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D-13
PacketStar
®
PSAX 2300 Multiservice Media Gateway User Guide
, Issue 1
Release 9.0.0
Appendix D PSAX Module Features
DS3, E3, and STS-1e Interface Modules
•
Line type: C-bit parity, M13
•
Loopback capability: local loop, line loop
•
Transmit clock: local timing, loop timing
•
Line buildout: short (0–133 feet), long (134–266)
3-Port Channelized DS3/STS-1e CES Module (23N03)
The 3-Port Channelized DS3/STS-1e CES module supports circuit emulation
services (CES) and primary rate interfaces (PRI) with processing power
required to handle 3
×
672 DS0s. Additionally, this module is software con-
figurable to function in either DS3 or STS-1e modes. This dual-mode capabil-
ity allows you to deliver channelized DS3 or STS-1e configurations while
maintaining inventory of a single module type.
The module’s three high-speed circuit emulation network interfaces operate
at Digital Signal Level 3 (DS3), with a line rate of 44.736 Mbps, or at Syn-
chronous Transport Signal Level 1e (STS-1e), with a line rate of 51.84 Mbps.
Each port is capable of supporting 28 channelized DS1 interfaces for circuit
emulation services.
Note:
This module provides HDLC controllers to support integrated ser-
vices digital network with primary rate interface service (PRI
ISDN) with 64 Kbps clear channel capability for the D-channel.
Each DS3 port on the module supports up to 64 of these channels.
This is consistent with the requirement for transporting and termi-
nating D-channels on PRI links.
Typically, this module is used to connect the Multiservice Media Gateway
system to a TDM voice switch or digital cross-connect device (DACS) via
three ports.
This module can be configured to provide N
×
64 Kbps (fractional DS1) struc-
tured circuit emulation service. When configured for DS1 circuit emulation
service, the module interfaces with TDM channelized DS1 circuits. It converts
the channelized digital signals (usually voice data) to ATM virtual channels
for transport to ATM interfaces via the backplane. By using structured (chan-
nelized) circuit emulation, the 3-Port Channelized DS3/STS-1e CES module
can adapt a maximum of 28 DS1 channels per port to ATM virtual channels
with individual VPIs and VCIs. Signaling bit transport is also provided, using
ATM Forum standards for channel-associated signaling (CAS).
You can connect this module to a device using 56 Kbps or 64 Kbps for service
transport, with 8 Kbps for robbed-bit signaling per DS0. With the 64 Kbps
"clear channel" capability, this module can be connected to a device using
ISDN primary rate interface (PRI) service. Because this structured circuit-
emulation service can be configured to use only a fraction of the time slots,
several independent emulated circuits can be configured to share one service
interface.
The channelized DS3 multiservice and CES modules support activating and
deactivating DS1 access network interface (ANI) in-line loopback codes
embedded in the DS1 signal. These codes test transmissions between cus-
tomer interface equipment and network interface equipment, for example,
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