I believe I'm in a similar boat to you.
I've cabled the 1PPS and 10MHz connectors on the RSP to a GPS clock. (The connectors on the RSP-440 are DIN 1.0/2.3, not SMB). I've constructed two DB9-to-RJ45 connectors for the TOD, one for each possible polarity of the RS422 signal.
Our Tekron GPS clock is set to NMEA GPRMC mode, 9600, 8N1, and outputs a string in the form of: $GPRMC,114143.00,A,3506.7870,N,08513.9180,W,0.0,0.0,100915,0.0,E*43
However, it does not appear that the router sees or interprets the serial string. When I unplug either the 10MHz or 1PPS cables I get logs, but I never see any change when I unplug the TOD input.
Furthermore, the TOD input is marked as Do Not Use (DNU) and it never shows up in the freq sync selection:
RP/0/RSP0/CPU0:ROC#show frequency synchronization clock-interfaces location 0/RSP0/CPU0
...
Clock interface Sync2 (Up - GPS)
Assigned as input for selection
Wait-to-restore time 0 minutes
SSM supported
Input:
Up
Effective QL: DNU, Priority: 1, Time-of-day Priority 1
Supports frequency and time-of-day
Output is disabled
Next selection points: T0-SEL-B
RP/0/RSP0/CPU0:ROC#show freq synchronization selection location 0/RSP0/CPU0
...
Selection point: T0-SEL-B (1 inputs, 1 selected)
Last programmed 19:18:50 ago, and selection made 18:09:56 ago
Next selection points
SPA scoped : None
Node scoped : T4-SEL-C CHASSIS-TOD-SEL
Chassis scoped: LC_TX_SELECT
Router scoped : None
Uses frequency selection
Used for local line interface output
S Input Last Selection Point QL Pri Status
== ======================== ======================== ===== === ===========
1 Internal0 [0/RSP0/CPU0] n/a SEC 255 Freerun
Selection point: CHASSIS-TOD-SEL (1 inputs, 1 selected)
Last programmed 19:18:50 ago, and selection made 19:18:50 ago
Next selection points
SPA scoped : None
Node scoped : None
Chassis scoped: None
Router scoped : None
Uses time-of-day selection
S Input Last Selection Point Pri Time Status
== ======================== ======================== === ==== ===========
1 Internal0 [0/RSP0/CPU0] 0/RSP0/CPU0 T0-SEL-B 1 255 No Available
Am I correct that the serial TOD string is not being received?
Are there any verification or debug commands are available to troubleshoot the issue?
Where can I find a complete description of the Cisco TOD format to see if my clock can produce it?
Many thanks!
Stephen
Hi Thijs,
(continuing on the comment I posted on the PTP doc as a response)
all 3, 1pps, 10Mhz and rj45 need to be connected to the GPS receiver. Technically you can use the frequency only (from 10Mhz) but this is not a supported configuration and the DTI logic will wine about a missing TOD and raise an alarm for it.
I have an open request for this to allow frequency only from GPS: CSCun86423
Note that for the RJ45, only the RS422 is wired to the fpga (not the rs232) and you'll need to use pins 7/8 for that.
the 1pps/10Mhz are used for frequency only (clocking). If the clock is selected you can sync the DTI to that source and distribute it to all linecards and use it for synchronous ether clocking, stm-x clocking on the sip700 etc.
You can use 1588 to distribute the clock, or do it the old fashioned way to use the clock derived as TX and have the remote side take that is input, but that obviously that will degrade the stratum on every node.
The RJ45 is for the time of day. This is to set the system date/time clock, not freq. The interface is RS422. The time/day can be distributed via NTP or PTP/1588. NTPv4 is generally accurate enough. This is then via the regular NTP distribution by making this GPS synced device ntp master.
regards
xander