Dtc And Standard Cables; Combining Different Signal Types In The Same Cable Bundle; And 10Baset; And Rs-423 And Telephone Cables - HP A4500A - VMEbus Single Board Computer 744 Motherboard Manual

DTC and standard cables

The DTC 72MX and DTC 16xx family provide RS-232-D or RS-423 ports with
RJ45, DB25 or Telco 50-pin connectors. The DTC units support the distances
provided by the RS-232/RS-423 standards, given in the table below. Additionally,
HP has tested, in favourable environmental conditions, the distances given in the
final column of the table below. Depending upon your environment, the maximum
usable distance will fall between these two figures.
Shielded cables
You can use shielded cables to connect the 8-port MDP, or 8-port DDP, to a DTC
unit via the 62-pin DTC connector or the Telco 50-pin connector.
Note You cannot use shielded cables to connect the 24-port RJ45 DDP, the 16-port RJ45
DDP, or the 8-port RJ45 breakout panel, to a DTC unit.

Combining different signal types in the same cable bundle

RS-232 and 10BaseT
10BaseT and RS-232 signals can run on twisted pairs enclosed in the same cable
bundle without interference to either signal type. Combining 10BaseT and RS-232
signals is supported at the specified maximum distance of RS-232.
RS-232 and RS-423 and telephone cables
RS-232 and RS-423 cannot share the same cable bundle with telephone cables.
RS-423 and 10BaseT
10BaseT and RS-423 signals can run on twisted pairs enclosed in the same cable
bundle without interference to either signal type. Combing 10BaseT and RS-423
signals is supported at the lowest value of the specified maximum distance of
RS-423 or 10BaseT.
Conductors
RS-232 3 to 5
RS-423 4 to 6
Maximum distance
defined by standard
15m or 50ft
200m or 650ft
DTC and standard cables
Maximum
tested distance
70m or 230ft
200m or 650ft
8
75