sync-if-timing
config>system
This command creates or edits the context to create or modify timing reference parameters.
not enabled (The ref-order must be specified in order for this command to be enabled.)
abort
config>system>sync-if-timing
This command is required to discard changes that have been made to the synchronous interface timing configuration during a session.
begin
config>system>sync-if-timing
This command is required to enter the mode to create or edit the system synchronous interface timing configuration.
bits
config>system>sync-if-timing
This command enables the context to configure parameters for BITS timing on the 7705 SAR-18. The BITS input and output ports can be configured for T1/E1 or 2 MHz G.703 signals.
input
config>system>sync-if-timing>bits
This command enables the context to configure BITS input timing ports parameters on the 7705 SAR-18.
interface-type {ds1 [{esf | sf}] | e1 [{pcm30crc | pcm31crc}] | 2048khz-G703}
no interface-type
config>system>sync-if-timing>bits
This command specifies the signal type for the BITS input and output ports. If you configure the signal type as ds1, the system automatically defaults to esf. If you configure the signal type as e1, the system automatically defaults to pcm30crc.
The no form of the command reverts to the default configuration.
ds1 esf
specifies Extended Super Frame (ESF). ESF is a framing type used on DS1 circuits. ESF consists of 24 192-bit frames. The 193rd bit provides timing and other functions.
specifies Super Frame (SF), also called D4 framing. SF is a common framing type used on DS1 circuits. SF consists of 12 192-bit frames. The 193rd bit provides error checking and other functions. ESF supersedes SF.
specifies PCM30CRC as the pulse code modulation (PCM) type. PCM30CRC uses PCM to separate the signal into 30 user channels with Cyclic Redundancy Check (CRC) protection.
specifies PCM31CRC as the PCM type. PCM31CRC uses PCM to separate the signal into 31 user channels with CRC protection.
output
config>system>sync-if-timing>bits
This command enables the context to configure BITS output port parameters on the 7705 SAR-18.
line-length {110 | 220 | 330 | 440 | 550 | 660}
config>system>sync-if-timing>bits>output
This command configures the line length, in feet, between the network element and the central clock (BITS/SSU).
This command is only applicable when the interface-type is DS1.
110
specifies a line length from 0 to 110 ft
specifies a line length from 111 to 220 ft
specifies a line length from 221 to 330 ft
specifies a line length from 331 to 440 ft
specifies a line length from 441 to 550 ft
specifies a line length from 551 to 660 ft
source {line-ref | internal-clock}
config>system>sync-if-timing>bits>output
This command configures the source of the BITS output ports in the 7705 SAR-18.
By default the source is configured as internal-clock, which provides a filtered signal from the output of the node’s central clock. The central clock output is usually used when no BITS/SASE device is present. When an external BITS/SASE clock is present, it is often desirable to provide an unfiltered clock reference to it by configuring line-ref. When the line-ref parameter is configured, the recovered clock from ref1 or ref2 (based on configuration of the ref-order and ql-selection commands) is transmitted directly out the BITS output port without filtering.
internal-clock
BITS output timing is selected from one of the input references, without any filtering
BITS output timing is driven from the node's central clock (filtered)
ql-override {prs | stu | st2 | tnc | st3e | st3 | smc | prc | ssu-a | ssu-b | sec | eec1 | eec2}
no ql-override
config>system>sync-if-timing>external
config>system>sync-if-timing>bits
config>system>sync-if-timing>ref1
config>system>sync-if-timing>ref2
This command configures a static quality level value. This value overrides any dynamic quality level value received by the Synchronization Status Messaging (SSM) process.
no ql-override (for external timing references, ql-override stu is equivalent to no ql-override)
SONET Primary Reference Source Traceable
SONET Synchronous Traceability Unknown
SONET Stratum 2 Traceable
SONET Transit Node Clock Traceable
SONET Stratum 3E Traceable
SONET Stratum 3 Traceable
SONET Minimum Clock Traceable
SDH Primary Reference Clock Traceable
SDH Primary Level Synchronization Supply Unit Traceable
SDH Second Level Synchronization Supply Unit Traceable
SDH Synchronous Equipment Clock Traceable
Ethernet Equipment Clock Option 1 Traceable (SDH)
Ethernet Equipment Clock Option 2 Traceable (SONET)
ssm-bit sa-bit
config>system>sync-if-timing>bits
This command configures which Sa-bit to use for conveying Synchronization Status Messaging (SSM) information when the interface type is E1.
