The Multi Link Manager ports (MLM)

Revised for CPX 4.1.0.
Terminology
Goal
Configuration of the MLM ports
Statistics of the MLM ports
SNMP traps generated for the MLM port

Terminology top

P-LINK
It stands for Permanent link and defines a permanent connection toward the remote device.
It also defines a kind of "logical" interface in the CPX that several drivers can emulate.
S-LINK
It stands for Switched link and defines a switched connection toward the remote device. A switched connection is established only upon request. It also defines the kind of "logical" interface offered in the CPX by EIR and Q931 drivers.
Link-check
It is a MLM/ML procedure used to detect end-to-end link (or emulated p-link) real functioning, regardless of the lower protocol layers states.
It consists of periodical link-check frames exchange.
Dial-on-Demand
It is a feature that allows to establish Switched connections as soon as there are data to send.
Short-Hold-Mode
This feature makes Switched connections appear as permanent ones: connection is automatically established as soon as there are data to send and automatically closed after a configurable inactivity time.
The procedure is transparent for the applications, that is sessions are not aware of connections/disconnections.
True link backup
When MLM is configured with both P-LINK and S-LINK lower ports, it will use P-LINK whenever the end-to-end P-LINK connection is functioning and will use S-LINK only in case of P-LINK failure.
The True link backup name is justified by the use of an end-to-end protocol that verifies P-LINK integrity (the previously described Link-Check), extending the lower protocol layers diagnostics which are often imprecise, moreover the P-LINK is continuosly monitored so that when the failure ends P-LINK will be automatically reused and S-LINK connection closed. If timeouts are properly set the applications will not notice the link changes.

Goal top

Multi-Link Manager (MLM) basic concepts.

The MLM driver is a very versatile driver. Originally devised as an intermediate layer to offer switched services for ISDN B-Channels to drivers and protocols that can support only permanent connections, has become an "always present" adaptation driver which provides many extra functions like Dial-on-Demand, Short-Hold-Mode, and true link backup.

MLM driver is the "gate" to:

Within CPX the MLM appears to upper drivers as a single P-LINK port while it is able to use two lower ports of P-LINK and S-LINK types.

Configuration of the MLM ports top

The Multi-Link Manager port is referred in the Abilis CPX by the "MLM" abbreviation, it has all the parameters described in the following section.

The layout of the MLM port parameters changes considerably according to the used P-Link and S-Link port types.

Here are some examples of the MLM port parameters.

MLM over SYNC.

[18:42:32] ABILIS_CPX: D P PO:MLM

PO:501 ------------------------------------------------------------------------
MLM    LOG:NO      MPX:YES LC:YES T1:1000 T3:3000 N2:3  CIPHER:NO    CRKEY:DFT
       PLINK:1   
       SLINK:NONE

MLM over FRAME-RELAY.

PO:502 ------------------------------------------------------------------------
MLM    LOG:NO      MPX:YES LC:YES T1:1000 T3:3000 N2:3  CIPHER:NO    CRKEY:DFT
       PLINK:102   DLCI:16       CC:YES                  SC:4    
       CIR:19200                 BC:19200                BE:0    
       SLINK:NONE

MLM over PLINK-E.

PO:503 ------------------------------------------------------------------------
MLM    LOG:NO      MPX:YES LC:YES T1:1000 T3:3000 N2:3  CIPHER:NO    CRKEY:DFT
       PLINK:701   
       SLINK:NONE

MLM over ISDN (over permanent B-Channel).

PO:504 ------------------------------------------------------------------------
MLM    LOG:NO      MPX:YES LC:YES T1:1000 T3:3000 N2:3  CIPHER:NO    CRKEY:DFT
       PLINK:17    BCHAN:B2   
       SLINK:NONE

MLM over EIR (PLINK).

PO:505 ------------------------------------------------------------------------
MLM    LOG:NO      MPX:YES LC:YES T1:1000 T3:3000 N2:3  CIPHER:NO    CRKEY:DFT
       PLINK:200   VSP-ID:10
       SLINK:NONE

MLM over EIR (SLINK).

PO:506 ------------------------------------------------------------------------
MLM    LOG:NO      MPX:YES LC:YES T1:1000 T3:3000 N2:3  CIPHER:NO    CRKEY:DFT
       PLINK:NONE  
       SLINK:200   
       RTY:LIN     NRTY:5        TB:3     DDT:220        VDT:10   
       CGI:777                   SGI:*           
       CDI:*                     SDI:*                   
       CGO:#                     SGO:#                   
       CDO:123                   SDO:#

MLM over FRAME-RELAY and EIR.

