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C. Pin Assignments
C-33830-A2-GB91-30 August 1998
Table C-1
(3 of 3)
EIA-232-D Pin Assignments
RS-232
Pin
Circuit
Function
Signal
Source
CCITT
EIA
Circuit
Name
22 R1 CE 125 DCE Ring Indicator
23 CT111 CH 111 DTE Data Rate
Selector
24 XTXC DA 113 DTE External Clock
25 TEST TM 142 DCE Test Mode
VF Connector Pin Assignments
For 2-wire leased-line connections to a JM8 network interface, an
8-position to 6-position conversion cable (see Figure C-1) must be used
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:
(1) 2-wire operations
(2) 4-wire operations w/o TEK leads
(3) 4-wire operations with TEK leads
TEK leads are for loopback purposes.
A 50-pin version is being considered for multiple line connections.”