Sa8
specifies the Sa-bit value
commit
config>system>sync-if-timing
This command is required to save the changes made to the system synchronous interface timing configuration.
external
config>system>sync-if-timing
This command enables the context to configure parameters for external timing via the port on the CSM. This can be used to reference external synchronization signals.
input-interface
config>system>sync-if-timing>external
This command enables the context to configure parameters for external input timing interface via the port on the CSM.
impedance {high-impedance | 50-Ohm | 75-Ohm}
config>system>sync-if-timing>external>input-interface
This command configures the impedance of the external input timing port. The command is only applicable to the 7705 SAR-8 Shelf V2, 7705 SAR-H, and 7705 SAR-M.
50-Ohm
specifies a high input impedance value
specifies a 50 Ω input impedance value
specifies a 75 Ω input impedance value
type {2048khz-G703 | 5mhz | 10mhz}
no type
config>system>sync-if-timing>external>input-interface
config>system>sync-if-timing>external>output-interface
This command configures the interface type of the external timing port.
The no form of the command reverts to the default.
2048 kHz-G703
specifies a G703 2048 kHz clock
specifies a 5 MHz sine clock
specifies a 10 MHz sine clock
output-interface
config>system>sync-if-timing>external
This command enables the context to configure parameters for external output timing interface via the port on the CSM.
n/a
[no] ql-selection
config>system>sync-if-timing
This command enables SSM encoding as a means of timing reference selection.
no ql-selection
ref-order first second [third]
no ref-order
config>system>sync-if-timing
The synchronous equipment timing subsystem can lock to three different timing reference inputs, those specified in the ref1, ref2, external, and bits command configuration. This command organizes the priority order of the timing references.
If a reference source is disabled, then the clock from the next reference source as defined by ref-order is used. If the reference sources are disabled, then clocking is derived from a local oscillator.
If a sync-if-timing reference is linked to a source port that is operationally down, the port is no longer be qualified as a valid reference.
For unfiltered BITS output (T4), all reference sources are valid options, except the BITS input, which is excluded to avoid a timing loop. Because the same priority order is used for the SETG output (T0), the BITS input option must be set as the first (highest-priority) reference option.
The no form of the command resets the reference order to the default values.
external, ref1 ref2
specifies the first timing reference to use in the reference order sequence
specifies the second timing reference to use in the reference order sequence
specifies the third timing reference to use in the reference order sequence
ref1
config>system>sync-if-timing
This command enables the context to configure parameters for the first timing reference.
ref2
config>system>sync-if-timing
This command enables the context to configure parameters for the second timing reference.
source-port port-id [adaptive]
no source-port
config>system>sync-if-timing>ref1
config>system>sync-if-timing>ref2
This command configures the source port for timing reference ref1 or ref2.
The timing reference can either be timing extracted from the receive port (line-timed) or packetized data of a TDM PW (adaptive). If the adaptive option is not selected, the system uses line timing mode. If the line timing is from a port that becomes unavailable or the link goes down, then the reference sources are re-evaluated according to the reference order configured by the ref-order command.
Line timing is supported on T1/E1 ports of the 7705 SAR-M and 7705 SAR-A and on the T1/E1 ports of the 7705 SAR-H 4-port T1/E1 and RS-232 Combination module.
Line timing is also supported in the form of synchronous Ethernet on all RJ-45 and optical SFP Ethernet ports on the 7705 SAR-M, 7705 SAR-H, 7705 SAR-Hc, 7705 SAR-Wx, 7705 SAR-X, and 7705 SAR-Ax. The 7705 SAR-A supports line timing on its synchronous Ethernet-capable ports (1 to 8) when they are fixed RJ-45 or optical SFP.