PO:507 ------------------------------------------------------------------------
MLM    LOG:NO      MPX:YES LC:YES T1:1000 T3:3000 N2:3  CIPHER:NO    CRKEY:DFT
       PLINK:102   DLCI:16       CC:YES                  SC:4    
       CIR:19200                 BC:19200                BE:0    
       SLINK:200   
       RTY:LIN     NRTY:5        TB:3     DDT:220        VDT:10   
       CGI:777                   SGI:*           
       CDI:*                     SDI:*                   
       CGO:#                     SGO:#                   
       CDO:123                   SDO:#

MLM over NO LINKS.

PO:508 ------------------------------------------------------------------------
MLM    LOG:NO      MPX:YES LC:YES T1:1000 T3:3000 N2:3  CIPHER:NO    CRKEY:DFT
       PLINK:NONE   
       SLINK:NONE

By the previous example, it is possible to underline that:

All the changes made on the MLM port parameters can be immediately activated through the initialization command INIT PO: (this property is underlined by uppercase characters in their name), however it has to be noted that a possible active connection on the S-Link channel is closed with 80 90 80 8A code. The MLM port will immediately be ready for a new communication, without affecting the upper level driver.

The changes made on the parameter LOG: are immediately active.

Details of the MLM ports parameters

LOG: Events logging activation and generation of alarm signals
DS NO, D, S, A, L, T, ALL, +E

Usually this parameter makes possible to activate/deactivate logging functionalities of meaningful events of the port as well as the detection and signalling of alarms in case of critical events.

The following table shows the available options and the related functionalities usable by the parameter:

Option Meaning
D Recording of the driver state changes and/or the meaningful events in Debug Log
S Recording of the driver state changes and/or the meaningful events in the System Log
A Periodic detection of possible alarms. The detected alarms can be displayed the command ALARM VIEW or by the analogous command available on the UTILITY of the LCD display on the front panel
L On alarm detection, acoustic signal generation plus a message on the LCD display. This function depends on activation of alarms detection by the "A" option
T Generation by the Agent SNMP of Abilis CPX of SNMP traps corresponding to any change of the driver state and/or occurring of meaningful events

Beside the already described options the following values are also allowed:

Option Meaning
NO It means that all the logging functionalities, alarms detection and generation, above mentioned, are disabled.
ALL It means that all the logging functionalities, alarms detection and generation, above mentioned, are enabled.
+E This option added to one or more of the previous ones, extends its (their) set of meaningful events.
The value "ALL+E" activates all the options and extends the set of meaningful events.
The value "NO+E" is meaningless so it is ignored.

Options can be combined together.

Some examples:

By using the characters "+" and "-" as prefix of one or more options is possible to add or delete one or more functionalities without setting from the scratch the value of the parameters.

Some examples:

warning! The changes made on this parameter are immediately activated, without the need of initialization commands.

MPX: Activation of the Abilis MPX protocol
YES NO, YES, EXT

It makes possible to activate the multiplexing of DATA, "Link-Check", VOICE frames type.

Value Meaning
NO Abilis MPX multiplexing is not active. MLM is running in "transparent" mode over the P-LINK interface, as if it would not be there.
YES Abilis MPX multiplexing is active only for the data protocols LAPB and LINK-FR.
EXT Abilis MPX multiplexing is active for ANY data protocol.

warning!The activation of the Abilis MPX multiplexing protocol, a proprietary protocol, requires that the counterpart is running MPX as well. It is also necessary that the MPX value is identical for the counterparts.

LC: Activation of the Abilis MPX Link-check protocol
YES NO, YES

It enables/disables the use of the "Link-Check" protocol, and consequently the transmission of "Link-check" frames.

The link-check protocol is automatically disabled when MPX:NO.

Most of the application have benefits from the Link-check protocol, however there are cases where the generated traffic is not desired while the voice/data multiplexing is still required, as in the cases of VoIP applications with dial-up accesses.

It is also important to note that with LC:NO the "true link backup" is disabled.

Value Meaning
NO Link-Check protocol is not active.
YES Link-Check protocol is not active.

