MiTOP-E3/T3 is a TDM pseudowire (PW) access gateway extending E3/T3 services over packet-switched networks. Housed in a Small Form-Factor Pluggable (SFP) enclosure, it is designed for quick and simple insertion into any 100/1000BaseFx Ethernet port with an MSA-compatible socket. MiTOP-E3/T3 is a simple and cost-effective alternative to external, standalone gateways or conversion cards for each user device, saving on space, power consumption, cabling, and simplifying management.
Synchronization between TDM devices is maintained by deploying advanced clock distribution mechanisms. The clocking options are:
- Internal – the master clock source for the TDM circuit is the internal oscillator
- Loopback – the transmit clock for the TDM is derived from the E3/T3 port receive clock
- Adaptive – the clock for the TDM is recovered from the PSN.Clock recovery conforms to G.823 using G.8261-defined scenarios.
- Sync-E (Gigabit Ethernet only) –Synchronous Ethernet timing is received via PSN and used to create a locked TDM clock. This ensures both sides of the network work with the same clock source.
Jitter and wander of the recovered clock are maintained at levels that conform to G.823/G.824 traffic. For adaptive clock recovery, the recovered clock performance depends on the packet network characteristics.
The units can be managed using different ports and applications:
- Out-of-band via the I2C channel (of the SFP edge connector)
- Inband via the Ethernet port, using a Web browser.
To facilitate integration of a new device into an IP network, if no IP address has been manually configured, MiTOP-E3/T3 automatically requests one from the DHCP server upon booting.
Management traffic can run over a dedicated VLAN.
Application software can be downloaded to MiTOP-E3/T3 via:
- SFP-CA unit, using YMODEM protocol
- Central server, using TFTP.
The TDM port connects to any standard E3 or T3 device. E3 and T3 interfaces feature:
- HDB3 (E3) and B3ZS, AMI (T3) line codes
- M23, C-bit framing (T3).
MiTOP-E3/T3 is transparent to all signaling protocols.
Loss of E3 or T3 signal is propagated by sending an electrical LOS signal to the 100/1000BaseFx port, and is visually indicated by the LOS LED (red) turning on. This in turn can automatically turn off the LAN link. Turning on/off the packet link is user-configurable (enabled or disabled).