IN1-8S can be individually configured as x.21 or v.35 interface. The new service module supports a maximum of 4000 connections with the 12IN1-8S back card and 2000 connections with the HSSI back card when no LMI is configured. When LMI is configured, the maximum number of connections per port for strataLMI port is 560 and Annex A/D UNI/NNI port is 898.
The FRSM-HS2/B supports both DCE and DTE modes with line rates between 48Kbps to 51.84 Mbps for HSSI interface and 48Kbps to 8.192 Mbps for v.35/x.21 interface. In FRSM-HS2B, for DTE interfaces the clock frequency threshold %ge is introduced and is configurable (1 - 5) % with a default value of 3%. The new front card and back card is supported in CWM 10.5.10.
Warning
Do not configure an interface to a DTE mode when a physical loopback plug is plugged in. This will cause the line to go in and out of alarm, and cause software errors in the PXM. Use the command cnfln to configure the line as DCE to recover from this situtation. For further information refer to bug CSCdv79470.
A comparison of the FRSM-HS1/B, FRSM-HS2, and FRSM-HS2/B is shown in Table 1.
Table 2 CLI New or Modified Commands
addln
Existing addln command is modified to support per line interface type configuration (used only with the 12IN1-8S). If the user doesn't specify <interface_type>, the default type V.35 is used.
cnfln
Existing cnfln command is modified on FRSM-HS2/B to support new MIB objects.
Note
cnfclktype
Existing cnfclktype command is added to FRSM-HS2B to configure line clock type for V.35/X.21 interfaces. This command is valid on the FRSM-HS2B-12IN1 card.
dspln
Existing dspln command is modified on FRSM-HS2/HS2B to display new objects.
dsplns
Existing dsplns command is modified on FRSM-HS2/HS2B to display interface type.
The following table lists the cables necessary for card performance.
SRM-E
The new Service Redundancy Module is an enhanced version of the current SRM-3T3 card. The new card supports a one-port OC3/STM1 back card or functions without a back card.
BERT
Bulk Distribution
1:N redundancy
BERT
--
1:N redundancy
The new card supports BERT, 1:N redundancy for the 8 port service modules and both T1 and E1 bulk distribution for the 8 port service modules. Support for both GR-253 and ITU- Annex A and B APS 1+1 will be provided in a future release.
The new front card will function without the back card for BERT and 1:N redundancy features. CWM and CiscoView will support the new front and back card.
You can have either 0, 2 or 4 SRM's with redundant processors and 0, 1 or 2 with non-redundant processors. The MGX8250 or MGX 8850 shelf has two bays while the MGX8230 has only one bay. Each bay of the MGX8x50 requires its own SRM-E card along with its respective back card. For full redundancy for the shelf, you need 4 SRM-Es and their respective back cards for MGX8850 or MGX 8250 switch (2 SRM-Es for MGX8230). Since the SRM-E is part of the core card set, if redundancy is required for the PXM, then redundancy also should be provided for the SRM-E.
SRM-E cards do not require any firmware to be downloaded to them. They are controlled by platform software running on the PXM. When a switch-over occurs from active PXM to standby PXM, the corresponding SRM-E cards (as part of the core card set) will also switch.
The interfaces available (through the appropriate back cards below) are:
· OC3 optical
· STS3 electrical
· STM1 optical
· STM1 electrical
The following cards are supported on both MGX8850 or MGX 8250 switch and the MGX8230 switch.SMFIR: Single Mode Intermediate Range Fiber
STM1-EL-1: Synchronous Transport Module level 1
ITU APS Annex-A, All Configurations Supported on PXM1
In the previous MGX1 release (1.1.40), limited ITU-APS Annex-A configuration was validated and made available in MGX 8230, 8250 and 8850 with support for a 1+1 bidirectional non-revertive configuration. In Release 1.2.00, the remaining configurations are supported.
CESM 8T1 Model B
CESM-8T1 and CESM-8E1 cards provide TDM circuit emulation capabilities over ATM networks, according to ATM forum CES-IS standards.
During field testing, it was found that in the case of CESM-8T1 cards (and not applicable for CESM-8E1 cards), when a CESM channel was configured in CAS mode, the first byte of an AAL1 structure may not be aligned to the first byte of T1 physical level multiframe (SF/ESF). This causes the effective DS0 throughput to reduce from 62.67 Kbps to 60 Kbps. This throughput reduction causes bit errors when the CESM-8T1 is used in certain kind of applications; for example, during transfers of modem calls.
