Troubleshooting Aids

Certain troubleshooting aids of the Cisco ASR 920 Router enable you to perform these tasks that assist the troubleshooting process:

Verify Pinout

Pinouts provide input signal (to the device) and output signal (from the device) information. Bits (BITS) port, GPS Port (1PPS and 10MHz), USB Console (CONSOLE) port, Time-of-Day (TOD) port, Alarm (ALARM) port, USB (USB CON and USB MEM) port, and Management Ethernet (MGMT) port pinout information is provided in the following sections.

BITS Port Pinouts

The following table summarizes the BITS port pinouts.

Table 1. BITS Port Pinouts

Pin

Signal Name

Direction

Description

1

RX Ring

Input

Receive Ring

2

RX Tip

Input

Receive Tip

3

—

—

Not used

4

TX Ring

Output

TX Ring

5

TX Tip

Output

TX Tip

6

—

—

Not used

7

—

—

Not used

8

—

—

Not used

GPS Port Pinouts

The following table summarizes the GPS port pinouts.


Note
The 10 Mhz and 1 PPS interfaces can be configured as input or output using Cisco IOS CLI commands. For more information, see the Cisco ASR 920 Series Aggregation Services Router Configuration Guide.
Table 2. GPS Port Pinout

10 Mhz (input and output)

1PPS (input and output)

Waveform

Input—Sine wave

Output—Sine or square wave

Input—Pulse shape

Output—Pulse shape

Amplitude

Input— > 1.7 volt p-p (+8 to +10 dBm)

Output— > 2.4 volts TTL compatible

Input— > 2.4 volts TTL compatible

Output— > 2.4 volts TTL compatible

Impedance

50 ohms

50 ohms

Pulse Width

50% duty cycle

26 microseconds

Rise Time

Input—AC coupled

Output—5 nanoseconds

40 nanoseconds

Time-of-Day Port Pinouts

The following table summarizes the ToD/1-PPS port pinouts.

Table 3. RJ-45 1PPS/ToD Port Pinouts

Pin

Signal Name

Direction

Description

1

RESERVED

Output

Do Not Connect

2

RESERVED

Input

Do Not Connect

3

1PPS_N

Output or Input

1PPS RS422 signal

4

GND

—

—

5

GND

—

—

6

1PPS_P

Output or Input

1PPS RS422 signal

7

TOD_N

Output or Input

Time-of-Day character

8

TOD_P

Output or Input

Time-of-Day character

Alarm Port Pinouts

The following table summarizes the external alarm input pinouts.

Table 4. External Alarm Input Pinouts

Pin

Signal Name

Description

1

ALARM0_IN

Alarm input 0

2

ALARM1_IN

Alarm input 1

3

—

No connect

4

ALARM2_IN

Alarm input 2

5

ALARM3_IN

Alarm input 3

6

—

No connect

7

—

No connect

8

COMMON

Alarm common

Management Ethernet Port Pinouts

The following table summarizes the Management Ethernet port pinouts.

Table 5. Fan Alarm Port Pinout

Pin

Signal Name

1

TRP0+

2

TRP0-

3

TRP1+

4

TRP2+

5

TRP2-

6

TRP1-

7

TRP3+

8

TRP3-

USB Console Port Pinouts

The following table summarizes the USB console port pinouts.

Table 6. Single USB Console Port Pinouts

Pin

Signal Name

Description

A1

Vcc

+5VDC

A2

D-

Data -

A3

D+

Data +

A4

Gnd

Ground


Note
The USB console port +5VDC is input, and operates as an USB peripheral device.

USB MEM Port Pinouts

The following table summarizes the USB MEM port pinouts.

Table 7. Single USB MEM Port Pinouts

Pin

Signal Name

Description

A1

Vcc

+5VDC (500mA)

A2

D-

Data -

A3

D+

Data +

A4

Gnd

Ground

Note
USB TYPE-A receptacle is used.

Note
The USB MEM port +5VDC is output. Cisco ASR 920 Router provides power for USB MEM port. This port operates as a USB host device.

Check Optical Fiber Specifications

The specification for optical fiber transmission defines two types of fiber: single mode and multimode. Within the single-mode category, three transmission types are defined: short reach, intermediate reach, and long reach. Within the multimode category, only short reach is available. For information about optical SFP modules, see the documentation for the SFP module at:

http://www.cisco.com/en/US/partner/products/hw/modules/ps5455/prod_installation_guides_list.html .

Check Alarm Conditions

The following table summarizes the meaning of the alarm conditions on the Cisco ASR 920 Router.

Table 8. Alarm Condition Summary

Alarm Type

Alarm Meaning

Critical

Port in down state.

Environmental sensor threshold exceeded critical level (voltage, temperature)

Major

Environmental sensor threshold exceeded major level (voltage, temperature)

Info

Port administratively shut down.

Check LED Indicators

For more information about the LEDs and their description, see the LED Indicators section in the Overview chapter.