Basic System Configuration Guide System Management
Edition: 01 3HE 11010 AAAC TQZZA 219
All DSL modules support Network Timing Reference (NTR). NTR is enabled
automatically with no user-configurable commands. The GPON port on the GPON
module also supports physical layer clock recovery via the downstream synchronous
GPON physical layer. Both NTR and GPON physical layer timing can be used as a
source of node synchronization.
The 7705 SAR-8 and 7705 SAR-18 can receive one or two timing references
depending on the port and card type supplying the reference. The 7705 SAR-8
supports two timing references only if a CSMv2 is installed. On the 7705 SAR-8 or
7705 SAR-18, a timing reference can come from:
• a single SONET/SDH port on the 4-port OC3/STM1 Clear Channel Adapter card
• a single synchronous Ethernet port on the 8-port Ethernet Adapter card, version
2
• a single T1/E1 port on the 16-port T1/E1 ASAP Adapter card, version 1 (not
supported on the 7705 SAR-18)
• 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 or
4-port OC3/STM1 / 1-port OC12/STM4 Adapter card
• two synchronous Ethernet ports on:
− the 6-port Ethernet 10Gbps Adapter card
− the 8-port Gigabit Ethernet Adapter card
− the 10-port 1GigE/1-port 10GigE X-Adapter card (not supported on the
7705 SAR-8)
− the 2-port 10GigE (Ethernet) Adapter card
• two T1/E1 ports on the 16-port T1/E1 ASAP Adapter card, version 2, or the
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 GNSS RF port on the GNSS Receiver card
The 7705 SAR-8 and 7705 SAR-18 can also use IEEE 1588v2 PTP as a source of
node synchronization.
Each T1/E1 port can be independently configured for loop-timing (recovered from an
Rx line) or node-timing (recovered from the SSU in the active CSM).
To Next Page
Loading...
