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Page 956 of 1536 Chapter 8 — PRI Maintenance Service message function Service messages are used to monitor the following: — D-channel establishment — D-channel sanity polling — B-channel or ISL status change — Channel status audit. D-channel establishment When the D-channel establishes, the B-channel status is supported by sending service messages for each B-channel controlled by a D-channel. This allows the far end to synchronize its channel states. These services messages are sent when the D-channel is brought up automatically by the system or manually by using LD 96. D-channel sanity polling If a D-channel has been idle for 30 seconds, a service message is sent to poll the sanity of the link. The service message is sent regardless of whether the near end is configured as master or slave. B-channel status change Whenever there is a status change for a B-channel or an ISL channel, the new status is reported to the far end in a service message. Status change can occur through service change or maintenance operations, such as the addition or deletion of a channel in LD 14, or disabling of the associated loop, shelf, card or unit in LD 30, LD 32, LD 36, LD 41 or LD 60. Channel status audit LD 30 is enhanced to allow channel status audit to be initiated. The channels associated with each D-channel are examined and their status is reported to the far end by service messages. Service message commands You activate the service messages in LD 96 on a per D-channel basis. The commands are: — ENL SERV N: turns on the support of service and service acknowledge messages for DCH link N. The command should only be executed when the specified D-channel is in the disabled state. 553-3011-315 Standard 10.0 May 1999
Chapter 8 — PRI Maintenance Page 957 of 1536 — DIS SERV N: turns off the support of service and service acknowledge messages for DCH link N. — STAT SERV (N): displays the current service and service acknowledge message SERV setting for individual DDCH N or for DCHIs. When configuring these messages, the SERV command should only be enabled if both switches are equipped with a minimum of X11 release 15 software. Two new statuses are added for maintenance messages, FE MbSY = Far end maintenance and FE DSBL = Far end disabled. 2 Mb PRI error detection The Primary Rate Interface categorizes errors and alarm conditions into two main groups, Group I and Group II errors. Group I Errors These are real-time calculated error-rate thresholds. Group I errors can include: — Bipolar Violations (BPV) — Frame Bit Errors (FBER) — CRC-4 Word Errors (CRC) — Controlled Frame Slips Bipolar Violations In a alternate mark inversion (AMI) bipolar pulse stream, pulses alternate in polarity. A bipolar violation has occurred when two pulses of the same polarity are received in succession, as shown in Figure 129. This might be caused by an electrical disturbance such as noise, a low signal level or a faulty repeater Bipolar violations give a good indication of the integrity of the local span from the Meridian 1 to the first repeater. The PRI card, following the CEPT PCM-30, uses a zero code suppression technique known as HDB3 which introduces intentional bipolar violations onto the carrier. This is accounted for by the receiver and disregarded as bipolar violation errors. Option 11C 2.0 Mb DTI/PRI Administration and Maintenance guide
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