Chapter 3 Vism Functional Description; Tdm Line-Handling Function; Figure 3-1 Vism Detailed Functional Blocks - Cisco Voice Interworking Services (VISM) Installation And Configuration Manual

TDM Line-Handling Function

Figure 3-1 VISM Detailed Functional Blocks
T1/E1
Lines
TDM Line DS0
Handling Switch
TDM Line-Handling Function
The TDM line-handling function provides the physical layer interface to the T1/E1 lines and handles the
following features:
•
•
•
•
•
•
Outgoing traffic—in from the TDM network and out to the packet network—is processed by the T1/E1
framers where each DS0 is extracted from its DS1 stream and is routed by a DS0 switch to the
appropriate function. Bearer DS0s are routed to the bearer processing function. CCS signaling DS0s are
routed to the TDM signaling function.
Outgoing traffic—in from the packet network and out to the TDM network—is processed in the opposite
manner. The DS0s received from the ATM side are inserted into their respective DS1s and transmitted
over the appropriate line in the TDM network.
Cisco VISM Installation and Configuration Guide
3-2
User Inputs
(CLI, CWM, SNMP)
Embedded Management Functions
Signal backhaul xGCP (CAS), Q.931 (PRI) *
Signaling
CCS
CAS
Bearer
Processing
Framing
Line codes
Physical layer alarms and failures
Clocking
Loopbacks
Distinguishes between bearer and CCS signaling channels
Call setup/ teardown xGCP *
Connection Resource
Handling * Coordination *
CAS (AAL2, Type 3) **
CCS (AAL5) **
Bearer
ATM CPS
Packetization
(SAR)
(SSCS)
Release 3.0, Part Number OL-2521-01 Rev. D0, June 2004
Chapter 3 VISM Functional Description
To Call Agent *
SRCP *
Key:
* VoIP Switching and
Switched AAL2 PVC
modes only
** Trunking mode only
To ATM
Network