Verilink 1557 (CG) Configuration/Installation Guide Manual do Utilizador descarregar pdf (Página 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

VDC

-48

RAM

ROM

CPU

NET A

NET B

NMS

OUT

NMS

STATUS

SERV SEL

PATH A

PATH B

LOS

ALARM

LOC LP

PLB

LLB

FAULT

LOCK

ALARM

LOC LP

PLB

LLB

ARX

BRX

EQ RX

AUTO

EQUIP

NETBPORT

(SW 1)

PLB

LLB

DSX

LINE

INTER-

FACE

DSX

LINE

INTER-

FACE

LLB

1557

FAC

TRANSPORT

1 2 3 4

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