The SONET/SDH ETR chassis is the only available TDM satellite and can be configured for different modes. Table: Supported SONET/SDH satellite chassis lists the supported modes of the satellite chassis.
| Chassis type | Sat-type string |
|---|---|
4 port OC3 |
ts4-choc3-sfp |
4 port STM1 |
ts4-chstm1-sfp |
1 port OC12 |
ts1-choc12-sfp |
1 port STM4 |
ts1-chstm4-sfp |
The default type on a supplied TDM satellite is ts4-choc3-sfp. Updating to another type initiates a reboot of the satellite.
The TDM satellite provides CEM functionalities supported on the 7750 SR OC3/OC12 CES MDAs. The satellite is built using the same architecture as the 7705 SAR-8 adapter cards and is designed to transport existing TDM services including:
Cpipe service of DS1/E1 channels within SONET/SDH in structure-agnostic mode (SATOP) as described in RFC4553
MEF8 service of DS1/E1 channels within SONET/SDH in structure-agnostic mode
The following types of synchronization are supported:
DS1/E1 channels can be independently loop-timed, node-timed, or differentially-timed
OC3/STM1/OC12/STM4 ports can be node-timed
To provide a stable frequency from the host to the SONET/SDH satellite, ensure that the host's clock is referenced to a suitable timing source (for example, BITS) and configure Synchronous Ethernet from the host's Ethernet port connecting to the satellite. Copper Ethernet SFPs are not supported because they do not support Synchronous Ethernet.
The TDM satellite is entirely managed through a 7750 SR host system, such as 7750 SR, 7750 SR-a, or 7750 SR-e. As a satellite, no new IP address needs to be assigned. Services on the satellite are configured on the host in the same manner as any ports in a native MDA. The TDM satellite connects to the SR host using a Gigabit Ethernet link, thereby not occupying valuable slots space in the host system. APS is supported across satellites connecting to a single host.