PI-BD (Processor Interface Circuit Pack)
Issue 4 May 2002
10-1223
555-233-123
PI-BD (Processor Interface Circuit
Pack)
The TN765 Processor Interface (PI) circuit pack provides a front-end processor to
the TN777 Processor circuit pack. The PI circuit pack implements the packet layer
and link layer of the X.25 protocol (DCS, AUDIX, CMS, OCM links) as well as the
link layer of the ISDN-PRI protocol (ISDN links). A system without high or critical
reliability supports up to two circuit packs. A high or critical reliability system
supports up to four Processor Interface circuit packs, two in each carrier. Only one
pair of the circuit packs on a single carrier can be active at a given time. The other
two are in Standby mode. The TN765 is a downloadable circuit pack. This means
that at reboot, system power-up, or via system technician command, Processor
Interface firmware is downloaded to the circuit pack. For other restarts, a
Checksum Test is performed on the firmware. If the Checksum Test fails, then the
firmware is downloaded again. The firmware can be automatically downloaded at
any time using the reset interface PCS system technician command.
On the Active SPE complex or in an unduplicated system, Processor Interface
maintenance is used for alarming the circuit pack. If System Communication
Interface (PI-SCI) finds an error or alarm condition that can be associated with an
on-board problem with the Processor Interface (PI-BD) circuit pack, then it alarms
both the System Communication Interface and the Processor Interface circuit
pack. Processor Interface circuit pack maintenance is also used to test the
common circuit pack functions on the circuit pack. If these tests fail, a circuit pack
level alarm is raised on the Processor Interface circuit pack (PI-BD). Port level
alarms are raised against PI-PT. See PI-PT (Processor Interface Port)
Maintenance documentation for details.
On the Standby SPE complex, the testing of the Processor Interface circuit pack
is different. The Standby Processor Interface circuit pack is tested daily via
scheduled maintenance or on system technician demand. These tests are to
check the Standby PIs hardware and firmware so that if an SPE interchange takes
place, the Processor Interface communication links (DCS, ISDN, or AUDIX, for
example) recover on the new Active Processor Interface circuit pack in a short
time. If the firmware checksum fails during scheduled maintenance, then the
circuit pack can be downloaded again at this time instead of during the SPE
MO Name
(in Alarm
Log)
Alarm
Level
Initial Command to
Run
1
1
Where P is the port network number (1 for PPN only); C is the carrier designation (for
example, A or B for processor complex circuit packs); and S is the address of the slot in
the carrier where the circuit pack is located (for example, 1 or 2 for either the first or
second Processor Interface circuit packs).
Full Name of MO
PI-BD
MINOR
test interface PCS sh
Processor Interface Circuit Pack
PI-BD
WARNING
test interface PCS sh
Processor Interface Circuit Pack
Summary of Contents for Definity SI
Page 1: ...0DLQWHQDQFH IRU YD D 1 7 6HUYHU 6 Volumes 1 2 and 3 555 233 123 Issue 4 May 2002...
Page 62: ...Maintenance Architecture 555 233 123 1 26 Issue 4 May 2002...
Page 92: ...Management Terminals 555 233 123 3 26 Issue 4 May 2002...
Page 204: ...Routine Maintenance Procedures 555 233 123 5 100 Issue 4 May 2002...
Page 250: ...LED Interpretation 555 233 123 7 10 Issue 4 May 2002...
Page 2804: ...Maintenance Object Repair Procedures 555 233 123 10 2018 Issue 4 May 2002...