Both hardware and firmware changes were required to eliminate this anomaly. The hardware changes are implemented as CESM-8T1/B revision of the hardware with a minimum Firmware Release 1.2.00. No earlier versions of firmware are supported. The model "B" does not show up via CLI on the PXM or via CWM. However, if the command dspcd is executed from the CESM Model B, it will display "CESM8T1B" next to the Fab number. This can be used to differentiate between CESM model A and B cards. The CESM8T1/B card also is identified by a new face plate on which the card name is suffixed with a "B.".
Model A and Model B card are interchangeable, except when multi-framing is enabled on Model-B. In that case, multi-framing must be disabled before changing cards. Note that the default framing mode is non-multiframe (in order to have a compatibility between Model-A & Model-B).
The CESM8T1/B card supports 1:N redundancy.
PXM-UI-S3
Standard clocking in the MGX is supported with a built-in Stratum-4 clock source. For network applications that require a higher clock accuracy, the PXM-UI back card used with the Stratum-4 can be replaced with an optional PXM-UI-S3 back card that carries a Stratum-3 clock. This clock reference conforms to AT&T T1.5 and ITU G.824 specifications. A provision is also made for a Service Provider to connect an external clock source, if necessary.
The default clock is the internal Stratum-4. Pertinent CLI and MIB support are provided for Stratum-3 configuration. The PXM-UI-S3 back card is also recognized by the Cisco WAN Manager.
The Stratum-3 Clocking feature on the PXM-UI-S3 was introduced in Release 1.1.31, but support was removed in subsequent releases. It is being supported again in Release 1.2.00 and higher.
Hardware Changes
The new PXM-UI-S3 supports both T1 and E1 interfaces through an RJ-45/48 connector.
CLI
A new CLI cnfclklevel permits the user to set the STRATUM level desired.
Default Settings
VISM Release 2.2 on MGX 8250, MGX 8850 Release 1, and MGX8230 Switchest supported on the PXM-UI-S3 or this release. The external clock interace cannot be used for Stratum 4 with UIS3 backcard.
Warning
* cnfclklevel 3
* cnfextclk (with T1/E1 option)
VISM Release 2.2 on MGX 8250, MGX 8850 Release 1, and MGX8230 Switches
Refer to the Release Notes for Cisco Voice Interworking Service Module Release 2.2(0) for information about VISM features, upgrade instructions, and anomalies. Product documentation for VISM Release 2.2 is available at the following URLs:
http://www.cisco.com/univercd/cc/td/doc/product/wanbu/mgx8850/vism22
http://www.cisco.com/univercd/cc/td/doc/product/wanbu/mgx8250/vism22
http://www.cisco.com/univercd/cc/td/doc/product/wanbu/mgx8230/vism22
Features Not Supported in This Release
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MGX 8220 Hardware That Has Been Superseded by MGX 8850-Specific Hardware
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Service Module Redundancy Support
MGX 8850 provides high-speed native ATM interfaces, which can be configured as ATM UNI ports or trunks. The following table contains redundancy support information for service modules.
Bulk Distribution is supported for T1 lines only on the SRM-3T3-C card.
Bulk Distribution is supported for T1 and E1 lines using the SRM-E card.
Network Management Features
Network management features are detailed in the CWM Release 10.5.10 Release Notes at: http://cisco.com/univercd/cc/td/doc/product/wanbu/svplus/index.htm
Port/Connection Limits
Connection limits can vary. The table below shows total connections per card, but also shows the number of connections per port with LMI enabled. For example, the new FRSM-HS2/B card using a HSSI back card can support a total of 2000 connections on the card. However, if LMI is enabled on both ports, the total number of connections goes down. If StrataLMI is enabled for one ports, that port supports 560 connections. The other port not configured for LMI can support 1000 connections, for a total of 1560 connections.
Overall, there is a limit of 16,000 connections per shelf.
Refer to Table 10 for detailed connection information.
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SNMP MIB
SNMP MGX Release 1 MIB are provided with the delivery of this release. The MIB is in standard ASN.1 format and is located in the same directory within the release bundle on CCO. These files may be compiled with most standards-based MIB compilers. The tar file for MIB contains the file release notes that contains the MIB release notes.
For changes in this MIB from the previous release, please refer to the MIB release notes.
