director 2/64 service manual

director 2/64 service manual 3–35
Repair Information
18. Remove loopback plugs from the tested ports.
19. Reconnect fiber-optic jumper cables from devices to tested ports.
Channel Wrap Test (S/390 only)
A channel wrap test is a diagnostic procedure that checks S/390 host-to-director link
connectivity by returning the output of the host as input. The test is host-initiated, and
transmits ECHO extended link service (ELS) command frames to a director port
enabled for channel wrapping. The director port echoes the frames back to the host.
To perform a channel wrap test for a director-attached host:
1. Notify the customer a disruptive channel wrap test will be performed on the
host-to-director FICON link.
2. At the HAFM server, open the HAFM application. The Products View displays.
a. Double-click the icon representing the director for which the channel wrap
test will be configured. The Hardware View for the selected director
displays.
b. At the Hardware View, verify the location of the port to be configured for the
channel wrap test. When the mouse cursor is passed over a graphical UPM
card on the front view of the director, the card highlights with a blue border
and a pop-up displays with the following information:
— Port card type (UPM).
— Chassis slot number (0 through 15 inclusive).
— The four consecutive port numbers on the selected card. Valid port
numbers are in the range of 0 through 63 inclusive.
c. Double-click the UPM card with the port to be configured. The Port Card
View for the selected card displays.
d. Right-click the port to be configured, then choose Channel Wrap from the
menu. The Channel Wrap On for Port n (where n is the port number)
window displays, as shown in Figure 3–16.
e. Click OK to enable channel wrapping for the port.