Cisco Systems IPMUX-1E operation manual Isdn BRI, Ethernet Ports

Chapter 1 Introduction IPmux-1/1EInstallation and Operation Manual

ISDN BRI

IPmux-1E has 4-ports, S-interface only. Each port can be configured as either NT or TE (Network/User) by jumper and software; NT or TE is configured per device.

IPmux-1E can be configured to 1, 2, 3 or 4 active ports.

IPmux-1E works in transparent mode (no termination/compression of the BRI “D” channels). It operates opposite a Megaplex unit, as a concentrator in transparent mode, or opposite another IPmux-1E with ISDN BRI ports.

FXS/FXO/E&M

IPmux-1E has 4 FXS/FXO/E&M interface ports for POTS connection. An IPmux unit with an E1/T1 CAS interface can groom FXS/FXO/E&M channels from the remote sites. IPmux-1E analog options interwork with Megaplex analog and E1/T1 modules via the Megaplex TDMoIP main link (ML-IP)

IP

The data stream coming from the E1 or T1 port is converted into IP packets that are transported over the Fast Ethernet port, and vice versa.

TDM bytes are encapsulated in a UDP frame that runs over IP and over Ethernet.

The number of TDM bytes in an IP frame is configurable for throughput/delay tradeoff.

Each device has a single IP address (Host IP). A configurable destination IP address is assigned to the IP packets. IP ToS field support can be configured for IP Level Priority. In Redundancy Mode, a secondary IP Address is used for the backup bundle; this device IP Address defines a response for a ping, but not for management.

Ethernet Ports

IPmux-1/1E is available with two Ethernet ports (user and network ports). The optional user Ethernet port is used for user LAN connectivity/access, in addition to the TDM service connectivity.

The Ethernet ports work in either transparent bridge mode or in a second mode that enables user port rate limiting.

The Ethernet network port can be either UTP or fiber. The Ethernet user port is UTP only.

•Fiber option – standard 100BaseFx full-duplex port (see Table 1-1).

•UTP option – A standard 10/100BaseT half/full-duplex port with auto-negotiation support. If auto-negotiation is disabled, Ethernet mode should be configured.

Note Half-duplex operation in the IPmux-1/1E network port is not recommended, because collisions and backoffs cause large delay variation and may exceed the delay variation buffer tolerance at the receiving end, causing buffer underflows and errors to occur.

1-6 Overview