DTSTAT

Qualifiers:

READ <unit> <shelf> <slot> <hybrid>

READ <unit> <shelf> <slot> <hybrid> LAST <number of hours>

CLEAR <unit> <shelf> <slot> <hybrid>

Purpose:

Lists or erases statistics on any of the Channel Associated Signaling (CAS) or Common Channel Signaling (CCS) digital links connected to a system.

Details:

The READ qualifier specifies that the contents of the DTSTAT memory assigned to the link are to be read.

The CLEAR qualifier erases the statistics for the specified digital link.

The <unit> <shelf> <slot> <hybrid> qualifier specifies the physical location of the link.

The LAST <number of hours> qualifier specifies the number of past hours the report will cover. The value entered can be digits in the range 1 through 24. When "LAST" is not specified the report will cover the events within the portion of hour prior to the command being entered. For example, if the command is entered at 16:33, then the report will cover the period 16:00 to 16:33.  If during a READ no LAST parameter is specified, only a "snapshot" is retrieved. If during a CLEAR no LAST parameter is specified, all records gathered in the previous 24 hours are cleared.

On the SUPERCONSOLE 1000, this command is found under the REPORTS group of commands.

DTSTAT Command Field Names Description

Field Name

Description

AVERAGE RETRANS

Indicates the average number of transmissions required to send one message.  For example, if 100 transmissions are required to send 50 messages, then the average number of transmissions per message is 2. See Note 2.

BIT ERROR RATE

Indicates the Bit Error Rate, in units of 10**-6. The link is taken out of service when the bit error rate service threshold or 1x10**-3 is exceeded.

CONGESTION

Indicates the number of times during the specified time frame that a call state transition is not allowed due to congestion at the far end office. See Note 2.

CRC ERROR

Indicates the number of messages received with Cyclic Redundancy Check (CRC) errors during the specified time frame. See Note 2.

DUTY CYCLE %

Indicates the percentage of time that the link was perceived by the system as usable. To be perceived as being usable the following conditions must be true:

  • The sync. signal is present.

  • The 12V DC power is present.

  • The bit error rate does not exceed the bit error rate service threshold.

  • The slip rate does not exceed the slip rate service threshold.

  • The framing loss rate does not exceed the framing loss rate service threshold.

  • No far end alarm is present.

  • Note: On the PRI card, if the link has never been plugged in, the duty cycle will count down from 100% to 0 throughout the hour, or until the link is plugged in. After the link is plugged in, the duty cycle will start to count back up.

FRAMING LOSSES

Indicates the number of times the link was out of sync for periods not sufficient to qualify as "logically" out of sync. When the framing loss rate exceeds the maintenance threshold, a log is produced. When the framing loss rate exceeds the service threshold, a log is produced and the link is taken out of service (not seizable).

  • Note: The maximum number of framing losses is 32767. After this number is reached, the loss count restarts at 0.

LEVEL 2 RESETS

Indicates the number of times the link layer has been reset. See  Note 2.

MAX RETRANS

Indicates the number of messages that could not be transmitted after 64 attempts. See Note 2.

MODE RETRANS

Indicates the most frequent number of transmissions required to send messages. For example, if from 20 messages the number of transmissions required to send each of 14 was 5, then the Transmission Per Message Mode is 5. See Note 2.

SLIPS

Specifies the slip rate, that is, the number of times the clock rate of the incoming data differs from the clock rate of the clock source. When the slip rate exceeds the maintenance threshold a log is produced. When the slip rate exceeds the service slip rate threshold, a log is produced and the link is taken out of service (not seizable).

TIME

Specifies the time, date, and month. The time is specified in hours and minutes using the 24-hour format. The statistics provided are for the hour ending xx where xx is the hour shown on the report.

  • Notes:

  1. The totals for the slip rate and the framing loss rate are accumulated automatically over a 24-hour period. If these totals exceed the maintenance thresholds a maintenance log entry is generated. If the totals exceed the service thresholds the link is taken out of service and the DTSTAT CLEAR command is needed to reset the STATS (so that the slip rates and framing loss rates are recalculated on the hour). The link will then be returned to service.

  2. The following fields will appear only when the <DPNSS> qualifiers are used:

    • LEVEL 2 RESETS

    • MAX RETRANS

    • CRC ERROR

    • AVERAGE RETRANS

    • MODE RETRANS

    • CONGESTION

 

DTSTAT Link Status Messages

Status Line

Description

Link is available

The presence of synchronization and 12 V power is confirmed, diagnostics were successful, and there are no alarms operated. The following are some of the reasons why the circuits may not be in the state IDLE:

• The Address for Message Control may be programmed to the same code

• The far end may not be responding to signaling, even if synchronization is available.

Link is not available, absence of 12 V power.

12 V power from the backplane is required to drive the digital link. When 12 V power is absent, synchronization and alarms cannot be determined. All statistics fields are filled with zeros.

Link is not available, relay test failed

The physical connection to the digital link may be lost, causing synchronization and alarms to be unavailable, due to a faulty relay on the card. All statistics fields are filled with zeros.

Link is not available, sync not present

No hardware problems are detected, and 12 V power is present. Alarms cannot be detected without synchronization. The hybrid attempts an alarm transmission to the far end, indicating the loss of link.

Link is not available, receiving alarm

No hardware or synchronization problems are detected, and 12 V power is present, but the far end is experiencing difficulties in communicating with the link, as evidenced by the received alarm.

Link is not available, bit error rate bad

The bipolar rate violation of the incoming signal is greater than 1 in 1000, causing communications to stop and an alarm to be sent to the far end. No hardware or synchronization problems are detected, 12 V power is present, and no alarms are being received.

Link is not available, 24 hr bit error rate exceeded

The 24 hour bit error rate limit that was programmed is exceeded. The command should be reissued for several hours to determine a trend. The 24 hour data that was reported is cleared by invoking the DTSTAT CLEAR command.

Link is not available, 24 hr framing loss exceeded

The 24 hour framing loss limit that was programmed is exceeded. The command should be reissued for several hours to determine a trend. The 24 hour data that was reported is cleared by invoking the DTSTAT CLEAR command.

Link is not available, 24 hr slip rate exceeded

The 24 hour slip rate limit that was programmed is exceeded. The command should be reissued for several hours to determine a trend. Check the NETSYNC information to determine if a faulty network synchronization is the cause of the problem. The 24 hour data that was reported is cleared by invoking the DTSTAT CLEAR command.

Link is not available, repeated loss of service on link

There are no hardware problems and the 12 V power is present, but the signal that is received from the digital link is faulty. An alarm is transmitted to the far end. This condition is defined as 'bouncy' and requires that the link be removed from service until it recovers stability; stability could be recovered in a few seconds. The DTSTAT command is used to determine the current status of the link, and the proportion of time that it has been out of service. When the link passes diagnostic tests and is returned to service, the alarm is removed from the link.

Link is not available, hybrid not programmed

The hybrid requires an assignment in the Digital Links form. All statistics fields are filled with zeros.

Link is not available, loss of multi-frame alignment

Two consecutive wrong multi-frame signals have been received. The maintenance log should be checked to determine the source(s) of the fault.

Link is not available, receiving loss of multi-frame

The far end is reporting loss of multi-frame alignment.

Example:

Entry: DTS READ 7 1 1 1 LAST 2

System Response:

Universal T1 7 1 1 1

Link is Available

 

 

Time

duty

cycle

(%)

 

framing

losses

 

 

slips

bit

error

rate

13:50

100

0

0

0

13:00

100

0

12

0

12:00

100

0

13

0