
TRANSPORT
®
1558A APS
Configuration Guide
Part Number 45-00083
Revision 2.0
1558A Front View
AUTO T1 PROTECTION SWITCH
A
SUPV PWR
B
STATUS
ABYPASS LOCKED B
A
B
ALM LOS LP
A
SELECT
AUTO
PATH
B
STATUS
PATH
RX BRDG
TX BRDG
N
E
T
A
RX BRDG
TX BRDG
N
E
T
B
DTE
LOS
RX BRDG
TX BRDG
D
T
E
TxPORT 1558A
LP
-20 to -56 VDC, 200 MA
S1
DTE COM BUSNET BNET A
IN OUT
GND
–VDC (A)
RTN (A)
–VDC (B)
RTN (B)
Alarm NO
Common
Alarm NC
S2 S3 S4
Switch S1
S1-7 S1-8 Boot from
Off
Off Switches
Off On Manager
On Off RAM
On On ROM
DTE to NET
Block FDL
NET to DTE
Block FDL
DTE to NET
Regen CRC
NET to DTE
Regen CRC
Card Function
Slave
ARM
from ROM
DTE to NET
Pass FDL
NET to DTE
Pass FDL
DTE to NET
Pass CRC
NET to DTE
Pass CRC
Card Function
Master
ARM
from RAM
12345678
Boot Mode
Boot Mode
On
Off
12345678
Framing Errors
Enabled
LOS
Enabled
NET A
B8ZS
NET B
B8ZS
DTE
B8ZS
CSU Mode
Framing Errors
Disabled
LOS
Disabled
NET A
AMI
NET B
AMI
DTE
AMI
Path Revert
Disabled
DTE Framing
ESF
CSU Mode
Path Revert
Enabled
DTE Framing
D4
Enabled
Disabled
On
Off
Switch S2
1558A Rear View
1558A Controls and Indicators
Index Indicator Description
1 SUPV The Supervisory port allows the user to connect to the 1558A via a PC running the supplied LAPS software.
2 Power One or both of these green LEDs will be ON when a nominal power source of -20 to -56 VDC is present on the PWR A and PWR B terminals.
3 Bypass This red LED indicates whether the unit is in a ‘bypass’ mode of operation (ON if the unit has detected a CPU watchdog operational fault and OFF
under normal operation.
4 Locked When the 1558A has been manually forced to either the A or B path, this amber LED is on. Moving the Path Select switch back to the AUTO
position turns off this LED and restores normal APS operation.
5 A / B These amber status LEDs indicate which of the two T1 receive paths (A or B) is presently being utilized
6 Path Select
Auto/A/B
The user can manually force and lock either the A or B path as the active path by moving this switch from the AUTO position to either the A or
B position. The 1558A is now manually locked to this path and will not switch from it, even if the selected path is or will be in a failed state.
7 Alarm These red LEDs indicate that the user definable alarm parameters (ES, CSES, LOS, and LOF) have been met or exceeded for Path A or Path B.
8 LOS This amber LED indicates that no T1 pulses are being detected on the receive signal paths from the network for Path A or Path B.
9 Loop This amber LED indicates that a loop has been activated for Path A or Path B.
10 Test Jacks Bantam test access jacks and bridge/monitor jacks are provided to gain physical access to the T1 path for NET A, NET B, and the T1 DTE path.
11 Loop/LOS The amber ‘Loop’ LED indicates that a loop has been activated on the DTE. The red ‘LOS’ LED indicates a loss of signal on the DTE.
NOTE: For future reference, all DIP switches
on this sheet are provided with boxes to check
according to the particular user selection. Facto-
ry default settings are shown underlined
.
Switches S3 and S4 are shown on the back side.
1 2 3 4 5 6 7 8 9 10 10 11 10
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