The interfaces support either DCE or DTE terminations depending on the type of cable connected to the interface. The synchronous serial port adapter depicted in Figure 2.44 is available on the Cisco 7500, 7000 and 7200 series routers.
Bandwidth for many installation is a valuable asset. Compressing data prior to transmission enables routers to transmit fore information than would be allowed without compression. The Compression Service adapters off-load compression and decompression functions from the host processor for inbound and outbound traffic over channelized E1/ISDN PRI, channelized T1/ISDN PRI, BRI ISDN and synchronous serial port adapters. Figure 2.50 diagrams the two models for the compression service adapters.
- Single Port Molex 200-pin receptacle The Molex 200-pin receptacle supports a wide variety of synchronous serial interfaces. Each Molex receptacle interface provides up to eight synchronous serial interfaces using a special cable designed for supporting the desired electrical interface specification. The Molex runs full-duplex mode supporting either 1.544 Mbps (T1) or 2.048 Mbps (E1) speeds for V.35 and X.21 interfaces. Support for EIA/TIA-232 interfaces allows up to eight ports operating full-duplex mode at 64 Kbps. Figure 2.45 illustrates the 200-pin Molex receptacle. These port adapters are available on the 7x00 family of routers.
- Synchronous Serial E1-G.703/G.704 The E1-G.703/G.704 serial interface is an International Telecommunication Union Telecommunication (ITU-T) standard for serial line speeds of 2.048 Mbps on E1 lease lines. The port adapter supports up to four synchronous serial interfaces framed and unframed service. The interfaces are ordered with eight unbalanced 75-ohm or balanced 120-ohm. Figure 2.46 diagrams the Synchronous Serial E1-G.703/G.704 port adapter.
- Token Ring The Token Ring port adapter provides up to four IEEE 802.5 token ring interfaces at either 4 or 16 Mbps. The port adapter is available on the 7x00 family of routers and comes in two models. A half-duplex and full-duplex model. The full-duplex model realizes an aggregate speed of 32 Mbps. Figure 2.47 illustrates the token ring port adapter.
- FDDI The FDDI port adapter comes in two flavors: half-duplex and full-duplex. Each of these flavors is available with two multimode or single-mode interfaces at a maximum bandwidth of 100 Mbps per port. Each port adapter supports the optical bypass switching capability. Figure 2.48 diagrams the single and multimode FDDI port adapters. The full-duplex option enables the FDDI port adapter to realize and aggregate speed of 200 Mbps per port. The FDDI port adapters are available for all the Cisco 7x00 family of routers.
- HSSI HSSI port adapters are configurable with either one or two HSSI interfaces. Each interface uses the EIA/TIA 612/613 high speed standard to provide T3 (45 Mbps), E3 (34 Mbps) and SONET STS-1 (51.82 Mbps) data rates. Figure 2.49 illustrates the HSSI port adapter which is available on all Cisco 7x00 routers.
- Compression Service Adapter
The first model has 786 KB of memory enabling it to handle compression/decompression for up to 64 WAN links. The second model is configured with 3 MB of memory in support of 256 WAN links. Both models of the compression service adapter are available on the entire Cisco 7x00 family of routers.
The Cisco 4x00 router platform is based on the use of network processor modules (NPM). Using the NPMs a 4x00 router can combine many different types of interface connections in support of various networking requirements. The 4x00 series router platform is available in three models. Each model looks identical as depicted in Figure 2.51, with different interface support and processing power. The models 4000-M, 4500-M and 4700-M can mix and match the NPMs using the three available slots. The low-end 4000-M model supports the following NPMs:
- 4000 Series
- Token Ring
- ISDN BRI
- Channelized E1/T1 ISDN PRI