Nortel Meridian 1 Option 11C Manual page 49

Table 8
Maintenance messages
Message
DTA
DTC
DTI
PRI
Message descriptions
Maintenance messages provide near and far end switch status. Both service
and service acknowledge messages are supported on PRI B-channels and ISL
channels.
Service and service acknowledge messages for B-channels and ISL channels
are supported between:
• Meridian 1 to Meridian 1: ISL and PRI
• Meridian 1 to DMS-100: PRI only
• Meridian 1 to DMS-250: PRI only
• Meridian 1 to AT&T ESS4 and ESS5: PRI only
The status reported by the service and service acknowledge messages for
B-channels and ISL channels are:
• in-service
• maintenance
• out-of-service.
Near-end and far-end sub-categories are defined for each maintenance status.
See the table below for possible combinations of near-end and far-end
statuses, and the channel capability for each status. When the near-end and
far-end status does not match, the more severe maintenance status takes effect
over the less severe maintenance status.
DTI/PRI Maintenance
Meaning
Digital Trunk Alarms (Resident Monitor)
Resident CC Monitor
Digital Trunk Interface and CC (LD60)
Primary Rate Interface
Page 49 of 100
Option 11C 1.5 Mb DTI/PRI