Cambium PTP 670 Series, Руководство пользователя

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Chapter 3: System planning TDM network planning
Page 3-53
TDM network planning
This section describes factors to be considered when planning PTP 670 TDM networks.
Caution
If the ODU port has negotiated a link at 100BASE-T, the NIDU will not send or receive
TDM data, and will not bridge customer data traffic. Ensure that the Ethernet drop
cable between the ODU and the PSU, and the network cable between the PSU and the
NIDU, will reliably support operation at 1000BASE-T.
Note
TDM operation is not supported in the HCMP topology.
The NIDU TDM ports conform to the specifications listed in
Table 71 .
Table 71 PTP 670 TDM interface specifications (if NIDU installed)
TDM Bridging Specification
TDM ports 8 E1 or 8 T1
ITU-T Recommendation G.703 (10/1998) – Series G:
“Transmission Systems and Media, Digital Systems and
Networks; “Physical/electrical characteristics of hierarchical
digital Interfaces”.
Timing ITU-T Recommendation G.823 (03/2000) – Series G:
“Transmission Systems and Media, Digital Systems and
Networks; The control of jitter and wander within digital
networks which are based on the 2048 kbits/s hierarchy”.
ITU-T Recommendation G.824 (03/2000) – Series G:
“Transmission Systems and Media, Digital Systems and
Networks; The control of jitter and wander within digital
networks which are based on the 1544 kbit/s hierarchy”.
Ethernet IEEE 802.3 2012 – IEEE Standard for Information technology –
Telecommunications and information – exchange between
systems – Local and metropolitan area networks – Specific
requirements.
Line coding AMI, B8ZS/HDB3
Line resistance 100 / 120 Ohm
E1/T1 latency (one way) Typically 1 to 3 ms depending on range, bandwidth,
modulation mode and number of E1/T1 port.
Use LINKPlanner to calculate E1/T1 latency.