T1: Link-Check "probes" Timeout
1000 200-3000 (in milliseconds)

Maximum time to wait for a Link-Check "probe" acknowledge. If this time elapses without receiving the acknowledge the "probe" is immediately repeated, as a result "not acknowldged probes" are repeated every T1: milliseconds.

T3: Time interval between transmission of Link-Check "probes" when link is functioning
3000 600-9000 (in milliseconds)

This is the time interval between a correctly sent and acknowledged Link-Check "probe" and the next one to send while the link is regularly working (e.g. P-LINK state is READY). It has relationships with the parameter T1: and it has to satisfy the simple rule: T3 > T1 * 2.

N2: Maximum number of Link-Check "probes" retransmission
3 1 - 99

Sets the maximum number of Link-Check "probes" retransmission.

If this counter runs over, it means "N2" Link-Check "probes" have been sent without receiving any acknowledge, the P-Link or S-Link channel is declared out of service.

In the case it occurs on the P-Link channel, the communication will be activated on the S-Link channel, providing that it is properly configured.

In the case it occurs with the S-Link channel, the connection is closed with the code 80 90 80 8B; if it happens three times consecutively the port will be placed in the "STOPPED2" state, without being able to receive or make further calls.

To recover from the error it is necessary to execute the INIT PO: command.

If alarm detection was enabled, i.e. if LOG is set with the "A" option, it is also possible to recover from the error with the ALARM RESET command or using the analogous menu available on the LCD display of the front panel.

If the communication cannot go on any longer either on P-Link or S-Link, the upper level driver will be advised of the error and point out a "Level 1 Down".

CIPHER: Enable and select cryptography
NO NO, DATA, VOICE, ALL

It enables and selects the cryptography to be applied on the frames passing through the port. Cryptography can be selectively applied to the different traffic types (VOICE and DATA):

Value Meaning
NO No cryptography is applied.
DATA Cryptography is applied only on DATA traffic type.
VOICE Cryptography is applied only on VOICE traffic type.
ALL Cryptography is always in use, whatever is the traffic data type.
CRKEY: Index of the key used for the cryptography
DFT DFT, 1 - 63

It selects the key to be used for cryptography operations.

Users can choose either the default key supplied by the system ("CRKEY:DFT"), or one of the keys defined in the cryptography keys table, in which case the numeric value (from 1 to 63) corresponding to the desired CRKEY has to be specified.

If the configured value refers to a missing CRKEY it will be shown inside square brackets, e.g. "CRKEY:[5]" means that the key number 5 is not present in the table.

If the parameter CIPHER: is set to "NO", the value of CRKEY: is useless.

PLINK: Identifier of the Abilis CPX port of P-Link level
NONE 1 - 999, NONE

It defines the P-Link port of the lower level, which can only be SYNC, FR, ISDN, PLINKE or EIR type.

If no P-Link port is required, the value "NONE" must be set.

BCHAN: Identifier of the channel B to use (only if the P-Link is an ISDN port type)
B1 B1, B2

The parameter appears and can be modified only if the port referred by the parameter PLINK: is an ISDN Basic Rate port type, i.e. the service provided by "only data" ISDN adaptors.

It defines the channel to be used on the lower level ISDN port.

DLCI: Identifier of the DLCI to use (only if the P-Link is a FR port type)
NONE 16-991, 1024-63487, 131072-8126463, NONE

The parameter appears and can be modified only if the port referred by the parameter PLINK: is a FR port type.

It defines the identifier of the DLCI to use the lower lever FR port.

The value "NONE" means "no DLCI" and it disables the connection with the lower level FR port.

The validity of allowed values intervals for the DLCI identifier depends on the length of the header Frame-Relay in use:

Value Meaning
NO No cryptography is applied.
DATA Cryptography is applied only on DATA traffic type.
VOICE Cryptography is applied only on VOICE traffic type.
ALL Cryptography is always in use, whatever is the traffic data type.
CC: Activation of the congestion control
YES NO, YES

The parameter appears and can be modified only if the port referred by the parameter PLINK: is a FR port type.

It makes possible to apply or to not apply the throughput reduction as reaction to congestion notifications.

warning!Not obeying to congestion notification may cause severe malfunctioning, therefore we strongly reccommend to always use CC:YES. Ignoring congestion notification may be needed for some testing activities, certainly not during the regular work.

SC: Value of the constant "step count", used in congestion control (only if the P-Link is a FR port type)
4 1 - 50

The parameter appears and can be modified only if the port referred by the parameter PLINK: is a FR port type.

