Datasheet

Installing 2T16S Network Processor Modules in the Cisco 4000 Series

78-3277-03

High-Speed Serial Ports

The two high-speed synchronous serial ports use two 60-pin D-type connectors to attach to the transition

cable. Each port requires a serial adapter cable, which provides the interface between the high-speed

serial port and the standard connectors that are commonly used for each electrical interface type. The

adapter cable determines the electrical interface type and mode (DTE or DCE) of the port to which it is

connected. Because the high-speed serial ports use a special, high-density port connector that requires

special adapter cables for each electrical interface type, we recommend that you obtain serial interface

cables from the factory.

The high-speed serial port specifications are as follows:

• Supports speeds up to 2.048 Mbps synchronous, full duplex

• NRZ, NRZI encoding/decoding

• DCE/DTE mode

• CRC-CCITT (16-bit) supported, no CRC-32

• Full/half duplex

• Supports EIA/TIA-232, V.35, X.21, EIA/TIA-449, and EIA-530A interfaces

• 60-pin Cisco standard connector; configuration determined by transition cable type

For most interface types, the adapter cable for DTE mode uses a plug at the network end, and the cable

for DCE mode uses a receptacle at the network end. The exception is the V.35 adapter cable, which is

available with either a V.35 plug or a receptacle for either mode. The mode, DCE or DTE, is labeled on

the molded plastic connector shell at the ends of all cables except V.35 (which uses the standard

Winchester block-type connector instead of a molded plastic D-shell). Following are the available

interface cable options for the mode and network-end connectors for each cable:

• EIA/TIA-232: DTE mode with a DB-25 plug; DCE mode with a DB-25 receptacle

• V.35: DTE mode or DCE mode with a 34-pin Winchester-type V.35 plug; DTE mode or DCE mode

with a 34-pin Winchester-type V.35 receptacle

• X.21: DTE mode with a DB-15 plug; DCE mode with a DB-15 receptacle

• EIA-TIA-449: DTE mode with a 37-pin D-shell plug; DCE mode with a 37-pin D-shell receptacle

• EIA-530A: DTE mode with a DB-25 plug

Caution For proper router operation, both ends of the EIA/TIA-232 serial DCE cable, and any cable attached to

it, must be connected. If you must detach this cable, detach the router end first. If the end away from the

router is disconnected, the line connection will “flap.” The interrupts generated from such a condition

could cause the router to shut down.

Low-Speed Serial Ports

The 16 low-speed serial ports use two 200-pin D-type connectors to attach to the transition cable. Each

200-pin connector requires a transition cable to break out the 8 low-speed serial ports interfaced by the

connector. Together, each 200-pin connector and the 8 associated low-speed serial port cables are called

an “octopus” cable (see Figure 18 through Figure 20 for illustrations of the cable). Each 200-pin port is

independent of the other 200-pin port.