R31DS0087EU0101 Rev.1.01

Page 24

Sep.28.21

pcm4l Datasheet

To run a command, enter the command code and follow the prompt message. The following example shows “Set

Holdover Type” (command code 05) and “Get Holdover Type” (command code 04) command:

>06

Set Holdover Type:

Holdover Type? (Software = 0, 1 = Hardware): 0

Sending Command 6, E_cmnMngApi_SetHoldoverType

Waiting for response from server

Server responded with command 6, E_cmnMngApi_SetHoldoverType

>05

Get Holdover Type:

Sending Command 5, E_cmnMngApi_GetHoldoverType

Waiting for response from server

Server responded with command 5, E_cmnMngApi_GetHoldoverType

The Holdover Type is Software

>

5. ITU-T Equipment Clock Compliances

The following performance results use ptp4l as the PTP protocol stack along with pcm4l. All tests were completed

with Paragon-NEO, unless otherwise stated.

5.1 Noise Generation

Table 13. Noise Generation[1]

1. Measured on Xilinx ZCU111 + ClockMatrix 8A34001E FMC running pcm4l v4.1 and ptp4l v3.0.

Symbol

Parameter

Test Conditions

Minimum

Typical

Maximum

Unit

max|TEL|

Maximum absolute time error low-

pass filtered[2]

2. Measured under constant temperature (within ±1 K) and using a first-order low-pass measurement filter with a bandwidth of 0.1Hz for a

minimum of 10,000 seconds.

WritePhase mode

(with physical layer

assistance per G.8273.2)

-

3.7

5[3]

3. ITU-T G.8273.2 Class D.

ns

AdaptiveTime mode (no

physical layer

assistance)[4]

4. Using an ITU-T G.8263 compliant oscillator.See AN-807 Recommended Crystal Oscillators for Network Synchronization

-

47

-[5]

5. Still for further study at ITU-T.

ns

AssistedTime mode (with

local time reference)[6]

6. Locked to local time reference source (GNSS).

-

8

-[5]

ns

dTEL

Dynamic time error low-

pass filtered noise

generation[2]

MTIE

WritePhase mode

(with physical layer

assistance per G.8273.2)

-

0.24

3[7]

7. Provisional G.8273.2 Class D.

nspp

TDEV

-

0.04

1[7]

ns

Peak-

to-Peak

AdaptiveTime mode (no

physical layer

assistance)[4]

-

92

200

ns

Peak-

to-Peak

AssistedTime mode

(with local time

reference)[6]

-

6.3

50

ns