In addition, line timing is supported on the following modules:
2-port 10GigE (Ethernet) module
6-port SAR-M Ethernet module
4-port SAR-H Fast Ethernet module
On the 7705 SAR-8 Shelf V2 or 7705 SAR-18, line timing is supported on:
T1/E1 ports on the 16-port T1/E1 ASAP Adapter card and 32-port T1/E1 ASAP Adapter card
Ethernet SFP ports with SFPs that support synchronous Ethernet on the 6-port Ethernet 10Gbps Adapter card, 8-port Gigabit Ethernet Adapter card, Packet Microwave Adapter card, 2-port 10GigE (Ethernet) Adapter card, and 10-port 1GigE/1-port 10GigE X-Adapter card (supported on the 7705 SAR-18 only)
SONET/SDH ports on the 4-port OC3/STM1 Clear Channel Adapter card and 2-port OC3/STM1 Channelized Adapter card
DS3/E3 ports on the 4-port DS3/E3 Adapter card
Adaptive timing is supported on the T1/E1 ports on the 7705 SAR-X, 7705 SAR-M, and 7705 SAR-A. On the 7705 SAR-8 Shelf V2 and 7705 SAR-18, adaptive timing is supported on the 16-port T1/E1 ASAP Adapter card and the 32-port T1/E1 ASAP Adapter card configured with one or more TDM PWs. Adaptive timing is also supported on the T1/E1 ports of the 4-port T1/E1 and RS-232 Combination module.
Synchronous Ethernet ports can supply a timing reference on the 7705 SAR-M, 7705 SAR-A, 7705 SAR-Ax, 7705 SAR-Wx, and 7705 SAR-X. Two T1/E1 ports can supply a timing reference on the 7705 SAR-X and on the 7705 SAR-M and 7705 SAR-A (variants with T1/E1 ports).
On the 7705 SAR-H and 7705 SAR-Hc, all RJ-45 Ethernet ports and SFP ports support synchronous Ethernet and can supply a timing reference to be used as a source of node synchronization. When the 4-port T1/E1 and RS-232 Combination module is installed in the 7705 SAR-H, a single T1/E1 port on the module can supply a timing reference.
When the 2-port 10GigE (Ethernet) module or 6-port SAR-M Ethernet module is installed in the 7705 SAR-M, the ports on the module can supply a timing reference.
The 7705 SAR-8 Shelf V2 and 7705 SAR-18 can receive one or two timing references depending on the port and card type supplying the reference. A timing reference can come from:
a single SONET/SDH port on the 4-port OC3/STM1 Clear Channel Adapter card
two DS3/E3 ports on the 4-port DS3/E3 Adapter card
two SONET/SDH ports on the 2-port OC3/STM1 Channelized Adapter card
two synchronous Ethernet ports on the 6-port Ethernet 10Gbps Adapter card, 8-port Gigabit Ethernet Adapter card, 10-port 1GigE/1-port 10GigE X-Adapter card (supported on the 7705 SAR-18 only), or 2-port 10GigE (Ethernet) Adapter card
two T1/E1 ports on the 16-port T1/E1 ASAP Adapter card or 32-port T1/E1 ASAP Adapter card. References must be from different framers; the framers each have eight ports and are grouped as ports 1 to 8, 9 to 16, 17 to 24, and 25 to 32.
two ports on the Packet Microwave Adapter card: on port 1 or 2, it could be a synchronous Ethernet or PCR-enabled port; on port 3 or 4, it could be a synchronous Ethernet (optical SFP only) or PCR-enabled port (copper-based SFP only); on ports 5 through 8, it could be a synchronous Ethernet (optical SFP only) port.
The no form of this command deletes the source port from the reference. An example of when the no form would be used is if the user wants to change the reference to a source IP interface to enable PTP. In this case, the user would first delete the PTP using the no source-port command, then configure the source IP interface using the source-ptp-clock command.
identifies the port in the slot/mda/port format
clock recovery is adaptive, instead of line-timed
source-ptp-clock clock-id
no source-ptp-clock
config>system>sync-if-timing>ref1
config>system>sync-if-timing>ref2
This command configures the reference source clock using the clock ID configured by the PTP clock command.
no source-ptp-clock
identifies the PTP clock to use as the reference source clock
[no] revert
config>system>sync-if-timing
This command allows the clock to revert to a higher-priority reference if the current reference goes offline or becomes unstable. With revertive switching enabled, the highest-priority valid timing reference is used. If a reference with a higher priority becomes valid, a reference switchover to that reference is initiated. If a failure on the current reference occurs, the next highest reference takes over. With non-revertive switching, the active reference always remains selected while it is valid, even if a higher-priority reference becomes available. If this reference becomes invalid, a reference switchover to a valid reference with the highest priority is initiated. When the failed reference becomes operational, it is eligible for selection.
no revert