Indicators, switches and connectors, Attaching the esc interface to the channel, Connectors – Visara SCON-20L Reference Manual User Manual
Page 15: Debug sw, Indicators, Actv (green), Fail/err (amber), Irq (amber), Onln (green), Switches
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Chapter 2. Installation
Indicators, Switches and Connectors
Indicators, switches and connectors are found on the front and top edge of the Board.
See Figure 2-2 for a view of the ESC faceplate bracket.
Indicators
IRQ (amber) – This is the Interrupt Request LED. When the ESCON card generates an
interrupt to the PFA PCI host card, this LED will be lit. When the PCI host acknowledges
the interrupt, the LED is turned off.
ACTV(green) – This LED is lit when the Channel Fiber Optic Interface is actively
communicating on the channel.
ONLN (green) – This is the ONLINE LED. This LED is lit when the Channel Interface
is logically connected to the channel. The Channel Interface must be on-line to respond
to selections by the mainframe. The Channel Interface cannot go on-line if the channel
is disconnected or down.
FAIL/ERR (amber) – This is the FAIL LED. This LED is lit at power up, but goes off
within 5 seconds if the Power-up Self-Test (POST) passes. During normal operation
this LED is lit if the receive ESCON signal is not present or is invalid.
Switches
Debug SW – Recessed push-button switch. Pressing this switch causes the on-board
code to enter a special debug mode (monitor). The debug mode should only be used
under the direction of a Visara Engineer. If the debug mode is entered, the board will no
longer operate normally on the channel. If the debug switch is accidentally pressed, the
ESCON card should be reinitialized.
Note:
Reinitializing the ESCON card may require the 20L/22L to be IML’ed.
Connectors
Fiber Optic Transceiver – This connector is used for attachment of ESCON fiber
optic cable.
Attaching the ESC Interface to the Channel
Follow the steps below to connect an ESCON cable between the ESCON host channel
and the 20L/22L:
1. Vary “offline” the host channel that will attach to this ESC. Refer to your mainframe
operating system manuals for instructions.
2. Connect an ESCON fiber optic cable between the 20L/22L Console Concentrator
and the host or ESCON Director.