Administering MAX Hardware
Troubleshooting the No Logical Link status
MAX Administration Guide
1-9
10BaseT port and the Ethernet hub. Figure 1-6 shows the back panel of the MAX 800 unit,
including the link status light.
Figure 1-6. MAX 800 back panel
If you need more information about any component, read the description in Table 1-6.
Note:
Figure 1-6 shows two PCMCIA card modems inserted in Slots 7 and 8. An ISDN
terminal adapter requires two slots.
Troubleshooting the No Logical Link status
In some countries outside the U.S., it is common for no logical link to exist before the MAX
unit places a call. In the U.S., when you first plug a line into the unit or switch power on, the
central office switch can take as long as 15 minutes to recognize that the line is now available.
You might have to wait that long for the line state to change to Active (A). The physical link
can exist without a logical link up on the line.
If you wait longer than 15 minutes and the line is still not available:
1
Determine whether all the telephone cables are wired straight through.
If you are running multipoint (passive bus) on your switch, all of the telephone cables
must be wired straight through. If any of the cables are wired to cross over, you will not be
able to place calls.
2
Verify that 100% termination is provided on each line.
3
Determine whether you have correctly specified the Service Profile Identifiers (SPIDs) in
the Line N profile for each line. If the SPIDs are not correctly specified, the line status
might indicate No Logical Link. Check with your system manager or carrier
representative to obtain the SPID or SPIDs for your line. To specify your SPIDs, use the
Pri SPID and Sec SPID parameters in the Line N profile.
Troubleshooting the AIM port interface
You can connect a videoconferencing codec (coder/decoder) to a port supporting inverse
multiplexing to communicate over a point-to-point link. The MAX supports two types of
Inverse Multiplexing: Bandwidth ON Demand Interoperability Group (BONDING) and
Ascend Inverse Multiplexing (AIM). Both types are supported by the V.35, RS-449, or X.21
port on the MAX unit. Typically, inverse-multiplexed calls are between video codecs and other
devices that might need high bandwidth for serial data over the WAN.