Section SDSĆ548Ć6LNĆ204
030Ć101328 Rev. A
R
0208I4RA
7
S3
S2
150
600
1200
2W
4W
SUPPLY OFF TERM
S1
TEST
TEST
SDS5486LN ISS.4
XMT RCV F
AIL
ALIGN SC PWR
TEST LPBK
NTEL
i
ORT
P
I
OPTION
POSITION
FUNCTION
OPTION
POSITION
FUNCTION
SUPPLY
Select to have unit supply 20MA of sealing current to simplex leads
S1
OFF
Select to disable internal sealing current circuit
S1
TERM
Select to have unit provide termination for sealing current supplied from disĆ
tant end
1200
Select when interfacing loaded cable facility
S2
600
Select when interfacing short nonĆloaded cable facility
S2
150
Select when interfacing long nonĆloaded cable facility
S3
2W
Select when interfacing 2W data modem equipment
S3
4W
Select when interfacing 4W data modem equipment
TEST
PRESS (LESS THAN 5 SEC.)
Press for less than 5 seconds to activate INTELIPORT's Wire Test Mode.
Press for a second time to end the Wire Test Mode.
Note: The Wire Test Mode automatically times out one hour after initial acĆ
tivation if the TEST switch is not pressed a second time.
TEST
PRESS (MORE THAN 5 SEC.)
Press for more than 5 seconds to activate INTELIPORT AUTOĆALIGN seĆ
quence from onĆsite. (NOTE: This feature is activated only during the first five
minutes of initial powerĆup of the unit.)
Table 3. SDS5486LN Switch Options
Upon completion if no tone is sent during the 20Ćminute time
frame, INTELIPORT, after 20 minutes, sends a rampĆup tone,
drops out of the Quiet Term/Transponder mode and returns to
idle. If release is desired before the 20Ćminute time frame, send
2713Hz for 0.9 seconds minimum to return to command mode.
Detection of a second 2713Hz tone causes INTELIPORT to reĆ
turn to idle.
3.19
Sealing Current
Sealing current is recommended on all metallic facilities to help
prevent transmission path noise. Sealing current is a lowĆvalue
dc current (approximately 20mA) applied to the 4Ćwire dry cable
pairs on a simplex basis to break down resistance, which may
build up at nonĆsoldered cable splices. Continuous application
of sealing current helps prevent degradation of transmission
performance.
The internal Sealing Current circuit is controlled by option
switch S1. Switch S1 can be set to have the unit supply 20mA of
balanced sealing current to the facility's simplex leads (SUPĆ
PLY), provide a termination for sealing current supplied from
the distant end (TERM), or can be disabled (OFF) if sealing curĆ
rent is not required. NOTE: When sealing current is being
supplied from the unit, the simplex leads at the distant end must
be connected together to complete the path. Please also note
that when INTELIPORT is supplying sealing current, a 24 Vac
or Ć24 Vdc power source is adequate for a metallic facility loop
of less than 1000 Ohms. For loops in excess of 1000 Ohms, a Ć48
Vdc power source is recommended.
