DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126 Issue 4
June 1999
Maintenance Object Repair Procedures
9-1825UDS1-BD (UDS1 Interface Circuit Pack)
9
■PRI endpoint ports (PE-BCHL) and accomp anying signaling c hannel
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 software an d is transmitted on a system link through the
TN1655 Packet Interface and pac ket bus to the UDS1 where it is placed o n the
D-channel. Signaling over the DS1 link has to b e synchronized between the
transmitting and receiving ends to ensure error-free communication. Refer to
‘‘SYNC (Synchronization)’’ in this chapter for details.
Each trunk, line or endpoint has its own mainte nance 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 b oards. The differences in
maintenance strategy betwee n the boards are due to the UDS1 circuit p ack’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 switc h
software, provides functionality eq uivalent to an external stand-alone Lucent ESF
T1 CSU. The 120A1 CSU Module connects to the TN464F circuit pack on th e I/O
connector panel on the b ack of the port carrie r. 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 Americ a 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 Jack , or between the Integrated CSU and remote CSU. These
loopback tests are exp lained in detail later in this UDS1-BD section, b ut Figur e
9-110 gives a high level overview of the loop back points.