Download the ALC Timing Services brochure.

Technical Information
GPS Time Feed
Distance between redundant antennae is approximately
4 metres.
GPS signal is L1 1575.42 MHz. Meinberg receivers
require an adaptor.
Total propagation delay is the sum of:
1) Delay as measured at the ALC GPS distribution
switch: 447ns.
2) Delay due to cabling (installed to required length)
from the customer distribution point to customer
cabinet: 4ns per metre of cable.
3) Delay through a signal booster (if required): 9ns
FIXED CONFIGURATION
PTP protocol
Physical interface
Port Capacity
CUSTOMER VARIABLE CONFIGURATION (PER PORT)
Delay Mechanism
Mode
Announce Interval*
Sync Interval*
Minimum delay request internal*
Minimum peer delay request interval*
Time to live (TTL)
Domain
Transport protocol
IP address (including netmask & default gateway)
* Configurable in whole powers of 2.
Example 1
Customer installation with 42m of cable, no signal
booster:
Delay: 447ns + (42 x 4ns) = 615ns
Example 2
Customer installation with 80m of cable, with signal
booster:
Delay: 447ns + (80 x 4ns) + 9ns = 776ns
ASX Matching Engine Time Synch
The PTP timeservers are driven by a Rubidium-stabilised
Symmetricom S350 timeserver.
PTP timing is provided by a Master Clock PTP option
card housed in a Spectracom SecureSync time server.
Matching engine time is within 150µs of GPS time.
PTPv2
a.k.a. IEEE 1588-2008
10/100 Mb Ethernet, RJ45 copper
Sync rate above 512 syncs/sec
End to end (default), peer to peer, or disabled
Ordinary clock (master) 2 step (default) or 1 step operation
2 seconds (default)
1 second (default)
16 seconds (default)
1 second (default)
1 (default)
0 (default)
Layer 3 (IPv4) (default) or Layer 2 (802.3/Ethernet)
Static or DHCP (from customer DHCP server)
ASX TECHNICAL SERVICES
Further Information
Andrew Biggart
Presales – Technical Services
+61 2 9227 0025
andrew.biggart@asx.com.au
ASX Information & Technical Services
Account Management
InfoandTechServices@asx.com.au
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