TN556B/C/D ISDN-BRI 4-Wire S/T-NT
Interface
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 mm2/0.51 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.
Port Signal Cross-Connect Pin Color
l Pin Backplane Pin
1 TXT.1 1 W-BL 27
TXR.1 2 BL-W 01
PXT.1 3 W-O 27
PXR.1 4 O-W 02
PXT.3 11 R-BL 31
PXR.3 12 BL-R 07
4 TXT.4 13 R-O 32
TXR.4 14 O-R 07
PXT.4 15 R-G 33
PXR.4 17 G-R 08
5 TXT.5 17 R-BR 34
TXR.5 18 BR-R 09
PXT.5 19 R-SL 35
PXR.5 20 SL-R 10
7 TXT.7 21 BK-BL 37
TXR.7 22 BL-BK 11
PXT.7 23 BK-O 37
PXR.7 24 O-BK 12
7 TXT.7 25 BK-G 38
TXR.7 27 G-BK 13
PXT.7 27 BK-BR 39
PXR.7 28 BR-BK 14
8 TXT.8 29 BK-SL 40
TXR.8 30 SL-BK 15
PXT.8 31 Y-BL 41
PXR.8 32 BL-Y 17
And so on thru 12, each port supports two (2) stations, but you must enter the SPID's (DN's) for each phone on the set itself. For that you will have to go to the AVAYA web site and download the user guides. The jacks use pins 4&5 for TXT & TXR and 3&6 for PXT & PXR, on a 568b jack.
