Cisco WS-X6066-SLB-APC - Content Switching Module Software Manual page 822

Understanding How a VoIP Network Works
Digital Trunk Gateway
The Catalyst 6000 family 8-port T1/E1 PSTN interface module is a high-density, eight port, T1/E1 VoIP
module that can support both digital T1/E1 connectivity to the PSTN or transcoding and conferencing.
The module requires an IP address, is registered with Cisco CallManager in its domain, and is managed
by Cisco CallManager.
The module software is downloaded from a TFTP server. Depending upon which software you
download, the ports can serve as T1/E1 interfaces or the ports support transcoding and conferencing.
Transcoding and conferencing functions are mutually exclusive. For every transcoding port in use, one
less conferencing port is available and vice versa.
To configure the 8-port T1/E1 PSTN interfaces, see the
page
The 8-port T1/E1 PSTN interface module features are listed in
Table 44-2 8-Port T1/E1 PSTN Interface Module Features
Digital Signal Processing Per T1/E1 Port
G.711 to G.723 and G.729a transcoding (maximum of 8 x 32 channels of transcoding)
Conference bridging, meet-me and ad-hoc conference modes (maximum of 8 x 16 channels of
conferencing)
Comfort noise generation
Fax passthrough
Silence suppression, voice activity detection
Line echo cancellation
Common channel signaling
For T1: 23 DS0 channels for voice traffic; 24th channel is used for signaling
For E1: 29 DS0 channels for voice traffic; 16th channel is reserved for signaling
Any channel can be configured for common channel signaling
ISDN Primary Rate Interface signaling: Each interface supports 23 channels for T1 and 30 channels
for E1. The default mode is for the 24th T1 channel or 16th E1 channel to be reserved for signaling.
Both network side and user side operation modes are supported.
T1 binary 8-zero substitution/alternate mark inversion (B8ZS/AMI) line coding, u-law or a-law
coding
E1 HDB3 line coding
T1 line bit rate: 1.544 Mbps
E1 line bit rate: 2.048 Mbps
T1 line code: AMI, B8ZS
E1 line code: HDB3
Framing format: D4 superframe and extended superframe
Link Management
FDL
1. FDL = Facilities Data Link
Catalyst 6000 Family Software Configuration Guide—Releases 6.3 and 6.4
44-6
44-9.
1 is a link management protocol used to help diagnose problems and gather statistics on T1 lines
Chapter 44 Configuring a VoIP Network
"Configuring VoIP on a Switch" section on
Table 44-2.
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