Black Box SM720C User manual

SEPTEMBER 2000
SM720C
SM721C
SM722C
SM723C
SM724C
Rear Interface Switch Cards
CUSTOMER SUPPORT INFORMATION
Order toll-free in the U.S.: Call 877-877-BBOX (outside U.S. call 724-746-5500)
FREE technical support 24 hours a day, 7 days a week: Call 724-746-5500 or fax [phone]
Mailing address: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018
Web site: www.blackbox.com • E-mail: [email protected]

2
REAR INTERFACE SWITCH CARDS
Specifications
Connectors — SM720C: (3) DB25 female; SM721C:
(3) M/34 female; SM722C: (3) DB15 female; SM723C:
(3) RJ-11; SM724C: (3) RJ-45
Leads Supported — SM720C: 25; SM721C: 34; SM722C:
15; SM723C: 6; SM724C: 8
Power — From the rack chassis
Size — 1⁄4-size card
Weight — 1 lb. (0.5 kg)

3
REAR INTERFACE SWITCH CARDS
Description
Rear cards work with front cards to manage lines. The
front card contains the switching and patching circuitry;
the rear card contains the cable interface circuitry. The
front card and the rear card mate when they are
inserted into a rack (see the illustration below).
Rear cards and front cards that mate must be
compatible.
In a rack, there are 16 slots for front cards, and 16
corresponding slots for rear cards. The cards occupy
one slot.
Rear cards have ports that correspond to their
applications. They also have a slot number window that
Front card Rear card

4
REAR INTERFACE SWITCH CARDS
indicates the number of the slot in which the card is
installed.
Rear cards available include:
Model Application # of Slots Connectors
SM720C A/B switch (and patch) 1 A, B, Common: DB25F
SM721C A/B switch (and patch) 1 A, B, Common: V.35F
SM722C A/B switch (and patch) 1 A, B, Common: DB15F
SM723C A/B switch 1 A, B, Common: RJ-11
SM724C A/B switch 1 A, B, Common: RJ-45
Each card comes with 2 screws and this users’ manual.

5
REAR INTERFACE SWITCH CARDS
Installation
To Install a Rear Card:
1. First, you’ll need to insert the corresponding front
card and tighten the screws. You don’t need to fill all
slots in a rack or fill slots in any particular order.
2. Insert the rear card and tighten the screws.
To Replace a Rear Card:
1. Unscrew the mounting screws.
2. Slide the card out of the rack and install a
replacement.
CAUTION
Electrostatic Discharge (ESD): Cards are ESD-sensitive. To
prevent ESD damage, always wear grounding wrist straps
when touching, removing, or inserting cards. Store and
transport cards in sealed static-shielding containers.

1000 Park Drive • Lawrence, PA 15055-1018 • 724-746-5500 • Fax [phone]
© Copyright 2002. Black Box Corporation. All rights reserved.