Cisco 4000 Manual page 2

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Dual-port high-speed synchronous serial and 16-port low-speed
synchronous/asynchronous serial. The high-speed ports supports EIA/TIA-232,
EIA/TIA-449, V.35, X.21, NRZ/NRZI, DTE/DCE, or EIA-530 DTE interfaces. The
low-speed ports support EIA/TIA-232, V.35, or X.21 interfaces in DTE or DCE mode.
Each low-speed port can be individually configured for synchronous or asynchronous.
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Single-port HSSI
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Single-port and dual-port Token Ring
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Dual attachment single-mode FDDI
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Single attachment or dual attachment multimode FDDI
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Four-port or eight-port ISDN BRI
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Four-port balanced or unbalanced G.703/G.704
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Single-port channelized T1/ISDN PRI
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Single-port balanced or unbalanced channelized E1/ISDN PRI
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Single-port ATM with single-mode OC-3 and long-reach capability, multimode OC-3,
DS-3, or E3 interfaces
Note
configuration note packet shipped with your router.
Note
and RS-449 before their acceptance as standards by the Electronics Industries Association
(EIA) and Telecommunications Industry Association (TIA)
Figure 1-1 shows the front panel of a Cisco 4000 series router.
Figure 1-1
1-2 Cisco 4000 Series Installation Guide
For information about modules released after publication of this guide, see the
EIA/TIA-232 and EIA-TIA-449 were known as recommended standards RS-232
Cisco 4000 Series Chassis—Front Panel