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Pin Assignments
C-53920-A2-GN31-30 November 1996
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 pr
e-divestitur
e Series 3002
(Category II, T
ariff #260) service. There is a substantial differ
ence in transmit levels
permitted in the private line service and those permitted in the public switched network. The
industry standar
d is now an 8-pin keyed modular jack known as the USOC JM8 (Bellcor
e
T
echnical Refer
ence: TR-EOP-000242, Issue 1, released May 1985.) When or
dering the
installation of the USOC JM8, specify the appr
opriate wiring options:
• 2-wir
e operations
• 4-wir
e operations w/o TEK leads
• 4-wir
e operations with TEK leads
TEK leads ar
e for loopback purposes.
A 50-pin version is being consider
ed for multiple line connections.”
1
2
3
4
5
6
7
8
1
2
3
4
5
6
8-POSITION
PLUG PIN NO.
6-POSITION
PLUG PIN NO.
Figure C-3. Wiring Diagram — 8-Position to 6-Position Crossover Cable