It sets how many consecutive frames with BECN=1 have to be received for reducing the throughput, according to the rule fixed by ANSI T1.618 annex A §2.1.1.

Value 4 suits the most frequent situations, however the right value can be evaluated by using the Calculator.

CIR: Value of "Committed Information Rate" (only if the P-Link is a FR port type)
0 0, 4800 - 2500000 in bit/sec

The parameter appears and can be modified only if the port referred by the parameter PLINK: is a FR port type.

It defines the value of "Committed Information Rate", i.e. the throughput the frame-relay network has to guarantee in normal working conditions. This throughput is measured in the time interval TC (Time Committed) given by the following formula: TC=BC/CIR.

The set up value must correspond to that one established by contract with the operator of the frame-relay network.

BC: Value of "Burst Committed" (only if the P-Link port is a FR port type)
0 0, 2400 - 5000000 in bits

The parameter appears and can be modified only if the port referred by the parameter PLINK: is a FR port type.

It defines the "Burst Committed", i.e. the number of bits the network can accept, during the time interval TC, to guarantee the CIR.

If the network is congested, it sends a signal (BECN or FECN) that require the user to progressively reduce his throughput to values smaller than CIR.

The set up value must correspond to that one established by contract with the operator of the frame-relay network.

BE: Value of "Burst Excess" (only if the P-Link is a FR port type)
0 0 - 5000000 in bits

The appears and can be modified only if the port referred by the parameter PLINK: is a FR port type.

It defines the "Burst Excess", i.e. the number of bits in excess that the network can manage, during the time interval TC, if there is availability of exceeding resources. The "exceeding throughput" is evaluated by using the following formula ThExcess=BE*TC.

When the network does not have resources in excess sends a signal (BECN or FECN) that engages the user to immediately limit the throughput to the value of the CIR.

The set up value must correspond to that one established by contract with the operator of the frame-relay network.

VSP-ID: Service identifier (only if the P-Link is a EIR port type)
NONE NONE, 1 - 32

This parameter indicates which Virtual Synchronous Port (VSP) of those defined in the TDM table the MLM must use.

SLINK: Identifier of the Abilis CPX port of S-Link level
NONE 1 - 999, NONE

It defines the S-Link port of lower level, it can be of EIR or Q931 type.

If the S-Link port is not desired, the parameter has to be set to "NONE".

RTY: Calls repetition rule on failures
INC LIN, INC, US

It allows to select the calls repetition rule on the S-Link channel following an unsuccessful call, and if the attempts are exhausted the S-Link channel is placed in STOPPED1 state.

If the switched connection is established the attempts counter is reset (connection was established!), however if "link-checks" are active a "second level verification" is executed and if it fails the connection is classified as "link-check failure". Three consecitive "link-check failures" forces the S-Link channel in STOPPED2 state preventing any further outgoing or incoming call!

Warning! The behaviour upon exhausted attempts is slightly different when RTY:US, see below or details.

Value Calls repetition rules
LIN The time interval between a call attempt and the next one is fixed and configurable through the parameter TB:.
INC The time interval between a call attempt and the next one, is doubled at every attempt, starting with the value defined in the parameter TB:.
US The abbreviation "US" stands for "unattended site".
In this case the S-Link channel driver activates the following procedure until success:
  1. the driver executes a number of tries equal to the value of the parameter NRTY: every TB: seconds, or until three consecutive "link-check" errors occour;
  2. the driver makes 8 calls every 15 minutes;
  3. the driver makes 4 calls every 1 hour;
  4. the driver makes 9 calls every 2 hours;
  5. the driver makes 8 calls every 6 hours;
  6. the driver is placed in the state STOPPED1 or STOPPED2 caused by the last error;
This procedure allows an "automatic recovery" from critical situations within three days from the first failure occurrence, afterwards a maintenance intervention is required.

It is important to emphasize that points 2,3,4,5,6 of the procedure do not distinguish between failure's reason (connection not established or connection established with "link-check" error) until the last attempt is reached and the last failure reason is used to set the final state (STOPPED1 or STOPPED2).
NRTY: Maximum number of call repetitions
5 0 - 65534, NOMAX

It specifies the maximum number of call repetitions for the S-Link channel when the connection cannot be established. Once attempts are exhausted the S-Link chennel is place in STOPPED1 state.

Warning! If the channel is established BUT the "link-check protocol" detects link-check failure for three times consecutively the port is placed in STOPPED2 state regardless the NRTY counter.

