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Cisco AS5850 STM-1 Termination Card
Cisco AS5850 provides the channelized STM-1 interface for high-density PSTN connectivity. The Cisco AS5850 STM-1 Termination
Card (Figure 5) provides a maximum of 1890 (1953 in SS7/IMT configuration) DS-0 channels (63 E1 interfaces) through a single STM-1
connection. This card is valuable to any customer who wishes to reduce the number of cables required to deliver 63 E1 (or 1953 channels)
and take advantage of lower tariffs associated with purchasing a single STM-1 circuit versus 63 individual E1 circuits.
Figure 5. Cisco AS5850 STM-1 Termination Card
The SDH/STM-1 trunk card is a high-density multiplexing/demultiplexing card that takes in an STM-1 pipe, used to transport up to 1890
(1953 in SS7/IMT configuration) DS-0 channels. Digital calls are terminated onboard the SDH/STM-1 trunk card on HDLC controllers.
There are 512 HDLC controllers, and each HDLC controller can be used for either a D channel or one digital call. The SDH/STM-1 trunk
card can terminate a maximum of 512 digital calls, less the number of D channels. For example, with 63 D channels allocated, 449 digital
calls can be terminated. Additional digital calls and analog modem-originated calls are passed over the TDM bus to an available modem
resource pool.
The physical layer interface for the SDH/STM-1 trunk card is a synchronous transport module (STM). Each SDH/STM-1 trunk card has
two 155-Mbps STM physical layer interfaces that allow 1 + 1 fiber protection. Each SDH/STM-1 trunk card has two LC small form-factor
type fiber receptacles to allow connection to single-mode optical fiber.
The SDH/STM-1 trunk card supports SDH MIB (RFC 1595), DS-1 MIB (RFC 1406), SNMPv1 agent (RFCs 1155–1157), and MIB II
(RFC 1213).
The SDH/STM-1 trunk card supports online insertion and removal (OIR), a feature that allows users to remove and replace trunk cards in
the Cisco AS5850 Universal Gateway while the system is operating, without disrupting other cards and their associated calls.
A test port is provided to test drop-and-insert testing on any DS-1/E1 from an external testing device, including monitoring of both
transmit and receive directions on any E1s with a built-in DS-1/E1 interface.
Cisco AS5850 324-Port DSP Cards
The Cisco AS5850 324-Port DSP Card (Figure 6) is a full-featured card that includes 324 DSP ports capable of terminating voice, modem,
fax, or ISDN. The DSP ports are fully consistent with the fully pooled model for DSP resources in the Cisco AS5850 Universal Gateway.
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