Avaya 03-300430 User Manual

The TN464 supports digital Tie, CO, and DID trunks, and OPS lines. On-board firmware 
performs call control 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 and 
is transmitted on a system link through the TN1655 Packet Interface and packet bus to the 
UDS1 where it is placed on the D channel. Signaling over the DS1 link has to be synchronized 
between the transmitting and receiving ends to ensure error-free communication. See 

on page 2143 in this MO for details.

Each trunk, line, or endpoint has its own maintenance strategy, but all depend on the health of 
the UDS1 Interface circuit pack. See the following Maintenance Objects for details: 

on page 1423, 

on page 2531 and 

The DS1 configuration for each circuit pack is administered on the DS1 Circuit Pack screen. Bit 
Rate is set to 1.544 Mbps for 24-channel systems, and 2.048 Mbps for 32-channel systems. 
Country Protocol is used to drive layer-3 protocol decisions based on PRI specifications for a 
given country (not those related to specific features). Different UDS1 circuit packs may be 
administered with different Country Protocols, allowing the switch to act as a gateway between 
two incompatible ISDN-PRI implementations (for example, between two different countries). US 
systems use country protocol 1. 
Set Near-End CSU Type to other for no CSU installed or for an external CSU such as an ESF 
T1 CSU, or set to integrated for the 120A1 CSU module or the 401A T1 sync splitter. Setting 
the field to integrated causes additional fields to appear for administering the Enhanced 
Integrated CSU module. Set E1 Sync-Splitter to y if a 402A or 403A E1 sync splitter is used to 

provide timing to an ATM switch. Set Echo Cancellation to y if the echo cancellation 
right-to-use feature is enabled and the TN464GP/TN2464BP or higher suffix board is to supply 
echo cancellation. 

Note:

Set the Echo Cancellation Plan on the EC Configuration field of the DS1 
Circuit Pack screen. Note that Plan 1 uses a 96-ms echo tail and introduces 6dB 
of loss for additional cancellation.

In addition, other fields define such parameters as framing modes, line coding, companding 
mode and so on. For further details refer to DEFINITY® Communications System Generic 1, 
Generic 2 and Generic 3 V1 and 2 – Integrated Channel Service Unit (CSU) Module Installation 
and Operation, 555-230-193.