Info The behaviour upon exhausted attempts is slightly different when RTY:US.

Value Meaning
0 Outgoing calls are disabled.
1-65534 Calls are repeated as many times as the value.
NOMAX Calls are repeated indefinitely.
For "RTY:INC" the time interval of calls after the 65535th will not increase further, keeping the interval TB: * 65535 seconds.
For "RTY:US" the actual behaviour is identical to RTY:LIN because the condition that starts the "unattended site retries" will not be reached.
TB: Time base interval between calls repetitions
3 3 - 255 (in seconds)

It defines the "base" time interval that the retry procedure set in RTY: uses to calculate the delay between a call attempt that fails and the next one.

DDT: Data disconnect timeout
220 from 10 up to 65535 (in seconds)

After "DDT:" seconds from the last sent or received "data" frame the S-LINK connection will be closed, unless "voice" frames still need the connection.

Warning! The disconnection actually occur when both DDT: and VDT: expire.

VDT: Voice disconnection timeout
10 from 5 up to 900 (in seconds)

After "VDT:" seconds from the last sent or received "voice" frame the S-LINK connection will be closed, unless "data" frames still need the connection.

Warning! The disconnection actually occur when both DDT: and VDT: expire.

CGI: Calling address of the incoming call
* from 1 up to 20 numerical characters [0- 9], *

It sets up the calling address, that the incoming call must contain.

The character "*" means "any number".

SGI: Calling sub-address of the incoming call
* from 1 up to 20 alphanumerical [0- 9, a - z, A- Z], *

It sets up the calling sub-address, that the incoming call must contain.

The character "*" means "any character".

CDI: Called address of the incoming call
* from 1 up to 20 numerical characters [0- 9], *

It sets up the called address, that the incoming call must contain.

The character "*" means "any number".

SDI: Called sub-address of the incoming call
* from 1 up to 20 alphanumerical [0- 9, a - z, A- Z], *

It sets up the called sub-address, that the incoming call must contain.

The character "*" means "any character".

CGO: Calling address of the outgoing call
# from 1 up to 20 numerical characters [0- 9], #

It sets up the calling number of the outgoing call.

The character "#" means "no number", if it is set, the outgoing call will not contain the calling address.

SGO: Calling sub-address of the outgoing call
# from 1 up to 6 alphanumerical [0- 9, a - z, A- Z], #

It sets up the calling sub-address of the outgoing call.

The character "#" means "no number", if it is set, the outgoing call will not contain the calling sub-address.

CDO: Called address of the outgoing call
# from 1 up to 20 numerical characters [0- 9], #

It sets up the called number of the outgoing call.

The character "#" means "no number", if it is set, the outgoing call will not contain the called address.

SDO: Called sub-address of the outgoing call
# from 1 up to 6 alphanumerical [0- 9, a - z, A- Z], #

It sets up the called sub-address of the outgoing call.

The character "#" means "no number", if it is set, the outgoing call will not contain the called sub-address.

Statistics of the MLM ports top


Example of how to check the state and statistics of MLM ports by the command D S

[18:42:32] ABILIS_CPX: D S PO:501

PO:501 ------------------------------------------------------------------------
MLM    +--------+--- Global ----+------- P-Link -------+------- S-Link -------+
       | STATE: |    READY      |        READY         |   LINK-NOT-PRESENT   |
       +--------+---------------+----------------------+----------------------+
       PLINK-DN1:1            PLINK-DN2:1     
       SLINK-ST1:0            SLINK-ST2:0            TIME-CUR-CALL:0     
       RTY:0       DDT:0      VDT:0       USRTY:0    TDEL:0        TREM:0     
       -----------|---INPUT---|--OUTPUT---|-----------|---INPUT---|--OUTPUT---|
       FAIL-CALL  |          0|          0|SUCC-CALL  |          0|          0|
       TIME-CALL  |          0|          0|           |           |           |
       V-NO-CRKEY |          0|          0|D-NO-CRKEY |          0|          0|
       V-BAD-CIPH |          0|           |D-BAD-CIPH |          0|           |
       ------------------------------------------------------------------------

The MLM ports have not extended statistics, that's why the execution of the command D SE will show again the not extended ones in the following format:

