1-2
PA-2CE1 Channelized E1 Port Adapter Installation and Configuration
OL-3519-01
Chapter
LEDs
Figure 1-2
PA-2CE1—Faceplate View—PA-2CE1/PRI-120 Shown
When running channelized E1, each 2CE1 interface provides up to 31 E1 channel groups, which are
numbered from 0 to 30. Each channel group provides up to 31, 64 kilobit-per-second (kbps) timeslots
(DS0 channels), which are numbered 1 to 31. Multiple DS0 channels can be mapped to a single channel
group. Each channel group is presented to the system as a serial interface that can be configured
individually. Usable bandwidth for each channel group is calculated as n x 64 kbps, where n is a number
of DS0 channels (1 to 31).
When running ISDN PRI, each 2CE1 interface provides 30 bearer (B) channels that can transmit and
receive data at the rate of 64 kbps, full duplex, and one data (D) channel that can transmit and receive
data at the rate of 16 kbps, full duplex. The B channels are used for transmitting user data. The D channel
is used for call setup control and network connection teardown, and provides the communication from
the router to the ISDN switch. The B and D channels are presented to the system as serial interfaces that
support High-Level Data Link Control (HDLC) and Point-to-Point protocol (PPP) encapsulation. The
PA-2CE1 support dial-on-demand routing (DDR) when running ISDN PRI.
LEDs
The PA-2CE1 has an enabled LED, standard on all port adapters, and six status LEDs, three for each
port. (See Figure 1-3.)
Figure 1-3
LEDs on the PA-2CE1—Horizontal Orientation
After system initialization, the enabled LED goes on to indicate that the port adapter has been enabled
for operation.
The following conditions must be met before the
PA-2CE1 is enabled:
•
The PA-2CE1 is correctly connected and is receiving power.
•
A valid system software image for the port adapter has been downloaded successfully.
•
The system recognizes the PA-2CE1 or PA-2CE1-equipped VIP2.
If any of the above conditions are not met, or if the initialization fails for other reasons, the enabled LED
does not go on.
H9574
CHANNELIZED E1/PRI-120 OHM
EN
LB
LA
RA
0
1
LB
LA
RA
H8657
CHANNELIZED E1/PRI-75 OHM
EN
LB
LA
RA
0
1
LB
LA
RA
