
Configuring Line Services
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HSSI Overview
The High-Speed Serial Interface (HSSI) provides a high-speed interface
supporting bandwidth-intensive applications, such as host-to-host links, disaster
recovery, and image processing. HSSI eliminates the typical bottleneck created by
differences between LAN and WAN speeds.
The HSSI interface supports full-duplex synchronous bit rates from 300 Kb/s
through to 52 Mb/s. HSSI provides connection to high-speed circuits such as
T3/ES and SONET OC-1, and to high-speed WAN switching services including
Frame Relay, SMDS, and ATM DXI.
HSSI link module also supports a remote line loopback mechanism to test circuit
integrity. The DSU (DCE) signals and requests a loopback from the router (data
terminal equipment or DTE) to check the DTE-to-DCE connection. This loopback
test speeds failure isolation and enhances network reliability.
ISDN Overview
Integrated Services Digital Network (ISDN) Basic Rate Interface (BRI) interface
is an IEEE 802.9-compliant interface that allows an access node (AN, ASN, or
ARN) to be directly connected to an ISDN switched services network. This
interface eliminates the need for an external ISDN terminal adapter (TA) when
attaching to an ISDN network. The ISDN BRI provides two 64-Kb/s B-channels
for data and one 16-Kb/s D-channel for signaling.
ISDN Primary Rate Interface (PRI) software interface connects a BLN and BCN
directly to an ISDN switched service network via a Bay Networks Multichannel
T1 (MCT1) or Multichannel E1 (MCE1) link module. Like the ISDN BRI, this
interface eliminates the need for an external ISDN adapter when attaching a Bay
Networks router to an ISDN network.
ISDN PRI can connect to up to 30 remote locations over an ISDN switched
network and complies with the North American and European ISDN PRI
standards. The North American standard provides 23 B-channels of 64 Kb/s each
and one 64 Kb/s D-channel. The European standard provides 30 B-channels plus
one D-channel.
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