Справочник Пользователя для Lucent Technologies R5SI
DEFINITY Enterprise Communications Server Release 5
Maintenance and Test for R5vs/si
Maintenance and Test for R5vs/si
555-230-123
Issue 1
April 1997
Packet Bus Fault Isolation and Correction
Page 9-5
Circuit Packs That Use the Packet Bus
9
Circuit Packs That Use the Packet Bus
Four circuit packs can use the packet bus. The following list identifies and
discusses each circuit pack. An explanation of how each circuit pack assists in
packet bus maintenance is also included.
discusses each circuit pack. An explanation of how each circuit pack assists in
packet bus maintenance is also included.
NOTE:
The MOs involved with each circuit pack are listed in brackets.
Documentation for each maintenance object is provided in
The MOs involved with each circuit pack are listed in brackets.
Documentation for each maintenance object is provided in
.
■
TN778 Packet Control
[PKT-CTRL] provides the SPE interface to the
packet bus, just as the TN777 Network Control does to the TDM Bus. All
traffic on the packet bus passes through the packet control.
traffic on the packet bus passes through the packet control.
The packet control can detect failures of certain control leads on the bus.
Such failures are indicated by an inability to transmit data. The packet
control can also detect data errors on the packet bus.
Such failures are indicated by an inability to transmit data. The packet
control can also detect data errors on the packet bus.
■
TN570 Expansion Interface
[EXP-INTF] is used to connect the PNs in the
system. For systems that use the packet bus, all Port Network connections
must be made with TN570 circuit packs. All packet traffic between PNs
passes through a pair of TN570s (one in each port network).
must be made with TN570 circuit packs. All packet traffic between PNs
passes through a pair of TN570s (one in each port network).
The Expansion Interface can detect a subset of control lead failures
(though not as many as the packet control), and it can detect many data
lead failures via parity errors on received data.
(though not as many as the packet control), and it can detect many data
lead failures via parity errors on received data.
■
TN556, TN2198 and TN2208 ISDN-BRI circuit packs
[BRI-BD,
BRI-PORT, ABRI-PORT, BRI-SET, BRI-DAT, ASAI-ADJ] provides
connections for ISDN-BRI station sets and data modules and for ASAI
adjuncts. The Packet Bus is used to carry signaling information for sets
and data modules. The Packet Bus passes signaling information and ASAI
messages between the SPE and the ASAI adjunct. The ISDN-BRI circuit
pack has the same fault detection capabilities as the TN570 Expansion
Interface.
connections for ISDN-BRI station sets and data modules and for ASAI
adjuncts. The Packet Bus is used to carry signaling information for sets
and data modules. The Packet Bus passes signaling information and ASAI
messages between the SPE and the ASAI adjunct. The ISDN-BRI circuit
pack has the same fault detection capabilities as the TN570 Expansion
Interface.
■
TN771D (or later) Maintenance/Test circuit pack
is the workhorse of
packet bus maintenance. This circuit pack can detect all packet bus
failures for the PN in which it resides. In High and Critical Reliability
systems, the circuit pack enables the reconfiguring of the packet bus
around a small number of failed leads. The TN771D circuit pack provides
a standalone mode (that is, one that does not involve communication with
the SPE) for inspecting the packet bus for faults. This is a critical tool for
the packet bus fault correction procedures, which are described later.
failures for the PN in which it resides. In High and Critical Reliability
systems, the circuit pack enables the reconfiguring of the packet bus
around a small number of failed leads. The TN771D circuit pack provides
a standalone mode (that is, one that does not involve communication with
the SPE) for inspecting the packet bus for faults. This is a critical tool for
the packet bus fault correction procedures, which are described later.