Digicom 3910, 3911 operation manual Position Plug PIN no

Pin Assignments

For 2-wire leased-line connections to a JM8 network interface, use an 8-position to 6-position crossover cable (Figure C-3) according to the following FCC requirements:

“The RJ series of jacks should not be used for connecting data equipment to nonswitched private line networks — specifically, the service equivalents of the pre-divestiture Series 3002 (Category II, Tariff #260) service. There is a substantial difference in transmit levels permitted in the private line service and those permitted in the public switched network. The industry standard is now an 8-pin keyed modular jack known as the USOC JM8 (Bellcore Technical Reference: TR-EOP-000242, Issue 1, released May 1985.) When ordering the installation of the USOC JM8, specify the appropriate wiring options:

•2-wire operations

•4-wire operations w/o TEK leads

•4-wire operations with TEK leads

TEK leads are for loopback purposes.

A 50-pin version is being considered for multiple line connections.”

8-POSITION

PLUG PIN NO.

	6-POSITION
1	PLUG PIN NO.
2	1
3	2
4	3
5	4
6	5
7	6
8

Figure C-3. Wiring Diagram — 8-Position to 6-Position Crossover Cable

3910-A2-GN32-40 September 1998 C-5