Specifications

84 AR Router
C613-03058-00 REV A
Figure44: Pin wiring diagram for an ISDN Primary Rate Interface (75Ω) cable.
Terminal and Modem Cables
Table 35 on page 84 lists the wiring diagrams to follow when constructing
terminal and modem cables for various connector and port combinations.
The RING input is only available on asynchronous ports on expansion cards. It is not
available on asynchronous ports on base CPU boards.
An alternative method, for both terminal and modem cables, is to wire an R-45
patch cord (a straight pin-to-pin cable with RJ-45 connectors on both ends) and
then use an RJ-45-to-DB25 adaptor wired internally as a crossed cable. These
adaptors are available in both DB25 female and male versions from data
cabling suppliers, and are supplied with wires terminated on the RJ-45 socket
and pins on the free ends. The pins are inserted into the appropriate positions
in the DB25 shell.
BNC
(to router)
BNC
(to NT)
TX
→
Cable Shield
Notes:
(1) → Output from router; ← Input to router.
(2) Use 75 ohm coaxial cable.
(3) Cable version 1.0.
RX
RX
←
Cable Shield
TX
PRI75NT
Table 35: Terminal and modem cables.
Cable Figure
RJ-45 (router) to DB25 female (terminal) cable Figure 45 on page 85
DB9 female (router/DTE) to DB9 female (PC/terminal/DTE) cable Figure 46 on page 85
DB9 male (router/DCE) to DB9 female (PC/terminal/DTE) cable Figure 47 on page 86
DB9 female (router/DTE) to DB9 male (modem/DCE) cable Figure 48 on page 87
DB9 male (router/DCE) to DB9 male (modem/DCE) cable Figure 49 on page 87
RJ-45 (router) to DB25 male (modem) cable Figure 50 on page 88
R-J45 (router) to MiniDin (Macintosh) Figure 51 on page 88