DEFINITY ECS Release 8.2 Maintenance for R8.2csi
555-233-119 Issue 1
April 2000
Maintenance Objects
3-1170UDS1-BD (UDS1 Interface Circuit Pack)
3
The TN464 supports digital Tie, CO, and DID trunks, and OPS lines. On-board
firmware performs call c ontrol signaling for the Tie, CO and DID trunks and OPS
lines. ISDN-PRI trunk and PRI endpoint signaling (Q.921, Q.931) is received and
generated by system so ftware and is transmitted on a system link throug h the
TN1655 Packet Interface and pac ket bus to the UDS1 where it is placed on the
D-channel. Signaling over the DS1 link has to b e synchronized between the
transmitting and receiving ends to ensure error-free communicati on. Refer to
‘‘SYNC (Synchronization)’’ in this chapter for details.
Each trunk, line or endpoint has its own mai ntenance strategy but all d epend on
the health of the UDS1 Interface circuit p ack. Refer to the following sections for
details: TIE-DS1, CO-DS1, DID-DS1, OPS-LINE, ISDN-TRK, ISDN-LNK,
ISDN-SGR, WAE-PT and PE-BCHL. The maintenance strategy for the TN464
UDS1 Interface circuit pac k (UDS1-BD) is very similar to the maintenance
strategy for the TN767 DS1 Interface circuit p ack (DS1-BD). The same
commands are used for ad ministering and testing the boards. The differences in
maintenance strategy betwee n the boards are due to the UDS1 circ uit pack’s
direct interface to the Pack et Bus which is used for ISDN-PRI signaling
(ISDN-LNK). While both the TN464 and TN767 can support ISDN-PRI
B-channels, ISDN-PRI D-channel signaling ap plications require a TN464 UDS1
circuit pack.
The TN464F or later circuit pack combined with the 120A1 CSU Module forms an
Enhanced Integrated CSU. The new 120A1 CSU Module, when c ombined with
the functionality provided by the TN464F hardware and firmware, and new sw itch
software, provides functionality eq uivalent to an external stand-alone Luc ent ESF
T1 CSU. The 120A1 CSU Module connects to the TN464F circuit pack o n the I/O
connector panel on the b ack of the port c arrier. The new CSU Module, thus
becomes an integrated part of the DEFINITY. system. Throughout the document,
the term 120A1 will mean a 120A1 or later suffix CSU Module.
The Enhanced Integrated CSU is for use in the United States of America with
1.544 Mbps DS1 service. For further details on the 120A1 CSU Module see
DEFINITY Communications System Generic 1, Generic 2, and Generic 3 V1 and V2 - Integrated CSU Module Installation and Op eration
.
The TN464F and 120A1 CSU Module support on-demand loopback tests that
assist in the detection of faults b etween the TN464F circuit pack and the CSU
Module, between the Integrate d CSU and the optional Customer Premises
Loopback Jac k, or between the Integrated CSU and remot e CSU. These
loopback tests are exp lained in detail later in this UDS1-BD sec tion, but Fig ure
3-47 gives a high level overview of the loop back point s.