3com S330 User Manual
6
C
HAPTER
1: S
YSTEM
D
ESCRIPTION
The following optional modules are available for use with the PathBuilder S310:
n
The two-port CBR module services traffic generated by your existing PBXs,
channels, T1/E1 multiplexers, CSU/DSUs, and video conferencing devices. The
CBR module consists of one V.35/RS-449 and one T1-DSX or E1 interface,
which support both structured and unstructured services, in accordance with
the ATM Forum’s Circuit Emulation Service (CES) specifications. The CBR
module provides a smooth migration from legacy CBR service (PBX/voice/video)
to ATM service. It also supports all relevant ATM and T1/E1 standards, ensuring
easy integration of existing equipment into new ATM networks.
channels, T1/E1 multiplexers, CSU/DSUs, and video conferencing devices. The
CBR module consists of one V.35/RS-449 and one T1-DSX or E1 interface,
which support both structured and unstructured services, in accordance with
the ATM Forum’s Circuit Emulation Service (CES) specifications. The CBR
module provides a smooth migration from legacy CBR service (PBX/voice/video)
to ATM service. It also supports all relevant ATM and T1/E1 standards, ensuring
easy integration of existing equipment into new ATM networks.
n
The one-port Voice Compression module (VCM) is similar in function to the CBR
module, but it employs compression algorithms that allow more voice calls to
be placed through the same bandwidth. The VCM’s T1-DSX/E1 interface
connects to a PBX trunk, which may use CAS or CCS signaling. Its 24/31 DSO
channels can carry individual voice, fax, modem, or data connections. You can
also bundle multiple DSOs to provide connections for high-rate applications
such as video conference or multiple-link PPP. For CCS, a DSO is used as an
ISDN D-channel for carrying signal messages.
module, but it employs compression algorithms that allow more voice calls to
be placed through the same bandwidth. The VCM’s T1-DSX/E1 interface
connects to a PBX trunk, which may use CAS or CCS signaling. Its 24/31 DSO
channels can carry individual voice, fax, modem, or data connections. You can
also bundle multiple DSOs to provide connections for high-rate applications
such as video conference or multiple-link PPP. For CCS, a DSO is used as an
ISDN D-channel for carrying signal messages.
Figure 2 shows the PathBuilder S310, with the optional CBR module installed in
expansion slot 7 and the Voice Compression module in slot 8.
expansion slot 7 and the Voice Compression module in slot 8.
Figure 2 PathBuilder S310 WAN Access Switch
T1-DSX/E1
T1-DSX/E1
V.35/
RS-449/
RS-530/
X.21
RS-449/
RS-530/
X.21
Video/Audio
Codec
RS-366
PBX
PBX
LAN
NMS Console
RS-232
Router
T1/E1
10BASE-T
V.35/
RS-449/
RS-530/
X.21
RS-449/
RS-530/
X.21