Black Box 5000 - Manual (Page 64)

Multiserver 5000
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7.2 Using CSU/DSUs with the Interconnect Link
Figure 7-2 illustrates 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 .
I NTERNAL CSU/DSU TO I NTERNAL 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).
E XTERNAL CSU/DSU TO I NTERNAL 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).
E XTERNAL CSU/DSU TO E XTERNAL 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 I NDICATORS
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.
F INAL I NSTALLATION
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.