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D-2
Cisco Unified IP Phone 7975G Administration Guide for Cisco Unified Communications Manager 6.1
OL-14640-01
Appendix D Technical Specifications
Cable Specifications
Cable Specifications
RJ-9 jack (4-conductor) for handset and headset connection.
RJ-45 jack for the LAN 10/100/1000BaseT connection (labeled 10/100/1000 SW).
RJ-45 jack for a second 10/100/1000BaseT compliant connection (labeled 10/100/1000 PC).
48-volt power connector.
Network and Access Port Pinouts
Although both the network and access ports are used for network connectivity, they serve different
purposes and have different port pinouts.
The network port is labeled 10/100/1000 SW on the Cisco Unified IP Phone.
The access port is labeled 10/100/1000 PC on the Cisco Unified IP Phone.
Network Port Connector
Table D-2 describes the network port connector pinouts.
Ta b l e D-2 Network Port Connector Pinouts
Pin Number Function
1 BI_DA+
2 BI_DA-
3 BI_DB+
4 BI_DC+
5 BI_DC-
6 BI_DB-
7 BI_DD+
8 BI_DD-
Note “BI” stands for bi-directional, while DA, DB, DC and DD stand for
“Data A”, “Data B”, “Data C” and “Data D”, respectively.
Access Port Connector
Table D-3 describes the access port connector pinouts.
Ta b l e D-3 Access Port Connector Pinouts
Pin Number Function
1 BI_DB+
2 BI_DB-
3 BI_DA+
4 BI_DD+
5 BI_DD-
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