SpectraLink Corporation
LinkPlus Interface Guide
Avaya DEFINITY Communications System
Part Number: 72-0171-01-B.doc
Page 10
3.1 DEFINITY Four-Wire Interface
The DEFINITY TN754B (any vintage) or TN754 (vintage 11 or higher) circuit pack
provides eight, four-wire digital station circuits. Two of these wires are used for
transmit, two are used for receive. Typically the stations are wired to a block or to a
patch panel. From the block or patch panel the stations are wired to a modular jack. The
jack can connect to a short patch cord that connects to the MCU. The following table
shows the Avaya side of the block or patch panel wiring.
Pair Function
1
2
Receive Station 1
3
Transmit Station 1
4
5
Receive Station 2
6
Transmit Station 2
7
8
Receive Station 3
9
Transmit Station 3
10
11
Receive Station 4
12
Transmit Station 4
13
14
Receive Station 5
15
Transmit Station 5
16
17
Receive Station 6
18
Transmit Station 6
19
20
Receive Station 7
21
Transmit Station 7
22
23
Receive Station 8
24
Transmit Station 8
25
See the documentation
for your SpectraLink components for more information about
wiring the demarc block or patch panel.
