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DEFINITY Made Easy Tools
Issue 2, November 2000
DEFINITY Hardware
TN556B/C/D
The TN556 has 12 ports connecting to ISDN-BRI terminals. Each port on a TN556 has TXT, TXR, PXT, and PXR signal leads. Up to 8 ports can be used for adjunct switch application interface (ASAI) links. Each port operates at 192 kbps per second and has 2 B-channels and 1 D-channel (not used to carry data).
The TN556 has a range of up to 1900 feet (579 m) maximum from the system to the voice terminal using 24 AWG (0.20 mm 2/0.51 mm) wire, and uses standard ANSI T1.605 protocol. The TN556 also has multipoint support; 24 terminals can be connected, where each terminal uses 1 B-channel and shares the D-channel. In multi-support applications, 2 voice terminals, or 1 voice terminal and 1 data terminal, or 2 data terminals can connect to each port.
The TN556 circuit pack supports A-Law or µ-Law companding. The TN556 also functions as a trunk, connecting to a TE interface (example: a TN2185 in another DEFINITY ECS). It can be used for lines and trunks simultaneously (on the same circuit pack).
TN556C circuit packs are required for ISDN BRI service under R7 or later csi.
TN556D circuit packs provide end-to-end outpulse signaling when the circuit pack is in tie-trunk mode with a TN2185B.
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| Copyright� 2000 Avaya Inc |
| Send comments to MadeEasy Development Team |
| Always check at the Made Easy Web site for the most current information. |