[18:42:32] ABILIS_CPX: D SE PO:501

PO:501 ------------------------------------------------------------------------
MLM    --- Cleared 028:00:15:01 ago, on 14/04/2000 at 11:05:34 ----------------
       PLINK-DN1:1            PLINK-DN2:1     
       SLINK-ST1:0            SLINK-ST2:0            TIME-CUR-CALL:0     
       -----------|---INPUT---|--OUTPUT---|-----------|---INPUT---|--OUTPUT---|
       FAIL-CALL  |          0|          0|SUCC-CALL  |          0|          0|
       TIME-CALL  |          0|          0|           |           |           |
       V-NO-CRKEY |          0|          0|D-NO-CRKEY |          0|          0|
       V-BAD-CIPH |          0|           |D-BAD-CIPH |          0|           |
       ------------------------------------------------------------------------

The information "Cleared DDD:HH:MM:SS ago, at DD/MM/YYYY HH:MM:SS", referred by the extended statistics, shows both the elapsed time from the last reset of the statistics (by the format "days:hours:minutes:seconds") and date/time of its execution (by the format "day/month/year" and "hours:minutes:seconds").

Details of the MLM state fields and statistics

Global STATE: Global current state
READY, DOWN, ERR

It reports the global current state, as seen by the upper port (e.g. IPRTR, LPAB, etc ...):

Driver States Meaning
MLM (Global) READY MLM is READY and usable.
DOWN MLM is DOWN.
ERR Software error. Contact Abilis service.
P-Link STATE: P-Link channel current state
READY, LINK-NOT-PRESENT, DOWN1, DOWN2, ERR

It reports the P-Link channel current state:

Driver States Meaning Values reported into:
System Log Events Log LCD display
MLM
(P-Link)		 READY The P-Link is ready and usable. RD
LINK-NOT-PRESENT The value configured in PLINK: does not refer to a valid or running port. ln
LINK-ERROR The port configured in PLINK: is a valid and running port, however there are problems with other parameters.
E.g. when MLM uses a frame relay port and it tries to use a DLCI already used, require an unacceptable CIR, etc...		 le
DOWN1 P-Link channel is down because of a DOWN state in the lower protocol driver, as in the case of SYNC port with CD:YES and current DCD state is DOWN. d1
DOWN2 P-Link channel is down because the "link-check protocol" detected a failure, while the state in the lower protocol driver is "UP". d2
ERR Software error. Contact Abilis service. NA
S-Link STATE: S-Link channel current state
READY, READY-DELAY, CALLING, CALLED, CONNECTED TO, CONNECTED FROM, CLEARING, CLEARED, LINK-NOT-PRESENT, STOPPED1, STOPPED2, US-DELAY, ERR

It reports the S-Link channel current state:

Driver States Meaning Values reported into in:
System Log Events Log LCD Display
MLM
(S-Link)		 READY The S-Link is ready and usable. RD
READY-DELAY The S-Link channel is ready to receive a call but not to place it. It is executing a delay because of a previous call attempt failure.
CALLING A call is outgoing. Waiting for call acceptance or call refusal.
CALLED A call is incoming. Waiting to accept/refuse the call.
CLEARING A call disconnection has been generated from the local MLM. Waiting for completion of the disconnection procedure.
CLEARED A disconnection request has been received. Waiting to complete the disconnection procedure.
US-DELAY The S-Link channel is in the "unattended site" procedure and it is executing the delay before the next attempt. It can appear only if RTY:US.
CONNECTED-TO it is connected as a result of one outgoing call. CN
CONNECTED-FROM it is connected as a result of one incoming call. CN
LINK-NOT-PRESENT The value configured in SLINK: does not refer to a valid or running port. ln
STOPPED1 The S-Link channel exhausted the call retry attempts that was configured through RTY: and NRTY: parameters.

Further outgoing calls are not possible while incoming calls can be accepted.

This error condition can be reset with the INIT PO: command or, if alarm is active, with either the ALARM RESET command or the analogous menu available on the LCD display of the front panel.		 s1
STOPPED2 The "link-check protocol" detected three consecutive failures on either incoming or outgoing calls.

Both outgoing and incoming calls are not anymore possible.

This error condition can be reset with the INIT PO: command or, if alarm is active, with either the ALARM RESET command or the analogous menu available on the LCD display of the front panel.		 s2
ERR Software error. Contact Abilis service. NA
PLINK-DN1: Number of times that P-Link channel reached the DOWN1 state
0 - 4.294.967.295

The counter PLINK-DN1 reports the number of times the P-Link channel reached the DOWN1 state.

