Cisco ASR 903 Installation Guide

1PPS (input and output)10 Mhz (input and output)
40 nanosecondsInput—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 28: 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 character—GND5
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
To avoid surge failure on the 1PPS and 10MHz ports on a A900-RSP2A RSP, while using cables exceeding
2m, an external surge protector must be installed.
Note
Table 29: RJ48 IPPS/ToD Port Pinout
DescriptionDirectionSignal NamePin
V.11 Cable CorporationOutput or InputRESERVED1
Output or InputRESERVED2
1PPS RS422 signal
Output1PPS_N3
Cisco ASR 903 and ASR 903U Aggregation Services Router Hardware Installation Guide
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Troubleshooting
Time of Day Port Pinout

Cisco ASR 903 Specifications

General

Brand	Cisco
Model	ASR 903
Category	Network Router
Language	English