Visara SCON-25L Reference Manual - Manual (Page 27)

707028-007 2-17
Chapter 2. Installation
3. Ensure that the host processor/channel is in a stop state.
4. Set switches to Bypass to isolate the unit from the local channel. The Bypass
switch for the BTC-C assembly is located on the V-junction connector of the
Channel Adapter cable (Figure 2-8).
Note: The Bus/Tag cables must remain connected to the BTC-C for the
communication link to remain intact.
5. The host processor/channel may now be removed from the stop state.
6. Local testing and/or service may be performed on the unit.
When testing or service is complete, use the following procedure to return the unit
to service on the channel.
1. Place the host processor/channel in a stop state.
2. Reset the Bypass switch to normal state and set the priority.
3. Place the host processor/channel in a start state.
4. Follow normal power-on procedures.
ESCON Channel Interface
An ESCON Controller (ESC or ESX), a PCI Feature Adaptor (PFA) board with a
Luminex ESCON board permanently connected/mounted in place, provides a single
ESCON Channel communications interface. The ESC provides a single channel
attachment interface for connecting 25S/25L Communication Servers to an ESCON
director or to a mainframe channel. The ESX provides a single channel attachment
interface for connecting 28L/3074 communication servers to an ESCON director
or to a mainframe channel.
The fiber connection from the mainframe to the CARD shall be multimode 62.5/
125 micron cable for distances up to 3 kilometers with no directors, or 9 to 26
kilometers with 2 ESCON directors in series. Multimode 50/125 micron cable
may also be used for distances up to 2 kilometers with no directors, or 6 to 24
kilometers with 2 ESCON directors in series.
Indicators, Switches and Connectors
Indicators, switches and connectors are found on the front and top edge of the
Board. A view of the ESC/ESX faceplate bracket cutout is shown below.
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.