Network Interfaces and Equipment
Issue 5 January 1998 12-11555-230-024
Configuring your DEFINITY ECS with an alternate voice/data DS1 interface does
the following:
■Uses out-of-band signaling in which signaling information is multi plexed
onto one of the 64-kbps digital channels
■Permits end-to-end voice and digital data connections between DEFINITY
ECS switches
■Delivers 23 clear 64-kbps digital channels plus one signaling channel
multiplexed onto a 1.544-Mbps DS1 line with provisions for framing,
maintenance, and signaling
■Delivers 8-kbps timing and slip information for synchroni zation subsystem
■Supports ground-start and loop-start switch-central office, foreign
exchange, and Wide Area Telecommunications Service
(inbound/outbound) trunks, as well as direct inward dial trunks,
off-premise stations, and dedicated voice/data switch connections
DEFINITY ECS DS1 interface capabilities include support for Digital Multiplexed
Interface.
To achieve even greater benefits than those just listed, you can com bine DEFIN-
ITY ECS DS1 interfaces and ISDN-Primary Rate Interface to give you additional
capabilities. ISDN-Primary Rate Interface is a DS1-compatible direct-connec t
access service that links the intelligence in herent in the network with the intelli-
gence provided by your DEFINITY ECS.
For example, with ISDN-Primary Rate Interface, the Software Defined Data Net-
work service may be accessed. Software Defined Data Network provides virtual
private-line connectivity, via the switched network, for vo ice, data, and video
applications. Software Defined Data Network services complement the Softwar e
Defined Network voice services.
DEFINITY ECS delivers Automatic Restoration capability with Software Defi ned
Data Network, which restores disrupted connections between a ccess endpoints
(non-signaling trunk) and data endpoints (devices that connect the sw itch to
computers and data communications equipment). This re storation is achieved
within seconds of a service disruption so that critical data applications can
remain operational.
Stratum 3 Clock
Many companies have solved their communications ne twork needs by using
high-speed digital facilities. However, many have found th at standard synchroni-
zation timing systems are not accurate enough in these s ituations. Standard sys-
tems allow more slippage than is desirable for operations like high-speed bulk
data transfer. The result is bit and frame losses which lead to lost data.