Central Site Remote Access Switch 95
H
ARDWARE
I
NSTALLATION
Connecting Adapter Inter-Board Cables
If you have PRI-23/30 cards: Use an MVIP bus connection between cards whenever possible to
achieve the best results. This applies to both:
•
multiple PRI-23/30 configurations
•
PRI-23/30 cards in combination with DM cards
If you have only PRI-23 cards: Use a TDM bus between WAN cards and an MVIP bus to connect to
the DM. (I.e., connect all TDM connectors to other TDM connectors, and all MVIP connectors to
other MVIP connectors within the system.)
If you have a mixture of PRI-23 cards and PRI-23/30 cards: Use both a TDM bus and an MVIP bus.
Connect all TDM connectors to other TDM connectors, and all MVIP connectors to other MVIP
connectors within the system.
If you have BRI, PRI-8 or Expander cards: You must use a TDM bus. If you also have a DM card in
your configuration but no PRI-23 or PRI-23/30, you will need to use a
crossover cable
to connect the
TDM bus to the MVIP connector of the DM card.
To establish the inter-board bus, you’ll need a flat bus cable and possibly a crossover cable.
The flat bus cable is a 40-pin ribbon cable. The cable can have from 2 to 6 connectors, depending on
the adapter configuration of the CyberSWITCH. The ribbon cable connectors are spaced
approximately 1 inch apart to mate with the adapter connectors. Never cut a flat cable to shorten it.
Flat Bus (Ribbon) Cable
Some flat cables consist of a primarily grey ribbon, with a single red wire to indicate pin 1. These
are essentially the same as the flat bus cable pictured.
Interconnect all the adapters with the same connectors using one flat bus cable of an appropriate
length. If your installation combines cards that have TDM-only connectors with cards that have
MVIP-only connectors, you will need to use a crossover cable.
The crossover cable is a 12-wire ribbon cable with 40-pin connectors. You only need the crossover
cable if all the following conditions are true:
•
a Digital Modem adapter is present,
•
BRI-4, or PRI-8 is present, and
•
no PRI-23 or PRI-23/30 is present
Notice that the crossover cable connects between two flat cables. When connecting the crossover
cable to the flat cable, align pin 1 on both connectors. Pin 1 is identified by an embossed triangle on
the underside of each connector.
40-wire
ribbon cable
pin 1
4 adapter bus
connectors
2 adapter bus
connectors
40-wire
ribbon cable
