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In the Telecommunications book on Page 180. The answer is Yes it does have a fixed-length frame of 53 octets.
IP, Ethernet, Frame Relay, ...IP, Ethernet, Frame Relay, ...IP, Ethernet, Frame Relay, ...IP, Ethernet, Frame Relay, ...
show frame-relay map
Frame Relay is a packet-switching technology. It works by sending information in packets, which are called frames, through a shared frame-relay network.
Frame relay.
120
4
2
no
A means of providing access to the Frame Relay network over a DSL connection
Leading two octets of message digest: L, To enable the recipient to determine if the correct public key (k(A) e ) was used to decrypt the message digest for authentication, by comparing this plaintext copy of the first two octets with the first two octets of the decrypted digest. These octets also serve as a 16-bit frame-check sequence for the message, for authentication and error detection.
Both ATM and Frame Relay are ways to connect your local network router to an ISP