Справочник Пользователя для Lucent Technologies Release 8.2
Distributed Communications System
B
Private Networking
Administration for Network Connectivity
CID: 77730
555-233-504 — Issue 1 — April 2000
320
ISDN/X.25 gateway
DEFINITY ECS can serve as an interface between PBXs that support the D-channel
signaling feature and those that do not support this feature. The switch providing this
interface is known as the ISDN-DCS Gateway node and provides backward
compatibility to existing traditional DCS networks.
signaling feature and those that do not support this feature. The switch providing this
interface is known as the ISDN-DCS Gateway node and provides backward
compatibility to existing traditional DCS networks.
It maintains a mapping between processor channels and Administered NCA-TSCs.
When a DCS D-channel message arrives on an Administered NCA-TSC acting as a
gateway, it is converted to a traditional DCS message and sent out through the
processor channel that has been administered to map to this Administered NCA-TSC.
Likewise, when a traditional DCS message arrives at the gateway node on a processor
channel acting as a gateway, it is converted to a DCS D-channel message and sent out
through the Administered NCA-TSC that has been associated with this processor
channel on the ISDN Gateway Channel form.
When a DCS D-channel message arrives on an Administered NCA-TSC acting as a
gateway, it is converted to a traditional DCS message and sent out through the
processor channel that has been administered to map to this Administered NCA-TSC.
Likewise, when a traditional DCS message arrives at the gateway node on a processor
channel acting as a gateway, it is converted to a DCS D-channel message and sent out
through the Administered NCA-TSC that has been associated with this processor
channel on the ISDN Gateway Channel form.
In summary, a gateway is required whenever a transition is being made from BX.25
signaling to D-channel signaling. When the transition takes place at a switch that sits
between that part of the network that supports D-channel DCS and that part that does
not, that switch is an ISDN-DCS Gateway. A DCS network consisting entirely of
switches that support D-channel DCS never requires an ISDN-DCS Gateway because
none of the switches require “translation” to/from BX.25.
signaling to D-channel signaling. When the transition takes place at a switch that sits
between that part of the network that supports D-channel DCS and that part that does
not, that switch is an ISDN-DCS Gateway. A DCS network consisting entirely of
switches that support D-channel DCS never requires an ISDN-DCS Gateway because
none of the switches require “translation” to/from BX.25.
DCS Over ISDN-PRI D-channel
DCS Over ISDN-PRI D-channel (DCS+) enhances DCS by allowing access to the
public network for DCS connectivity between DCS switch nodes. With this feature,
DCS features are no longer restricted to private facilities.
public network for DCS connectivity between DCS switch nodes. With this feature,
DCS features are no longer restricted to private facilities.
The ISDN-PRI B-channel is used for voice communications, and the ISDN-PRI
D-channel transports DCS control information. DCS Over ISDN-PRI utilizes the
Message-Associated User-to-User Information (MA-UUI) and Temporary Signaling
Connections (TSC) to transport certain DCS control information. MA-UUI allows
additional user-specific information to be transported along with certain ISDN
call-control messages.
D-channel transports DCS control information. DCS Over ISDN-PRI utilizes the
Message-Associated User-to-User Information (MA-UUI) and Temporary Signaling
Connections (TSC) to transport certain DCS control information. MA-UUI allows
additional user-specific information to be transported along with certain ISDN
call-control messages.
Note:
Use this feature only over DS1/E1 or T1 circuit packs that are
administered to Country Protocol Option 1, Protocol Version A
(even in a private network environment) independent of what
country the system is in.
administered to Country Protocol Option 1, Protocol Version A
(even in a private network environment) independent of what
country the system is in.