Their are two formats contained in the bundle: old_mibFormat and new_mibFormat. The old_mib_Format is going to be discontinued in a future release.
Notes and Cautions
The following notes and cautions should be reviewed before using this release.
Loopback Plug on a HSSI:DTE Interface
Using a loopback plug on a HSSI:DTE interface is not supported and can bring the node down. Please refer to CSCdv79470 in the Known Anomalies for Platform Software Release 1.2.00 and Service Module Firmware, for more information about this anomaly.
UPC Connection Parameters
In Release 1.1.40 and higher, the default PCR is 50 cps, and the default for policing is "enabled." These settings are insufficient for running RPM ISIS protocol over the connection, and with such settings, the ISIS protocol will fail. The PCR value needs to be increased, depending upon the number of interfaces configured for ISIS on the RPM. CLI modification and changes in this release.
Depending upon your connection type, you can use the following CLIs to modify the PCR parameter.
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ForeSight and Standard ABR Coexistence Guidelines
ForeSight is similar to the rate-based ABR control system in TM 4.0 in that they both use Rate up and Rate down messages sent to the source of the connection to control the rate a connection runs at, based on congestion within the switches along that connections path. Both systems use Resource Management (RM) cells to pass these messages. There are differences between the two systems that need to be considered.
RM Cell Generation
ForeSight is a destination-driven congestion notification mechanism. The destination switch is responsible for generating the RM cells, which defaults to every 100 ms. This means that any rate modifications at the source end happen approximately every 100 ms, and the time delay between the actual congestion at the destination and the source getting to know about it could be 100 ms.
In standard ABR a source generates FRM cells every (nRM) cell intervals, where n is configurable. These are used to pass congestion information along to the destination switch, which then uses this information to generate BRM (Backward RM cells) back to the source A further consideration is that the actual user data flow will be lower for an equivalent rate due to the additional RM cells. Therefore, the more traffic being generated on a connection at any one time, the faster the feedback will be to the source.
There is also a TRM parameter which states that if no RM cells have been generated after this time has passed then one will automatically be sent. Depending upon the speed it is running at, an ABR connection may therefore react faster or slower to congestion than the equivalent ForeSight connection. (for example, if an ABR connection runs at 100 cells per second, and nRM is 32, then approximately three RM cells will be generated per second, or once every 300 msecs. If it runs at 1000 cps then an RM cell would be generated approximately every 30 msecs. In both cases, the equivalent ForeSight connection would generate an RM cell every 100 msec.)
Reaction to Feedback Messages - Rate Up
In ForeSight, in response to a Rate Up cell from the destination, the source increases its rate by a percentage of the MIR for that connection. If we call this percentage the rate increase percentage (RIP), then RIP is configurable at the card level (the default is 10 percent). In the case where MIR is low, the ForeSight rate increase will be slow as it has to increase as a percentage of MIR (rather than CIR).
On a standard ABR connection, in the event of available bandwidth (no congestion) the source increases its rate by a factor of (RIF*PCR). This means the rate increase step sizes are much bigger than for ForeSight for larger values of RIF (RIF has a range of 1/2, 1/4,....,1/32768). If RIF is not configured properly then standard ABR will ramp up its rate much faster and to a higher value. This is aided by the fact that the step sizes are bigger and the step frequency is higher in comparison with ForeSight.
Reaction to feedback messages - Rate Down
In ForeSight on receiving a Rate Down cell from the remote end, the source reduces its current rate (actual cell rate) by 13 percent. The rate decrease percentage (RDP). RDP is configurable at the card level.
In standard ABR, rate decrease is by an amount (RDF*ACR). Currently, the default value of RDF is 1/16 (6.25 percent). This means when this connection co-exists with ForeSight connections, in the event of congestion ForeSight connection reduces its rate by 13 percent whereas standard ABR connection reduces its rate by only 6.25 percent. Therefore, in the case of co-existence, if we need to approximate the same behavior across the two connection types, then RDF should be changed to 1/8, so that both connections ramp down by the same amount (13 percent).
Fast-Down
In ForeSight if the destination egress port drops any data due to congestion then the destination sends a Fast Rate Down cell. Also, if a frame cannot be reassembled at the egress due to a lost cell somewhere in the network, a Fast-down will be generated. On reception of Fast Rate Down the source reduces its current rate by 50 percent (this is again a card-level configurable parameter).
