Cisco CPA2501, Руководство пользователя

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2-14 Cisco 2500 Series Multiport Serial Router User Guide
Network Connection Considerations
You must use a special serial cable to connect a multiport serial router to a modem or
CSU/DSU. This cable is available from Cisco and is usually ordered with the system. The
cable uses a DB-60 connector on the chassis end. See the appendix “Cisco Multiport Router
Cable Specifications” for cable pinouts. For ordering information, contact a customer
service representative.
BRI Connections
On models with a Basic Rate Interface (BRI) port, the BRI port is an RJ-45 8-pin connector
located between the UTP and console ports on the Cisco 2520 and Cisco 2521, or between
the 10BT and console ports on the Cisco 2522 and Cisco 2523. Use an appropriate cable to
connect the system directly to the Integrated Services Digital Network (ISDN) through the
NT1. The common carrier will provide the NT1 connection worldwide, except in North
America, where the NT1 is customer owned.
Warning
Network hazardous voltages are accessible in the BRI cable. If you detach the
BRI cable, detach the end away from the multiport serial router first to avoid possible
electric shock. Network hazardous voltages also are accessible on the system card in the
area of the BRI port (RJ-45 connector), regardless of whether power is turned off. (To see
translated versions of this warning, refer to the appendix “Translated Safety Warnings.”)
Warning
The ISDN connection is regarded as a source of voltage that should be
inaccessible to user contact. Do not attempt to tamper with or open any public telephone
operator (PTO)-provided equipment or connection hardware. Any hardwired connection
(other than by nonremovable, connect-one-time-only lug) must be made only by PTO staff
or suitably trained engineers. (To see translated versions of this warning, refer to the
appendix “Translated Safety Warnings.”)