PLINK-DN2: Number of times that P-Link channel reached the DOWN2 state
0 - 4.294.967.295

The counter PLINK-DN2 reports the number of times the P-Link channel reached the DOWN2 state.

SLINK-ST1: Number of times that S-Link channel reached then STOPPED1 state
0 - 4.294.967.295

The counter SLINK-ST1 reports the number of times that S-Link channel reached the STOPPED1 state.

SLINK-ST2: Number of times that S-Link channel reached the STOPPED2 state
0 - 4.294.967.295

The counter SLINK-ST2 reports the number of times that S-Link channel reached the STOPPED2 state.

TIME-CUR-CALL: Duration of the current connection
0 - 4.294.967.295

The counter TIME-CUR-CALL reports the overall duration of the current connection.

RTY: Number of reattempt of the current call
0 - NRTY

The counter RTY reports the number of reattempt of the current call, as used by RTY:LIN/INC/US procedures.

DDT: Number of seconds to go for the channel disconnecion by "DATA frames inactivity".
60 - 65535 (in seconds)

The counter DDT shows how many seconds to go for the channel disconnecion by "DATA frames inactivity".

The channel will be actually disconnected when both DDT: and VDT: values will reach 0.

VDT: Number of seconds to go for the channel disconnecion by "VOICE frames inactivity".
1 - 900 (in seconds)

The counter VDT shows how many seconds to go for the channel disconnecion by "VOICE frames inactivity".

The channel will be actually disconnected when both DDT: and VDT: values will reach 0.

USRTY: Number of reattempt in modality "Unattended Site"
0 - 65.535

The counter USRTY reports the number of reattempt in modality "Unattended Site" (parameter RTY:US).

TDEL: S-Link channel: seconds elapsed since entering the READY-DELAY state
0 - 65.535 (in seconds)

The counter TDEL reports the seconds elapsed since the S-Link channel entered the READY-DELAY state.

TREM: S-Link channel: seconds to go to move from READY-DELAY to READY state
0 - TDEL (in seconds)

The counter TREM reports the seconds to go before the S-Link channel leaves the current READY-DELAY state and enters the READY one.

FAIL-CALL Number of incoming/outgoing calls failed
0 - 4.294.967.295

The counter FAIL-CALL (INPUT) reports the number of incoming calls failed.
The counter FAIL-CALL (OUTPUT) reports the number of outgoing calls failed.

SUCC-CALL Number of incoming/outgoing calls successful
0 - 4.294.967.295

The counter SUCC-CALL (INPUT) reports the overall number of incoming call successful.
The counter SUCC-CALL (OUTPUT)reports the overall number of outgoing calls successful.

TIME-CALL Duration of connections caused by incoming/outgoing calls
0 - 4.294.967.295

The counter TIME-CALL (INPUT) reports the overall duration of those connections caused by incoming calls.
The counter TIME-CALL (OUTPUT) reports the overall duration of those connections caused by outgoing calls.

V-NO-CRKEY Number of VOICE frames discarded because of missing CRKEY.
0 - 4.294.967.295

The counter V-NO-CRKEY (INPUT) is incremented every time a VOICE frame is received, but it is not decryptable because the index of the cryptographic key, set in the parameter CRKEY:, refers to a non-existent cipher key.

The counter V-NO-CRKEY (OUTPUT) is incremented every time a VOICE frame is received from the upper level, but it is not encryptable because the index of the cryptographic key, set in the parameter CRKEY:, refers to a non-existent cipher key.

V-BAD-CIPH Number of discarded VOICE frames because of decryption failure
0 - 4.294.967.295

The counter V-BAD-CIPH (INPUT) is incremented every time a received VOICE frame must be discarded because the decryption failed. This can be caused by:

D-NO-CRKEY Number of DATA frames discarded because of missing CRKEY.
0 - 4.294.967.295

The counter D-NO-CRKEY (INPUT) is incremented every time a DATA frame is received, but it is not decryptable because the index of the cryptographic key, set in the parameter CRKEY:, refers to a non-existent cipher key.

The counter D-NO-CRKEY (OUTPUT) is incremented every time a DATA frame is received from the upper level, but it is not encryptable because the index of the cryptographic key, set in the parameter CRKEY:, refers to a non-existent cipher key.

