Verilink 1557 (CG) Configuration/Installation Guide User Manual
Page 4
1557 Controls and Indicators
Index
Indicator
Description
STATUS
1
FAULT
Indicates that the APS card has failed. Comes on briefly at power-up. (Yellow)
2
LOCK
Indicates that the current path is ‘locked’ by the select switch or software command. (Yellow)
3
A
Indicates that path A is carrying service. (Green)
4
B
Indicates that path B is carrying service. (Green)
5
SERV SEL
AUTO/A/ B
Moving this switch momentarily to A or B selects that line to carry service. Leaving the switch on A or B locks service to the
chosen line. This switch overrides all other commands. In normal operation, this switch should be left in the AUTO position.
PATH A /B
6
ALARM
Indicates that the path is in alarm OR that an alarm condition has been cleared but the Line Availability Timer is running.
In either case, the path is NOT available for service. (Yellow)
7
PLB
Indicates that the Payload Loop for the path is active. (Yellow)
8
LLB
Indicates that the Line Loop for the path is active. (Yellow)
9
LOC LP
Indicates that the Local Facility Loop for the path is active. (Yellow)
LOS
10
A RX
Indicates that no signal is being received from Path A. (Yellow)
11
B RX
Indicates that no signal is being received from Path B. (Yellow)
12
EQ RX
Indicates that no signal is being received from the DTE. (Yellow)
MISC.
13
Bus Activity
When flashes occur 2 -3 seconds apart, indicates that messages are being received on the internal data bus.
14
Control Port
This port jack currently has no function.
APS
SELECT
PATH A/B
DSX
LINE
INTERFACE
DEFRAMER
POWER
5/12 VDC
ONE’S
DENSITY
SIGNAL
SPLIT
FRAMER
ALARM
NET A PORT
(SW 2)
LOOP
SET/RESET
BERT
PERFORMANCE/
ALARMS
DTE PORT
(SW 3)
DEFRAMER
FRAMER
DEFRAMER
FRAMER
1557 Block Diagram
A
B
A
B
VDC
- 48
RAM
ROM
CPU
NET A
NET B
IN
NMS
OUT
NMS
11
10
12
13
14
9
8
7
6
9
8
7
6
5
4
3
2
1
STATUS
SERV SEL
PATH A
PATH B
LOS
ALARM
LOC LP
PLB
LLB
FAULT
B
LOCK
A
ALARM
LOC LP
PLB
LLB
A RX
B RX
EQ RX
A
AUTO
B
EQUIP
NET B PORT
(SW 1)
PLB
PLB
LLB
DSX
LINE
INTER-
FACE
DSX
LINE
INTER-
FACE
LLB
1557
EQ
LB
FAC
LB
FAC
LB
6
1
T
R
A
N
S
P
O
R
T
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