Black Box RS-232 manual Power, Management Control Card, Front Interface Cards, continued from page

The front and back views of a Pro Switching System II chassis.

All modules mount in a Pro Switching System II chassis for installation in a standard 19-inch rack. The chassis includes a six-foot (1.8-m) AC power cord. Standard AC voltage is 115- or 230-volt input.

The redundant front-loaded power supplies (to be ordered separately) provide DC-voltage power to the chassis.

The Management Control Card (also to be ordered separately) contains LEDs that indicate signal status of any interface patched to the control- module cavity from a patch cavity. The LEDs illuminate with a positive voltage, such as a data “space” or a control signal “high.” Next to each LED are voltage-test jacks.

(2) Power	(1) Management Control Card		(16) Front Interface Cards
Supplies (Slot is also used for Terminal Display Card)		(Slots are also used for Universal Serial Cards)

Attaching ears are slotted at the standard EIA location for a 7" panel.

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module communications and test functions.

You can use the interface labeled ”I/A”, for instance, to connect a basic error rate (BER) tester or a protocol analyzer. In addition to BER tests, you can conduct protocol simulation, block error rate (BLER) tests, or error-free seconds (EFS) tests.

The other test interface, labeled “Monitor,“ enables you to connect a data-line monitor device when you want to passively monitor certain lines. The interface’s parallel-wired connectors are also used to daisychain two or more PSSII chassis.

Modules for the system

For your various interface

requirements, we offer a number of modular cards (also called circuit cards) that can be installed in a PSSII chassis. Each card is a single switchable circuit between your data terminal equipment (DTE) and data communications equipment (DCE), and feature circuit-status display and alarm definition, detection, and reaction.

The cards are equipped with three ports that link to A, B, and

Common paths. These paths connect to the equipment cables attached in at the chassis’ rear. You can switch paths, for instance, when you need to reroute a circuit from an attached device that has failed to a device or circuit that’s operational. To switch, press a button on the mounted card. LEDs inform you of your selected switch position.

Each card has four manual patch cavities. Three of these provide intrusive access to the A, B, and Common (modem) sides of the switchable circuit. The fourth cavity provides bridged (non- intrusive) access to the Common (modem) side.

RS-232, RS-530, X.21, and V.35 Front Interface Cards, (SM906C–SM909C) feature a switchable A/B circuit, a common RS-232 or V.35 cable connection, plus signal-monitoring LEDs. You can mix, match, and install up to 16 cards in the chassis.

With up to nine alarm options, each RS-232, RS-530, and V.35 circuit can be individually configured for up to a maximum of eight alarms on the presence or absence of Physical Layer signals. And each X.21 circuit can be individually configured for up

to six programmable alarms.

If you don’t require patching capabilities but want economical A/B switching plus transfer speeds of 10 Mbps! within your PSSII, order Universal Serial Cards (SM930C–SM934C). These cards support RS-232, V.35, RS-530, X.21, 10BASE-T, and analog RJ-11 or RJ-45 communications. They differ only in the interface adapters shipped with them (except for the SM930C, which is designed to link to the chassis’ three DB25 connectors and, therefore, requires no adapters).

The SM930C is a universal DB25 model that’s suitable for RS-232 or RS-530 switching applications.

The SM931C has three DB25 male to DB9 female adapters. It’s ideal for RS-232 TIA-574 (IBM® PC COM port) switching applications.

The SM932C has three DB25 male to DB15 female adapters and is suitable for X.21 switching.

The SM933C has three DB25 male to RJ-11 female adapters and is suitable for 4-wire RS-422 applications or can be used to switched telephone circuits not connected to the public telephone system.

The SM934C, which features RJ-45 connectors that are RJ-48 compatible and are unkeyed,

includes three DB25 male to RJ-45 female adapters. It’s suitable for RS-232 TIA-561, 8-wire RS-422, 10BASE-T, or Token Ring (up to

16 Mbps) applications. It can also be used to switch private T1 or E1 circuits not connected to the public telephone system.

With its latching relay feature, the Universal Serial Card forwards all traffic in the event of a power failure and, when used as a copper path, operates independent of speed and protocol. And there’s no complicated programming!

As with the Front Interface Cards, the Universal Serial Cards install in the front of the PSSII chassis and can even be mounted alongside the Front Interface Cards.

In a daisychain configuration, you can put up to 16 Front Interface or Universal Serial Cards in each slave chassis. The master chassis can be populated with up to 16 of these cards plus one Terminal Display Card.

Management cards

For managing the chassis, you’ll need either a Management Control Card or a Terminal Display Card.

The Management Control Card (SM902C or SM904C) provides

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