Leds - Cisco PA-4T+ Installation And Configuration Manual

LEDs

Table 1-1
Rate (bps)
2400
4800
9600
19200
38400
56000
1544000 (T1)
Balanced drivers allow EIA/TIA-449 signals to travel greater distances than EIA/TIA-232. The
recommended distance limits for EIA/TIA-449 shown in Table 1-1 are also valid for V.35, X.21, and
EIA-530. EIA/TIA-449 and EIA-530 support 2.048-Mbps rates, and V.35 supports 2.048-Mbps rates
without any problems; we do not recommend exceeding published specifications for transmission speed
versus distance. Do so at your own risk.
LEDs
The PA-4T+ contains the ENABLED LED, standard on all port adapters, and one status LED for each
port. After system initialization, the ENABLED LED goes on to indicate that the PA-4T+ has been
enabled for operation. (The LEDs are shown in
Figure 1-3
The following conditions must be met before the PA-4T+ is enabled:
•
•
•
If any of the above conditions are not met, or if the initialization fails for other reasons, the ENABLED
LED will not go on.
PA-4T+ Synchronous Serial Port Adapter Installation and Configuration
1-4
Standards for Transmission Speed Versus Distance
EIA/TIA-232
Distances
Feet Meters
200 60
100 30
50 15
25 7.6
12 3.7
8.6 2.6
– –
PA-4T+ LEDs
The port adapter is correctly connected to the backplane midplane and receiving power.
A valid system software image for the port adapter has been downloaded successfully.
The system software recognizes the port adapter or VIP with an installed PA-4T+.
EIA/TIA-449, X.21, V.35, EIA-530
Distances
Feet Meters
4,100 1,250
2,050 625
1,025 312
513 156
256 78
102 31
50 15
Figure 1-3.)
Chapter 1 Overview
OL-3561-04