Chapter 6 Using the Cables
This chapter describes the use of various cables and converters when applying routers.
Physical Cable Connection
Connecting an Asynchronous Interface
Connecting an Asynchronous Interface Module to a Modem
As a DCE device, the modem has two types of serial interfaces: DB9F and DB25F female sockets.
Connecting the Asynchronous Card to the Modem
The asynchronous cable with 1-to-8 crystal connectors converts the 68-pin connector of the asynchronous interface into
eight RJ-45 connectors, and then connects to the DB25F interface of the modem through the RJ-45 (crystal jack)-DB25
male converter.
When the asynchronous cable with 1-to-8 crystal jacks is used, you need to use a straight through cable to connect the
converter cable of the asynchronous interface module to the converter.
This mode applies to SIC-8A.
Table : Connecting the asynchronous interface module to the Modem.
Device
Cable 1
Cable 2
Cable 3
Peer
SIC-8A
Asynchronous
cable with 1-to-8
crystal connectors
RJ-45 (crystal
jack)-DB25 male
converter
N/A
DB25F interface of the
Modem
Asynchronous
cable with 1-to-8
crystal jacks
Straight-through
cable
RJ-45 (crystal
jack)-DB25 male
converter
Connect the AUX Port to the Modem
The AUX port is connected to the Modem through a rollover cable with RJ-45 (crystal jack)-DB25 male converter or an
RJ45-DB9 male converter.
The AUX port connected through an RJ-45 rollover cable is the same as the asynchronous card connected
through the asynchronous cable with 1-to-8 crystal connectors, and also similar in the connection to the
Modem.
Table: Connecting the AUX port module to Modem