Black Box 5000 manual Using CSU/DSUs with the Interconnect Link

Multiserver 5000

7.2 Using CSU/DSUs with the Interconnect Link

Figure 7-2illustrates a Multiserver network, with a Multiserver 5000 as the central hub and three other Multiservers attached to the local hub. Each interconnect link is set up differently.

The CSU/DSU MS (MT132A-R2) is used in these examples as the external CSU/DSU. This CSU/DSU can be configured for RS-232 operation, saving you the expense of the V.35 Converter (MX226). If you have different model CSU/DSUs in your network, you will need to make changes to these instructions as appropriate.

The DDS line normally provides clocking for the interconnect link. During Bench Configuration, the Local Multiserver’s CSU/DSUs will provide clocking for all of the interconnect links.

During the Bench Configuration, you will need an RJ-48 to RJ-48 crossover cable (EL08M) for each interconnect link.

For more information on the MS1 56K CSU/DSU module, see the MS1 56K CSU/DSU Module User’s Manual. For information on configuring ports for an interconnect link and setting clocking for the interconnect link, refer to Section 8.4, Port Configuration, and Section 8.5, The Interconnect Link.

INTERNAL CSU/DSU TO INTERNAL CSU/DSU

Interconnect link A (see Figure 7-2) runs from an MS1 56K CSU/DSU module on the Local Multiserver to an MS1 56K CSU/DSU module on the Remote_1 Multiserver.

Set Jumper E2 on the Local CSU/DSU module for internal clocking. Make sure that port A1 on the Local Multiserver is configured for an interconnect link with external clocking. The CSU/DSU module will provide the clocking.

The Remote_1 Multiserver CSU/DSU module’s jumper should be set to external clocking (default setting). Port A1 should be configured as an inter- connect link with external clocking (default setting).

EXTERNAL CSU/DSU TO INTERNAL CSU/DSU

Interconnect link B (see Figure 7-2) runs from an external CSU/DSU (MT132A-R2) on the Local

Multiserver to an MS1 56K CSU/DSU module on the Remote_2 Multiserver.

Connect the CSU/DSU MS to the Local Multiserver with male-to-male crossover cable (EZ423). The CSU/DSU MS should be configured for RS-232 operation with internal clocking at 56 Kbps (this matches the DDS network). Make sure port A2 on the Local Multiserver is configured for an interconnect link with external clocking.

The Remote_2 Multiserver CSU/DSU module’s jumper should be set to external clocking (default setting). Port A1 should be configured as an inter- connect link with external clocking (default setting).

EXTERNAL CSU/DSU TO EXTERNAL CSU/DSU

Interconnect link C (see Figure 7-2) runs from an external CSU/DSU (MT132A-R2) on the Local Multiserver to an external CSU/DSU on the Remote_3 Multiserver.

Connect the CSU/DSU MS to the Local Multiserver with male-to-male crossover cable (EZ423). The CSU/DSU MS should be configured for RS-232 operation with an internal clock. Make sure port A3 on the Local Multiserver is configured for an interconnect link with external clocking.

Attach the CSU/DSU MS to the Remote_3 Multiserver with male-to-male crossover cable (EZ423). The CSU/DSU MS should be configured for RS-232 operation, connection to a DDS network, and external clocking. Port A1 should be configured as an interconnect link with external clocking (default setting).

CCM INDICATORS

Connect the cables and plug in the Multiservers. The CCM indicator LEDs for each link should be off. This indicates that the link is functioning properly. A flashing LED indicates a problem with your equipment or configuration.

FINAL INSTALLATION

After the Bench Configuration, you will need to reconfigure all of your local CSU/DSUs for DDS clocking. The remote CSU/DSUs will not need any reconfiguration.

62