ADC 150-2450-55, Техническая практика

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Appendix A - Specifications LTPH-TP-1047-01, Issue 1
36 March 12, 2001 H2TU-R-402 List 5E
C
RAFT
P
ORT
Figure 26 shows the pinout for the craft port connector and its connection to a DB-9 or DB-25 connector on a
maintenance terminal.
Figure 26. RS-232 Craft Port Pinouts
Local and Line Power
The H2TU-R-402 can be line-powered from the H2TU-C over the HDSL2 span, or it can be powered by 48 V
local power supply applied to pins 35 and 17 as shown in
Figure 19 on page 22 .
When the local power is applied to this unit, it automatically provides a resistive termination at its HDSL2 port.
This termination will sink 10 mA of sealing current when connected to a compatible line unit.
Table 16 lists the
effect that various combinations of plugs have on sealing current operation.
Table 16. Sealing Current vs. Plug Types
H2TU-C H2TU-R Sealing Current Operation
List 3E
(a)
List 5E C sources R terminates
List 3E
(a)
List 4E C terminates R sources
List 1E
(b)
, 2E List 4E C terminates R sources
List 1E
(b)
, 2E List 5E C terminates R terminates; no sealing current flows
(a) Including the H2TU-C-319, List 1E
(b) Except for the H2TU-C-319, List 1E
H2TU-R-402
DB-9 Connector
(DCE)
RD (Receive Data)
TD (Transmit Data)
3
2
5
DB-9 Connector
(DTE)
DB-25 Connector
(DTE)
2
3
5
3
2
7
GND
Terminal
Terminal