Cisco ASR 903 Hardware Installation Guide

1PPS (input and output)10 Mhz (input and output)
Input— > 2.4 volts TTL
compatible
Output— > 2.4 volts TTL
compatible
Input— > 1.7 volt p-p(+8 to +10
dBm)
Output— > 2.4 volts TTL
compatible
Amplitude
50 ohms50 ohmsImpedance
26 microseconds50% duty cyclePulse Width
40 nanoseconds
Input—AC coupled
Output—5 nanoseconds
Rise Time
Time of Day Port Pinout
The table below summarizes the ToD port pinout for ASR900-RSP1-55.
Table 20: RJ45 ToD Port Pinout
DescriptionDirectionSignal NamePin
1PPS RS422 signalOutput or Input1PPS_P1
1PPS RS422 signalOutput or Input1PPS_N2
Do NOT connectOutputRESERVED3
GND4
Time of Day characterGND5
Do NOT connectInputRESERVED6
Time of Day characterOutput or InputTOD_P7
Time of Day characterOutput or InputTOD_N8
The table below summarizes the TOD pinout for A900-RSP2A and A900-RSP3-3C-400 modules.
This port requires the use of SHIELDED cable for GR-1089-core “Intra-Bldg lightning surge” protection.
RS422 interface is per industry standard EIA-422 /RS422 specification.
Note
Cisco ASR 903 Aggregation Services Router Hardware Installation Guide
147
Troubleshooting
Time of Day Port Pinout

Cisco ASR 903 Specifications

General

Brand	Cisco
Model	ASR 903
Category	Network Router
Language	English