Hardware manual

Issue 8 Electra Elite
5 - 88 Installing Electronic Telephone Units
5.5.7 Connectors
The VDH2(8)-U( ) ETU has three connectors:
CN1 Connects to the backboard.
CN2 – CH1~7 Connects to Multiline Terminals.
CN2 – CH8 Connects to Multiline Terminal or
cascades to another HUB.
CN3 Connects 10Base-2 cascade
cables from another HUB or
mainframe LAN.
When SW2 is set to X, the following table indicates the pin
assignments for the RJ-45 pins for CN2 ~ CH8.
In the tables below, TD indicates Transmit Data and RD
indicates Receive Data.
When SW2 is set to =, the following table indicates the pin
assignments for the RJ-45 pins for CN2 ~ CH8.
Cables that connect a terminal to a HUB are straight, and
cables that connect HUB-to-HUB are crossed. Coreline
uses straight cables only.
Normal
Pin Signaling
6TD-
3TD+
2 RD-
1 RD+
Cascade
Pin Signaling
6 RD-
3 RD+
2TD-
1TD+