Specifications

Circuit packs, channel service units, and power supplies
224 Hardware Description and Reference for Avaya Communication Manager
TN497 tie trunk (4 ports)
Note:
Note: This circuit pack is no longer sold.
The TN497 tie trunk circuit pack for Italy has four ports for 2-wire tie trunks with loop disconnect
signaling. Each port can be administered for:
● A- or Mu-Law companding timers,
● Translatore Giunzione Unscente (TGU) (outgoing tie),
● Translatore Giunzione Entrante (TGE) (incoming tie), and
● Translatore Giunzione Interno (TGI) (internal tie).
TN556D ISDN-BRI 4-wire S/T-NT interface (12 ports)
The TN556D ISDN-BRI circuit pack has 12 ports that connect to ISDN-BRI terminals. Each port
on a TN556 ISDN-BRI circuit pack has:
● TXT,
● TXR,
● PXT, and
● PXR signal leads.
Up to eight ports can be used for Adjunct Switch Application Interface (ASAI) links. Each port
operates at 192 kbps and has 2 B-channels and 1 D-channel.
The TN556D ISDN-BRI circuit pack has a maximum range of up to 1900 feet (579 meters) from
the system to the telephone when the circuit pack is connected with 24-AWG (0.20 mm
2
/0.51
mm) wire. The TN556D uses standard ANSI T1.605 protocol. Up to 24 terminals can be
connected, where each terminal uses 1 B-channel and shares the D-channel. The TN556 also
has multipoint support. Capacity for the multipoint support depends on the protocol. In countries
that do not support Service Profile Identifier (SPID), there is a limitation of one BRI telephone
per port.
The TN556D ISDN-BRI circuit pack supports A- or Mu-Law companding. The TN556D
ISDN-BRI circuit pack also functions as a trunk when connecting to a TE interface, such as a
TN2185B in another switch. It can be used for lines and trunks simultaneously. The TN556D
ISDN-BRI circuit pack provides end-to-end outpulse signaling when the circuit pack is in
tie-trunk mode with a TN2185B ISDN-BRI S/T-TE interface (4-wire, 8 ports)
.