Motorola and V.32bis - Manual (Page 218)

C-38 Country-Specific Information
Countr
y
-S
pecific
Infor
m
a
ti
on
Dial Line Jack Types
The Federal Communication Commission (FCC) is a telecommunications and
standards organization that specifies a series of registered jacks for use with a dial
line network or General Switched Telephone Network (sometimes referred to as
PSTN). These jacks are designated as RJxxx-type jacks, where RJ means Registered
Jack and xxx specifies the jack series. For example, RJ11 indicates a registered jack
from series 11. Sometimes the jack designation is followed by a letter (RJ11C) that
indicates the jack housing style. Jacks specified under FCC Part 68 fit into one of the
following categories: Permissive (voice) or Programmable (data).
6-Pin Voice Jack (Permissive)
This jack type primarily allows voice signals transmitted across lines designated for
voice transmission. This jack type also allows data signals to be transmitted across
voice-grade lines.
8-Pin Data Jack (Programmable)
This jack type is designed to ensure voiceband data transmission integrity across an
interface cable. The jack is referred to as “programmable” because it contains a
resistor that allows the phone company to adjust for the optimum output power level
before the DCE is connected to the line. The following jack types can be used with
your modem.
Jack Type Description
RJ11C This 6-pin modular jack type is the most common permissive data mode (voice) jack
arrangement found in the home or office. This jack operates on a single-line bridged
tip-and-ring voice or low-speed data application service.
RJ16C This 6-pin modular jack type is a special permissive data mode jack arrangement that
allows use of an exclusion-key telephone.
RJ45S This 8-pin modular jack type is the most common programmable data mode (data) jack
arrangement; it permits the use of an exclusion-key telephone. This jack also operates
on a single-line bridged tip-and-ring voice or low-speed data application service.
RJ4MB This 8-pin modular programmable data mode jack arrangement supports Make Busy
operation. Using this jack type, you can make the modem appear to be off-hook to the
central telephone office.
NOTE: Jack type is defined to the modem using the Telco option in the TELCO OPT’S menu. For
details, refer to “Declaring The Jack Type” section later in this appendix.