Studio Technologies IFB Plus 2001 - Manual (Page 46)

Issue 7, November 2001 Model 2 User Guide
Page 46 Studio Technologies, Inc.
Ringing Detection (Telephone Line Mode): 40
to 150V RMS, 18-68Hz, ringer equivalence 0.93
Number of Rings to Answer (Telephone Line
Mode): 1, or a fraction of one ring
Interconnection: mates with standard USOC
RJ11 jack using standard 6-position modular
cable
Interface Protection Fuse: 0.5A, 250V, 2AG,
slow blow, solder-in pigtail type, Littelfuse 230
or equivalent
Disconnect (Telephone Line Mode): manual
using front-panel switch or automatically after
detection of 250mSec, nominal, break in loop
current
Interface Control (Telephone Line Mode):
switch on front panel allows manual off hook
and manual hang-up functions
Audio Routing Control: switch on front panel
allows interface to receive audio, send channel 1
audio, or send channel 2 audio
Receive Audio Level: –15dBu, nominal
Receive Audio Adjustment Range: ±8dB
Send Audio Level: –6dBu, nominal
Indicator Lights: 2, one yellow LED indicates
operation in standard audio mode, one red LED
indicates loop current flowing through interface
Access Station Interface:
Connector Type: 9-pin D-type, female
Application: provides power, audio, control
inputs, and status lamps outputs for up to four
Model 22 Access Stations
Power: +18Vdc, filtered and regulated, current
limited
Audio Inputs: one input per IFB channel,
unbalanced, capacitor coupled, 100k ohm
input impedance, –10dBu nominal audio level
Control Signals: 3, one per IFB channel, one
for monitor mute function, all lines active low
Status Lamp Outputs: one per IFB channel,
9.6Vdc channel inactive, 14.5Vdc channel active,
nominal, current limited
Monitor Output:
Application: designed to drive loads of 8 ohms
or greater
Connector Type: ¼-inch 2-conductor phone jack
Release Threshold: 26dB below nominal input
level over 400-1400Hz band
Detect Time for Valid Signal: less than 1mSec
Release Time after Valid Signal: 350mSec
Telephone Interface:
Operating Modes: telephone line or standard
audio signal, switch selectable
Definition of Telephone Line: intended for
connection to standard loop start telephone lines
Definition of Standard Audio Signal: intended
for connection to balanced or unbalanced audio
signals (no DC loop current)
Impedance (Telephone Line Mode): 700 ohms,
DC off-hook resistance 200 ohms
Impedance (Standard Audio Mode): 700 ohms
Telephone Line Requirements (Telephone Line
Mode): 2-wire, loop start, 10mA loop current
minimum
Interconnection: mates with standard USOC
RJ11 jack using standard 6-position modular
cable
Interface Protection Fuse: 0.5A, 250V, 2AG,
slow blow, solder-in pigtail type, Littelfuse 230
or equivalent
Disconnect (Telephone Line Mode): manual
using front-panel switch or automatically after
detection of 250mSec, nominal, break in loop
current
Interface Control (Telephone Line Mode):
switch on front panel allows manual off-hook
and manual hang-up functions
Receive Audio Level: –15dBu, nominal
Receive Audio Adjustment Range: ±8dB
Indicator Lights: 2, one yellow LED indicates
operation in standard audio mode, one red LED
indicates loop current flowing through interface
Telephone Interface 2:
Operating Modes: telephone line or standard
audio signal, switch selectable
Impedance (Telephone Line Mode): 700 ohms,
DC off-hook resistance 200 ohms
Impedance (Standard Audio Mode): 700 ohms,
receive mode, 2200 ohms send mode
Telephone Line Requirements (Telephone Line
Mode): 2-wire, loop start, 10mA loop current
minimum