Standard ABR does not distinguish between drops and the ECN/EFCI threshold being exceeded. This means that, in case of drops in the egress port queue, a standard ABR connection rate reduces by only (RDF*ACR) but the ForeSight connection rate reduces by (ACR*0.5). Therefore, in the case of co-existence, if we need to approximate the same behavior across the two connection types then Fast Down could be effectively disabled by configuring the reaction to be 13 percent rate down instead of 50 percent.
Guidelines
The two systems will work together within the network, but as the above description suggests, if the differences between the two systems are not taken into consideration, then a ForeSight connection and an ABR connection with the same configuration parameters will not behave the same way within the network.
ABR and ForeSight provide a mechanism for distributing excess bandwidth between connections over and above the minimum rate, therefore if these guidelines are not taken into consideration then the allocation of this excess bandwidth may be biased toward connections running one of these algorithms over connections running the other.
If this is a requirement, the following guidelines may be useful, assuming ForeSight is set to defaults except for Fast Rate Down which is set for 13 percent.
1.
100 milliseconds, to match that of ForeSight. This calculation is based on the expected average, or sustained, cell rate of the connection. However, if the (potential) fast-down messages from ForeSight are left to equate to 50 percent rate down, then an estimate of how often this may occur needs to be made and factored into the equation. If the connection receives Fast-down messages, then this would make the ForeSight connection react faster than the equivalent ABR connection to congestion. To compensate for this, Nrm needs to be set at a value of less than 100 msecs, a suggested value to aim for is between 60-70 msecs (this would be approximate as n is configurable in steps of 2**n). This would mean that, in the event of congestion, the ABR connection would start to react faster.2.
3.
The following worked examples may help explain this further
Assume a network is currently running ForeSight with default parameters, and supports the following four connection type, where CIR = MIR, PIR = port speed, and QIR = PIR:
T1 Port Speed 64K CIR
Example:
CIR = MIR = 64K
PIR = QIR = port speed = 1544
Fastdown = 13%(The calculation used to convert between frame based parameters (CIR, PIR, and so on.) and their equivalent cell-based parameters is FR_param *3/800. This allows for cell overheads, and so on. based on frame sizes of 100 octets.)
CIR = MIR = (64000*3/800) = 240 cps
PIR = QIR = (1544 *3/800) = 5790 cpsForeSight ABR
Rate-up equals (240*.1) = 24 cps RIF equals x where (1590/x) = 24 cps
X needs to be approx 200
RIF equals 256 (nearest factor of 2)RDF equals 13% RDF = 1/8
Nrm equals 100 msecs Nrm equals 32RM cells will be generated somewhere between 6 (5790 cps approx equal to 32 cells per 6 msecs) and 133 msecs (240 cps approx equal to 32 cells every 133 msecs) depending on ACR.
CLI Modifications in 1.2.00 Baseline
Table 11 lists the new and modified commands in Release 1.2.00 baseline.
Table 11 New/Modified CLI Commands in This Release
addapsln
The parameter "archmode" sets the APS architect mode to be used on the working/protection line pairs. The new value "5" is added to specify 5: 1+1 Annex A.
ITU APS Annex-A
addcon
Two new values have been introduced for cesCas type to configure a channel with the multiframe option enabled. The values are ds1SfCasMF and ds1EsfCasMF.
The channels on a particular line can be either all MF (SF MF or ESF SF) or all non-mf (SF or ESF). The first connection type added on a particular line (mf/non-mf) decides the sync mode. The second connection must have the same cesCas type, and so on.
FRSM-HS2/B
adddiagtest
Diagnostics.The diagnostic commands are modified for test number 8-SRM M13 Access. This command will perform SRM or SRM-E hardware online diagnostics, depending upon what kind of cards are in the slot. Refer to the Release Notes for Cisco WAN MGX 8850, MGX 8230, and MGX 8250 Software Version 1.1.40 at http://www.cisco.com/univercd/cc/td/doc/product/wanbu/mgx8850/14/rnotes/rn1140.htm
SRM-E
addlink
Bulk redundancy/distribution. The existing command addlink is modified to link a certain number of T1/E1 channels from a bulk interface on SRM-E to a service module's T1/E1 lines. This command checks the card type of the service module in the target slot. The service module must be a T1/E1 type, depending upon the tributary type configured for the SRM-E line using the cnfln command. A service module will switch all its lines to bulk mode even if only one line is mapped to a tributary from SRM-E.
