4-Port Serial Network Module
Cisco Network Modules Hardware Installation Guide
6-10
4-Port Serial Network Module
This section provides information about the 4-port serial network module (Cisco product
number NM-4T) for Cisco modular routers. With the appropriate serial transition cable,
each port on this module can provide a EIA/TIA-232, EIA/TIA-449, V.35, X.21,
DTE/DCE, EIA-530 DTE, or nonreturn to zero/nonreturn to zero inverted (NRZ/NRZI)
serial interface, in any combination. The module provides a synchronous data rate of 8
MB/sec on port 0, 4 MB/sec each on port 0 and port 2, or 2 MB on all four ports
simultaneously. (See Figure 6-4.)
Figure 6-4 4-Port Serial Network Module
Connecting the 4-Port Serial Module to a Network
The 4-port serial network module provides four universal high-density 60-pin receptacles.
The serial cable attached to each receptacle determines the port’s electrical interface type
and mode, data terminal equipment (DTE) or data communications equipment (DCE).
Types of Serial Cables
Cisco Systems offers five types of serial cables (also called serial adapter cables or
transition cables):
• EIA/TIA-232 Serial Cable Assembly
• EIA/TIA-449 Serial Cable Assembly
CN/LP RXC
SERIAL 3 SERIAL 2 SERIAL 1 SERIAL 0
RXD TXC TXD CN/LP RXC RXD TXC TXD CN/LP RXC RXD TXC TXD CN/LP RXC RXD TXC TXD
EN
Serial ports (DB-60)
H9597
SERIAL
4T
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