Although the documentation of the Cisco Catalyst 6608 line card refers the to the T1/E1 port as an RJ48 interface, the service provider may sometimes refer to it as the T1/E1 line and a RJ45 interface since the connectors are almost the same.
As long as the telephone company service provider is referring this to the T1/E1 line (by either name), it is safe to connect the port to the provider's interface with a patch cord (even a RJ45 patch cord will do) as both these connectors have eight wires.
RJ48 is usually referred to the T1/E1 lines and RJ45 is commonly used in the LAN segments. The other main differences between the two are the following:
RJ48 has a keyed connector and a notched jack.
RJ45 does not have a key or a notch.
Both have eight pins.
Although an RJ45 connector fits in an RJ48 jack, the key on an RJ48 connector prevents it from plugging into an RJ45 jack.
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