Note
SRM-E
addln
Existing addln command is modified to support per line interface type configuration (used only with the 12IN1-8S). If the user doesn't specify <interface_type>, the default type V.35 is used.
FRSM-HS2/B
SRM-E
addlnloop
Physical interface. Existing command addlnloop is modified to add a logical loopback on a line on the new card. (SRM-E)
SRM-E
addred
Redundancy activities. The existing command addred is modified to configure redundancy on the new card.
SRM-E
clralldiagtests
Command is modified for test number 8-SRM M13 Access. The command will perform SRM or SRM-E hardware online diagnostics, depending upon what kind of cards are in the slot.
SRM-E
clralm
Managing alarms. Existing command clralm is modified to clear alarms on a line on the new card.
SRM-E
clralmcnt
Managing alarms. The existing command clralmcnt is modified to clear alarm counts on a line on the new card.
SRM-E
cnfbert
BERT activities. The existing command cnfbert is modified to configure a line or port for BERT and start the test on the new card.
SRM-E
cnfclktype
Existing cnfclktype command is added to FRSM-HS2B to configure line clock type for V.35/X.21 interfaces. This command is valid on the FRSM-HS2B-12IN1 card. Command is valid on SRM-E.
FRSM-HS2/B
cnfdiagparams
Command is modified for test number 8-SRM M13 Access. The command will perform SRM or SRM-E hardware online diagnostics, depending upon what kind of cards are in the slot.
SRM-E
clrdiagresults
Command is modified for test number 8-SRM M13 Access. The command will perform SRM or SRM-E hardware online diagnostics, depending upon what kind of cards are in the slot.
SRM-E
cnfclklevel
Permits the user to set the STRATUM level desired. (S-3 Clocking)
PXM-UI-S3
cnfdiagtest
Command is modified for test number 8-SRM M13 Access. The command will perform SRM or SRM-E hardware online diagnostics, depending upon what kind of cards are in the slot.
SRM-E
cnflink
Bulk redundancy/distribution. The existing command cnflink is modified to configure the link for T1 byte-sync mapping on the new card. For byte-sync mapping on sonet interfaces, the T1 framing format should be configured.
The framing format can be specified at line level for all links using the cnfln command. It can be then overridden on a per link basis using the cnflink command.
Note
SRM-E
cnfln
Existing cnfln command is modified on FRSM-HS2/B to support new MIB objects.
Note
For SRM-E, cnfln command is modified to support new MIB objects and new enumerations for line rate.
For tributary type, option VT2 (carries E1 signals in Sonet) is not supported in Release 1.2.00.
For tributary mapping type, only option, 2 byte-synchronous mapping, is supported for T1.
FRSM-HS2/B
SRM-E
cnfsrmcklsrc
Managing clock sources. Existing command cnfsrmclksrc is modified to support the new SRM-E card.
SRM-E
clrsrmcnf
Managing configuration. The existing command clrsrmcnf is modified to clear all card configuration including distribution links. The configuration cannot be cleared if redundancy is enabled.
SRM-E
delbert
BERT activities. The existing command delbert is modified to delete/terminate the operation in progress on the new card.
SRM-E
deldiagtest
Command is modified for test number 8-SRM M13 Access. The command will perform SRM or SRM-E hardware online diagnostics, depending upon what kind of cards are in the slot.
SRM-E
dellink, delslotlink
Bulk redundancy/distribution. The existing commands dellink/delslotlink are modified to delete distribution links on the new card. After the last distribution link to a service module is deleted, the service module switches all its lines to non-bulk mode (to its back card).
SRM-E
delln
Physical interface. Existing command delln is modified to disable a line on the new card.
Note
SRM-E
dellnloop
Physical interface. Existing command dellnloop is modified to delete a logical loopback on a line on the new card.
SRM-E
delred
Redundancy activities. The existing command delred is modified to delete the redundancy configuration on the new card.
SRM-E
dspalmcnt
Managing alarms.The existing command dspalmcnt is modified to display alarm counts on a line on the new card.
SRM-E
dspalm
Managing alarms. Existing command dspalm is modified to display alarms on a line on the new card.
SRM-E
dspalmcnf
Managing alarms.Display alarm configuration for a line.
SRM-E
dspalms
Managing alarms. Existing command dspalms is modified to display alarms on all lines of a slot on the new card.
SRM-E
dspapsln
Guest
