Eia/Tia-449 Interface; Eia/Tia-449 Connections; Eia/Tia-449 Serial Cable Assembly - Cisco MWR 1941-DC - 1941 Mobile Wireless Router Hardware Installation Manual

Serial Connection Signals and Pinouts
Table B-9
60-Pin
J1-45
Shield
J1-44
Shield
J1-39
Shield
J1-40
Shield
J1-33
Shield
J1-34
Shield
J1-38
Shield

EIA/TIA-449 Interface

This section contains the following topics:
•
•

EIA/TIA-449 Connections

EIA/TIA-449, which supports balanced (EIA/TIA-422) and unbalanced (EIA/TIA-423) transmissions,
is a faster (up to 2 Mbps) version of EIA/TIA-232 that provides more functions and supports
transmissions over greater distances.
The EIA/TIA-449 standard was intended to replace the EIA/TIA-232 standard, but it was not widely
adopted primarily because of the large installed base of DB-25 hardware and because of the larger size
of the 37-pin EIA/TIA-449 connectors, which limited the number of connections possible (fewer than
possible with the smaller, 25-pin EIA/TIA-232 connector).
Cisco MWR 1941-DC Mobile Wireless Edge Router Hardware Installation Guide
B-14
EIA/TIA-232 DCE Cable Pinout (DB-60 to DB-25) (continued)
Signal Note
Circuit Twisted pair no. 1
GND
–
LL/DCD Twisted pair no. 2
–
TXCE/TX Twisted pair no. 7
C
–
NIL/RXC Twisted pair no. 6
–
DCD/LL Twisted pair no. 12
–
DSR/DTR Twisted pair no. 11
–
RXC/TXC Twisted pair no. 8
E
–
EIA/TIA-449 Connections

EIA/TIA-449 Serial Cable Assembly

Appendix B
Direction 25-Pin Signal
– J2-7 Circuit
– Shield GND
—> J2-8 DCD
– Shield –
—> J2-15 TXC
– Shield –
—> J2-17 RXC
– Shield –
<— J2-18 LTST
– Shield –
<— J2-20 DTR
– Shield –
<— J2-24 TXCE
– Shield –
Cable Specifications
78-15827-06B0