Cisco 2524 - Router - EN Vorbereiten der Installation - Seite 13
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Table 2-4
Specification
Resistance (at 96 kHz)
Capacitance (at 1 kHz)
Impedance (96 kHz)
Wire diameter
Distance limitation
1. nF = nanoFarad.
Synchronous Serial Connections
The serial port on the five-in-one synchronous serial WAN module is a 60-pin, D-type
connector. The synchronous serial port (except the EIA-530) can be configured as DTE or
DCE, depending on the attached cable. All DTE serial ports require external clocking from
a DSU/CSU or other DCE device.
You must use a special serial cable to connect the router to a modem or DSU/CSU. 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 "Cabling Specifications for the
Cisco 2524 and Cisco 2525 Routers" for cable pinouts. For ordering information, contact a
customer service representative.
Note
manufacture your own serial cables is not recommended.
As with all signaling systems, EIA/TIA-232 signals can travel a limited distance at any
given bit rate; generally, the slower the data rate, the greater the distance. Table 2-5 shows
the standard relationship between baud rate and maximum distance.
ISDN BRI Cable Specifications
High-Capacitance Cable
160 ohms/km
120 nF
75 ohms
0.024" (0.6 mm)
32.8' (10 m)
Because of the small size of the pins on the DB-60 serial connector, attempting to
Preparing to Install the Cisco 2524 and Cisco 2525 Routers 2-13
Preparing to Connect to a Network
1
/km
Low-Capacitance Cable
160 ohms/km
30 nF/km
150 ohms
0.024" (0.6 mm)
32.8' (10 m)