D-BAD-CIPH Number of discarded DATA frames because of decryption failure
0 - 4.294.967.295

The counter D-BAD-CIPH (INPUT) is incremented every time a received DATA frame must be discarded because the decryption failed. This can be caused by:

SNMP traps generated for the MLM port top

The SNMP Agent of Abilis CPX is able to generate traps owing to meaningful state changes pertinent either to P-Link or S-Link channel of the MLM.

SNMP traps generated for the P-Link channel of the MLM

The traps listed below are generated when the "T" option is set in the LOG: parameter.

Trap own code Mnemonic of the trap SNMP variables reported in the trap Description
1 cxTrapPLinkDown cxPortIndex,
cxPortType,
cxMlmDiagPLinkState,
cxMlmDiagSLinkState,
sysUpTime		 The SNMP Agent of the Abilis CPX generates this kind of trap every time the P-Link channel of the MLM goes into the DOWN1 state or DOWN2 state.
2 cxTrapPLinkReady cxPortIndex,
cxPortType,
cxMlmDiagPLinkState,
cxMlmDiagSLinkState,
sysUpTime		 The SNMP Agent of the Abilis CPX generates this kind of trap every time the P-Link channel of the MLM leaves the DOWN1 state or DOWN2 state.

SNMP traps generated for the S-Link channel of the MLM

The traps listed below are generated when the "T" option is set in the LOG: parameter.

Trap own code Mnemonic of the trap SNMP variables reported in the trap Description
3 cxTrapSLinkStopped cxPortIndex,
cxPortType,
cxMlmDiagPLinkState,
cxMlmDiagSLinkState,
sysUpTime		 The SNMP Agent of the Abilis CPX generates this kind of trap every time the S-Link channel of the MLM goes into the STOPPED1 state or STOPPED2 state.
4 cxTrapSLinkReady cxPortIndex,
cxPortType,
cxMlmDiagPLinkState,
cxMlmDiagSLinkState,
sysUpTime		 The SNMP Agent of the Abilis CPX generates this kind of trap every time the S-Link channel of the MLM leaves the STOPPED1 state or STOPPED2 state.
5 cxTrapSLinkUSStart cxPortIndex,
cxPortType,
cxMlmDiagPLinkState,
cxMlmDiagSLinkState,
sysUpTime		 The SNMP Agent of the Abilis CPX generates this kind of trap every time the repetition calls procedure, specified in the parameter RTY:, if set to the value "US", starts on the S-Link channel of the MLM port.

Details of the SNMP variables reported in the MLM traps

cxPortIndex FR port, which the SNMP trap refers to
0 - 999

This variable stores the CPX port number, which the SNMP trap refers to.

cxPortType Type and description of the MLM port, which the trap refers to
type - description

This variable reports either the port type which the trap refers to (in this case it will be MLM) and the description that eventually the user can give to the CPX port.

cxMlmDiagPLinkState P-Link channel current state
ready(0), link-not-present(1), link-error(2), down1(3), down2(4)

This variable reports the current state of the P-Link channel, which the trap refers to. The following table shows the relationship between the state values, referred by the SNMP variables, and the states carried out by executing the command D S.

SNMP variable value P-Link channel corresponding state
ready(0) READY
link-not-present(1) LINK-NOT-RESENT
link-error(2) LINK-ERROR
down1(3) DOWN1
down2(4) DOWN2
cxMlmDiagSLinkState S-Link channel current state
ready(0), ready-delay(1), calling(2), called(3), connected(4), clearing(5), cleared(6), link-not-present(7), stopped1(8), stopped2(9), us-delay(10)

This variable reports the current state of the S-Link channel, which the trap refers to. The following table shows the relationship between the state values, referred by the SNMP variables, and the states carried out by executing the command D S.

Value of the SNMP variable Corresponding state of the S-Link channel
ready(0) READY
ready-delay(1) READY-DELAY
calling(2) CALLING
called(3) CALLED
connected(4) CONNECTED
clearing(5) CLEARING
cleared(6) CLEARED
link-not-present(7) LINK-NOT-PRESENT
stopped1(8) STOPPED1
stopped2(9) STOPPED2
us-delay(10) US-DELAY
sysUpTime Elapsed time since the system has been started by the occurred event
0 - 4.294.967.295 or "ddd:hh:mm:ss"

This variable reports the elapsed time (in cents of second) since the occurred event, which has generated the SNMP, started the system. This value is usually shown by using the format days:hours:minutes:seconds.

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