CHAPTER 5: Operation
17
5.3 LCD Displays
The LCD (liquid crystal display) on the bridge’s front panel displays various types of information.
When the bridge is first powered on, it initializes itself, and various system status messages are displayed. If
the bridge passes all self-tests and comes up successfully, a message identifying the bridge will be displayed.
An example is given below.
BRIDGE 002-9-003
This message indicates that bridge 9 is connecting rings 002 and 003. The first number (002 in this case) is
the virtual ring number assigned to the Ethernet. The last number (003) is the token-ring number.
If you press the Status switch UP repeatedly when the LCD shows the above message, several other messages
will appear. These are described below:
E-NET TEST OK
Indicates that the status of Ring A, the Ethernet, is OK.
E-NET FAILED
Indicates that the Ethernet diagnostic routine failed during power-up. If this message appears, check the
cable attaching the bridge to the Ethernet MAU.
T-RING
status nnn
In the place of
status
will be either
OPEN
,
CLOSED
, or
INIT
.
INIT
indicates that the token ring is
initializing. After
OPEN
or
CLOSED
, in the place of
nnn
will be one of the entries in the chart below.
Display
Meaning
h04
4 Mbps, hardware-selected
h16
16 Mbps, hardware-selected
s04
4 Mbps, software-selected
s16
16 Mbps, software-selected
MODE
type
In the place of
type
will be either
STARTUP
or
BRIDGE
for the current operating mode of the bridge.
Operating modes are covered earlier in this chapter.
FRAMES
nnnn
/SEC
nnnn
will be replaced by the number of frames bridged per second. The number will dynamically change as
the number of frames rises and falls. This display operates only when the bridge unit is in bridge mode and
both ports of the bridge have successfully inserted on their respective rings.
MAC
nnnnnnnnnnnn
The 12-digit IEEE MAC-level address of Ring B, in token-ring format. The MAC addresses for the two rings
are consecutive. (The address for the Ethernet is this number plus one.) This MAC address can be
overridden using the Bridge Manager, but the original IEEE address will always be displayed on the LCD.
